4x4 transmission
20-02-2011, 07:09 PM
#4
Ive tried to find someone else who has done and come up with nothing ! do you know someone ?
Mounting it is pretty simple really, just waiting for a piece of material to make a centre boss to fit the two together, then add the mountings.
I just need to have a cross shaft made then.
the trick(ier) bit is making it all work with the box, why has no one just made an adapter plate for the skyline box ? the clutch spigot shaft looks plenty long enough, though heat management and the starter would have to be looked closely at
20-02-2011, 07:15 PM
#6
How do you plan to get around the steering rack issue on the RHD cars?.
So your not planning to flip the diff to have it run in the standard rotation?
There was a brand new T5 4x4 box for sale recently on ebay, still crated from an MOD surplus company, used in some type of cross country military truck, I always thought they never got past the prototype stage.
So your not planning to flip the diff to have it run in the standard rotation?
There was a brand new T5 4x4 box for sale recently on ebay, still crated from an MOD surplus company, used in some type of cross country military truck, I always thought they never got past the prototype stage.
20-02-2011, 07:21 PM
#7
How do you plan to get around the steering rack issue on the RHD cars?.
So your not planning to flip the diff to have it run in the standard rotation?
There was a brand new T5 4x4 box for sale recently on ebay, still crated from an MOD surplus company, used in some type of cross country military truck, I always thought they never got past the prototype stage.
So your not planning to flip the diff to have it run in the standard rotation?
There was a brand new T5 4x4 box for sale recently on ebay, still crated from an MOD surplus company, used in some type of cross country military truck, I always thought they never got past the prototype stage.
running the diff over 180deg is not really an option as the pinion will starve of oil, that is unless you add a pump, if ther is no need to.
another problem with that to keep the prop flange in line means the centre line of the diff is alot higher, making the prop flange foul the gearbox, if you lower it then you end up with the drive shaft very low in the chassis, thus a biger can of worms to deal with !
Trending Topics
21-02-2011, 10:01 AM
#9
Tranny Man
Join Date: Mar 2010
Location: Inverinate NW Scotland
Posts: 62
Likes: 0
Received 0 Likes
on
0 Posts
Dave Howie has done the Skyline to Ford V6 Bellhousings see Fordpower.
Basically they machined / cut the 2 bellhousings and welded them together, if you look at his pics you can't see the join, the MT75 one and Skyline one fit together perfectly.
Re the diff, a good idea but there are some H/D motorsport ones about that dont sell for megabucks, also the strengthening plates and a tight build make a big difference
What torque are you running ???
For my 24V 4X4 Puma Stage Car I'm currently looking at ways to get a 50 / 50 split in an MT 75 Transfer, without buying the mega rare / expensive planet set. I may have a solution, though yet to be tested
Basically, remove the planet gears from the carrier, machine off its front half, so it becomes a flange with spline to engage mainshaft, then weld it to rear output shaft hub. By doing this, drive is locked to rear wheels, but front drive is transmitted thru viscous coupling, but front prop should get same torque application as the rear one. Viscous provides diff action and only locks up when rears spin a bit like a normal rear diff VC action........
LOL thats the theory, will have to wait until I try it on the stages later in the year to see if VC will put up with it. If not locking it all together is another option for the loose stuff, i.e 50 / 50 but no centre diff action.
Gonna use a stock torque split set up for tarmac anyway
See my post on torque split thread further down, have got some pics I'll put up if anyone's interested.
Cheers Dave
Basically they machined / cut the 2 bellhousings and welded them together, if you look at his pics you can't see the join, the MT75 one and Skyline one fit together perfectly.
Re the diff, a good idea but there are some H/D motorsport ones about that dont sell for megabucks, also the strengthening plates and a tight build make a big difference
What torque are you running ???
For my 24V 4X4 Puma Stage Car I'm currently looking at ways to get a 50 / 50 split in an MT 75 Transfer, without buying the mega rare / expensive planet set. I may have a solution, though yet to be tested
Basically, remove the planet gears from the carrier, machine off its front half, so it becomes a flange with spline to engage mainshaft, then weld it to rear output shaft hub. By doing this, drive is locked to rear wheels, but front drive is transmitted thru viscous coupling, but front prop should get same torque application as the rear one. Viscous provides diff action and only locks up when rears spin a bit like a normal rear diff VC action........
LOL thats the theory, will have to wait until I try it on the stages later in the year to see if VC will put up with it. If not locking it all together is another option for the loose stuff, i.e 50 / 50 but no centre diff action.
Gonna use a stock torque split set up for tarmac anyway
See my post on torque split thread further down, have got some pics I'll put up if anyone's interested.
Cheers Dave
21-02-2011, 03:13 PM
#11
hi mark looks interesting ,one point you probaly know when you turn the diff upside down the shafts will spin the opposite way ie will be trying to go backwards ,also wont you have one very short drive shaft which could pop out because of the movement in lengh it would need for suspension travel ,what is the reason behind the conversion is it to get a 7.5 inch front diff
thanks mark
thanks mark
21-02-2011, 05:10 PM
#12
Dave Howie has done the Skyline to Ford V6 Bellhousings see Fordpower.
Basically they machined / cut the 2 bellhousings and welded them together, if you look at his pics you can't see the join, the MT75 one and Skyline one fit together perfectly.
Re the diff, a good idea but there are some H/D motorsport ones about that dont sell for megabucks, also the strengthening plates and a tight build make a big difference
What torque are you running ???
For my 24V 4X4 Puma Stage Car I'm currently looking at ways to get a 50 / 50 split in an MT 75 Transfer, without buying the mega rare / expensive planet set. I may have a solution, though yet to be tested
Basically, remove the planet gears from the carrier, machine off its front half, so it becomes a flange with spline to engage mainshaft, then weld it to rear output shaft hub. By doing this, drive is locked to rear wheels, but front drive is transmitted thru viscous coupling, but front prop should get same torque application as the rear one. Viscous provides diff action and only locks up when rears spin a bit like a normal rear diff VC action........
LOL thats the theory, will have to wait until I try it on the stages later in the year to see if VC will put up with it. If not locking it all together is another option for the loose stuff, i.e 50 / 50 but no centre diff action.
Gonna use a stock torque split set up for tarmac anyway
See my post on torque split thread further down, have got some pics I'll put up if anyone's interested.
Cheers Dave
Basically they machined / cut the 2 bellhousings and welded them together, if you look at his pics you can't see the join, the MT75 one and Skyline one fit together perfectly.
Re the diff, a good idea but there are some H/D motorsport ones about that dont sell for megabucks, also the strengthening plates and a tight build make a big difference
What torque are you running ???
For my 24V 4X4 Puma Stage Car I'm currently looking at ways to get a 50 / 50 split in an MT 75 Transfer, without buying the mega rare / expensive planet set. I may have a solution, though yet to be tested
Basically, remove the planet gears from the carrier, machine off its front half, so it becomes a flange with spline to engage mainshaft, then weld it to rear output shaft hub. By doing this, drive is locked to rear wheels, but front drive is transmitted thru viscous coupling, but front prop should get same torque application as the rear one. Viscous provides diff action and only locks up when rears spin a bit like a normal rear diff VC action........
LOL thats the theory, will have to wait until I try it on the stages later in the year to see if VC will put up with it. If not locking it all together is another option for the loose stuff, i.e 50 / 50 but no centre diff action.
Gonna use a stock torque split set up for tarmac anyway
See my post on torque split thread further down, have got some pics I'll put up if anyone's interested.
Cheers Dave
as for your idea with the fixed planetaries, that would not work, you cannot rely on the vc to transmit drive across the chain (if i have read it right) the Vc only makes up the differance in speed between front and rear axles, its the sun/planetary gears that transmit the main drive.
hi mark looks interesting ,one point you probaly know when you turn the diff upside down the shafts will spin the opposite way ie will be trying to go backwards ,also wont you have one very short drive shaft which could pop out because of the movement in lengh it would need for suspension travel ,what is the reason behind the conversion is it to get a 7.5 inch front diff
thanks mark
thanks mark
Was outside your house last week !
yeh if you flip the diff upside down, then yes rotation changes, as it is, still in its correct plane just spun round to the front the rotation is correct for a front drive from the gearbox, and the reason, just still looking for 5.5K for the 8.5" lol
21-02-2011, 05:23 PM
#13
yeh ive seen the guys conversion for the V6, but i dont want to go down the welded bellhousing route, as if you need to change the box you then have a problem !
as for your idea with the fixed planetaries, that would not work, you cannot rely on the vc to transmit drive across the chain (if i have read it right) the Vc only makes up the differance in speed between front and rear axles, its the sun/planetary gears that transmit the main drive.
Hi Mark,
Was outside your house last week !
yeh if you flip the diff upside down, then yes rotation changes, as it is, still in its correct plane just spun round to the front the rotation is correct for a front drive from the gearbox, and the reason, just still looking for 5.5K for the 8.5" lol
as for your idea with the fixed planetaries, that would not work, you cannot rely on the vc to transmit drive across the chain (if i have read it right) the Vc only makes up the differance in speed between front and rear axles, its the sun/planetary gears that transmit the main drive.
Hi Mark,
Was outside your house last week !
yeh if you flip the diff upside down, then yes rotation changes, as it is, still in its correct plane just spun round to the front the rotation is correct for a front drive from the gearbox, and the reason, just still looking for 5.5K for the 8.5" lol
thanks mark
21-02-2011, 05:27 PM
#14
it was a sunday pal, dont like to bother people, and yes looking at what ive got, i reckon the shaft will be no shorter than the original std item, though my track is wider by a small amount so looks good at the moment.
will also be able to fit the 100mm lobro inside the chassis leg so clearance looks ok.
21-02-2011, 06:36 PM
#15
it was a sunday pal, dont like to bother people, and yes looking at what ive got, i reckon the shaft will be no shorter than the original std item, though my track is wider by a small amount so looks good at the moment.
will also be able to fit the 100mm lobro inside the chassis leg so clearance looks ok.
will also be able to fit the 100mm lobro inside the chassis leg so clearance looks ok.
sounds good mate ,if you need any machining or anything doing to help mock it up will help you out mark
thanks mark
14-03-2011, 11:02 PM
#22
I'm Finding My Feet Here Now
Join Date: Nov 2010
Location: Sunny Italy
Posts: 121
Likes: 0
Received 0 Likes
on
0 Posts
Not sure if rate of wear is the big issue, I'd be most concerned about how to actually mount the diff so the case doesn't distort especially under load. Doesn't take much distortion to give enough of a misalignment in the mesh for it to all break; this is the most common failure mode from what I can remember.
14-03-2011, 11:04 PM
#23
Not sure if rate of wear is the big issue, I'd be most concerned about how to actually mount the diff so the case doesn't distort especially under load. Doesn't take much distortion to give enough of a misalignment in the mesh for it to all break; this is the most common failure mode from what I can remember.
im not worried about that
15-03-2011, 08:18 AM
#24
Surely it will whine like hell, they are loud enough when reversing a car at 10 mph never mind 90 over second left crest
or whatever Tony Mason used to day.
Better off just spinning it so its in correct rotation and using an oil pump as belt and braces.
or whatever Tony Mason used to day.Better off just spinning it so its in correct rotation and using an oil pump as belt and braces.
15-03-2011, 09:10 AM
#26
edited
my error - getting my orientation mixed up with the front prop -spinning it will get the diff going in the right way but would be revering the car instead as the diff is facing the wrong way as you say.
I had the principal of spinning the diff mixed up with an idea I had a few years ago with rear mounting a YB but having the box facing forward, in that instance you need to spin the diffs to get forward motion through the gears and the gate would be unusual.
my error - getting my orientation mixed up with the front prop -spinning it will get the diff going in the right way but would be revering the car instead as the diff is facing the wrong way as you say.
I had the principal of spinning the diff mixed up with an idea I had a few years ago with rear mounting a YB but having the box facing forward, in that instance you need to spin the diffs to get forward motion through the gears and the gate would be unusual.
Last edited by PAUL S; 15-03-2011 at 09:54 AM.
15-03-2011, 09:32 PM
#27
I'm Finding My Feet Here Now
iTrader: (1)
Join Date: May 2004
Location: Chester
Posts: 131
Likes: 0
Received 0 Likes
on
0 Posts
I thought about doing this with my 200 rep a while ago too. but using the weak front diff upside down now as a rear diff it wouldnt have lasted long!
15-03-2011, 10:43 PM
#28
the cut on a hypoid gear set doesnt make any noise really so to speak, the noise you heard in reverse on most cars pre-1990 ish would be the straight cut gearset for reverse.
most manufacturers after 1990ish use helical and now with synchro.
06-05-2011, 11:05 PM
#29
I'm Finding My Feet Here Now
iTrader: (1)
Join Date: May 2004
Location: Chester
Posts: 131
Likes: 0
Received 0 Likes
on
0 Posts
Just had a brainwave while discussing 4wd-ing a TVR using a remote diff forward of the engine.....
That rear diff that you have next to the sump would work, But as has been said, its in the same orientation as the normal 6.5" front diff but, because its a rear diff it will be effectively running backwards (driving on the coast face of the hypoid gear and not the drive face).
In that case then, if you could get a crownwheel and pinion, that is 'reverse cut' (same way as the original 6.5" front diff) to fit that rear diff you have in the pic, then it'd be meshing correctly and there'd be no probs with the running in that direction.
It's a wild stab in the dark but, I'm assuming that the big front diffs such as an R&D 7.5" are cut this way as the crownwheel and pinion are in the same orientation for forward drive....
and even better if their CWP is based around the same dimensions as whats in the standard 7.5" rear diff/carrier/ cage etc but in their own case for bolting up to the sump?????
maybe give R&D a buzz to find out?
Cheers Pete
Last edited by evo200; 06-05-2011 at 11:46 PM.
07-05-2011, 04:35 PM
#31
Dave Howie has done the Skyline to Ford V6 Bellhousings see Fordpower.
Basically they machined / cut the 2 bellhousings and welded them together, if you look at his pics you can't see the join, the MT75 one and Skyline one fit together perfectly.
Re the diff, a good idea but there are some H/D motorsport ones about that dont sell for megabucks, also the strengthening plates and a tight build make a big difference
What torque are you running ???
For my 24V 4X4 Puma Stage Car I'm currently looking at ways to get a 50 / 50 split in an MT 75 Transfer, without buying the mega rare / expensive planet set. I may have a solution, though yet to be tested
Basically, remove the planet gears from the carrier, machine off its front half, so it becomes a flange with spline to engage mainshaft, then weld it to rear output shaft hub. By doing this, drive is locked to rear wheels, but front drive is transmitted thru viscous coupling, but front prop should get same torque application as the rear one. Viscous provides diff action and only locks up when rears spin a bit like a normal rear diff VC action........
LOL thats the theory, will have to wait until I try it on the stages later in the year to see if VC will put up with it. If not locking it all together is another option for the loose stuff, i.e 50 / 50 but no centre diff action.
Gonna use a stock torque split set up for tarmac anyway
See my post on torque split thread further down, have got some pics I'll put up if anyone's interested.
Cheers Dave
Basically they machined / cut the 2 bellhousings and welded them together, if you look at his pics you can't see the join, the MT75 one and Skyline one fit together perfectly.
Re the diff, a good idea but there are some H/D motorsport ones about that dont sell for megabucks, also the strengthening plates and a tight build make a big difference
What torque are you running ???
For my 24V 4X4 Puma Stage Car I'm currently looking at ways to get a 50 / 50 split in an MT 75 Transfer, without buying the mega rare / expensive planet set. I may have a solution, though yet to be tested
Basically, remove the planet gears from the carrier, machine off its front half, so it becomes a flange with spline to engage mainshaft, then weld it to rear output shaft hub. By doing this, drive is locked to rear wheels, but front drive is transmitted thru viscous coupling, but front prop should get same torque application as the rear one. Viscous provides diff action and only locks up when rears spin a bit like a normal rear diff VC action........
LOL thats the theory, will have to wait until I try it on the stages later in the year to see if VC will put up with it. If not locking it all together is another option for the loose stuff, i.e 50 / 50 but no centre diff action.
Gonna use a stock torque split set up for tarmac anyway
See my post on torque split thread further down, have got some pics I'll put up if anyone's interested.
Cheers Dave
when the rears start to spin faster than the fronts, then the vc keeps the front output shaft rotating at the same speed as the rear
it's like putting the drive into a diff via the driveshafts, as long as the other wheels is rotating at the same speed the prop will also carry on turning, but if one of the output shafts changes speeds the lsd bit will feed power the other way
the only way to stop this is to remove the viscous coupling of the equation altogether and weld that bit where it goes through the different sized cogs up so they don't rotate as this is whats giving you the torque multipilcation
08-05-2011, 07:56 AM
#33
But it's all in the same unit, so but removing the whole viscous boxset from the equation you'd still get 100% locked diff when you push the power through, but I'm not sure if this would reslut in the same 66/34 split of torque or if this is what would make it a 50/50 split as the gears inside do the splitting stuff being twice the size etc
19-05-2011, 11:36 PM
#36
just a thought, what about something like:
http://cgi.ebay.co.uk/TOYOTA-HILUX-2...item35ad7c024f
forget the diff lock and all that crap, just thought being jap and made for manly jobs, it may well be strong enough for this if you could make it fit?
http://cgi.ebay.co.uk/TOYOTA-HILUX-2...item35ad7c024f
forget the diff lock and all that crap, just thought being jap and made for manly jobs, it may well be strong enough for this if you could make it fit?
Thread
Thread Starter
Forum
Replies
Last Post
nicodinho
Ford Non RS / XR / ST parts for sale.
6
07-10-2015 12:56 PM
