i doubt anyone will be able to tell me this but its worth a try anyway

doing the box conversion for my track car, using the front half of a 4x4 mt75 and the back rwd half of a 2.0ltr sierra mt75.
now, went to put them together today and found the main shafts are different legnths

so does anyone know if i should

a) use the shorter 2.0ltr shaft (although it may not be long enough to reach the crank and support the clutch propperly)

or

b) use the 4x4 main shaft which is the right length..but the gear on the shaft has 1 extra tooth

or

c) pull the whole bloody lot apart and put all the gears from the 4x4 onto the 2wd shaft

 

fook knows that mate, but slightly changin subject lol, did you try fitting the bumper to your car?

i had a go yesterday and im not sure but it seems a little too wide for the car?

 

Just fit a T5, better ratios

Steve.

 

beat me to it!!

 

absolutly shite ratios for a v6 and the box is 3 times the price

 

really you sure your car aint shrunk mate if anything it should be a tad small not large as fibreglass has shrinkage of about 2%

 

well i didnt put the L shape mounting brackets on cos the bolts are M8 andthe one on the bumper are M10 and i didnt have a drill handy lol.

but if i held it up to the car i could get one side bolt in and not the other as it would pop off lol

i need another go tho after drilling out them brackets i reckon.


other than thats it looks ace cheers mate

 

hmmm well tbh the brackets are the only things that could be wrong unless that original bumper you gave me came from someone who had extended it to fit some max power car

 

Why do you think the ratios are bad ?

I have driven them with a type 9, T5 and the MT75 and found the best to be the T5.

1st, 2nd and 3rd are sooo much better

Steve.

 

calling Bernie

 

i emailed capri sport as well but dunno if they wana help me out with info or not

 

ill have another go at the bumper this week i expect lol

ps buy a T5

 

fudgy, he would need to sort out a adaptor plate with a T5 added cost

 

im not sure exactly what your trying to achieve here pal

so your making a 2wd car, using a 4x4 mt75 box, but with the rear section of a 2wd mt75

is this because your using a v6 so need the bigger bellhousing ?

 

yes. its the only way of doing it as the type9 box that would fit stright on would last about 2 seconds with some propper power.
if only the mt75 had a detachable bellhousing

oh and p.s
a) the t5 ratios arnt right for what i want
b)id need to fork out for an adaptor plate for the bellhousing
c)the t5 costs to bloody much
d)ive already got both the boxws i need, just trying to find out how its done. so to the lot of ya

 

if i was you i would be buying a quaife type 9 sccr synchro box, you can pick them up plenty full for less than £600, i run one on my car for 4 years with no bother.

there are many ratios about for the mt75, i have a few, is it the input shaft thats longer for your v6 ebgine but has less/more teeth than a 2wd 4cyl motor ?

p.s dont run the short nose shaft without spigot support.

 

bloody hell mark you think im made of money this is a cheap track car with a 2k budget for the whole car

yes the v6 main shaft is longer. but it has 26 teeth on the main gear as oppose to the 25 teeth on the 2wd shaft.

if i cant get an answer on what to do then i was just going to run with the shorter 2wd shaft and machine up a small extension cup for the end of it so that it reaches. but would just like to know how other people usually do it.

 

ok , i dont think 600 is alot of cash for a gearbox, especially when im looking at finding myself a new one thats into four figures

i know that there are alot of ratio changes in the mt75 that arnt too common knowledge, i would bet there is a 2wd box with the same ratio as the 4wd box hence same input count.

 

have a look on here

http://congrave.virtue.nu/mt75.htm

 

may not be as much help as i thought

 

Use the entire gear set from the V6, that uses the long input shaft.
You must use the long input to reach the clutch / spigot bearing, and that means you must use the laygear that matches.
In turn, it is a lot easier then to use the mainshaft gears that match that laygear

 

ok thatnks bernie

btw. does that mean i need to change round the actual back half of the main shaft as well though as its different at the rear end where it used to go into the drive for the front prop. can i just pull all the geares off the 4x4 shaft and put them on the 2wd one, them use the front part of the 4x4 mainshaft and the layshaft?

 

Yes, yes, & yes

 

ah fook

ok thanks mate, uve been a huuuuuuuuuuuuuuuuuuuge help

 

if you swap your extended 4x4 mainshaft for the 2wd version , then i would be interested in buying the 4x4 mainshaft of you if its for sale ?


mark

 

Got another solution that i'm doing for my 24v.

MT75 4x4 V6 front case with a scorpio (bug eye) Diesel MT75 rear case and gear set. The input shaft on the Diesel box is the same length as the V6 I think it also has the same ratios but with a different 5 gear ratio.

 

well ive found yet another solution. probably not to everyones tastes but im going to try it and see how it goes.

see my rebuild thread for the details.
https://passionford.com/forum/viewto...404&highlight=

 

Here is what can be done to get a V6 MT75 2wd box

Just get one made up. 1 MT75 v6 4x4 box and 1 MT75 2wd Dohc box. Take it to a Transmission place hand over the 2 box's and about £100 +vat and ask them to 2wd it for you.
The basics are to remove the bellhousing, input shaft and the reduction gear. Then fit them to the 2wd box. This is the cheap way but it means using the Dohc gear ratios.
Or all the gears need to be changed across. This will cost a lot more.

Advanced Transmissions at Billingham did mine
One 2wd V6 box