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2wd/4wd cossie gearboxes

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Old 17-06-2011, 03:52 PM
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CBR6DC
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Default 2wd/4wd cossie gearboxes

i'm curious to know - could i make a 4wd gearbox into a 2wd or is it not feasible? i need a 2wd gearbox but there is none - however 4wd isn't as strong but there's more of them.

i'm thinking just don't put the 2 front wheel drive drive shafts in and fit a blanking plate and seal them off or does the 4wd use the cv joints that go into it to operate and so without them won't work as missing a cog as such?

does anyone get what i'm thinking as i think i'm starting to confuse myself? lol
Old 17-06-2011, 04:54 PM
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charlie luciano
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Completely different gearboxes fella, buy yourself a T5 uprated gear kit job jobbed

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Old 17-06-2011, 05:40 PM
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tabetha
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Depending on the power you want to put through it, may not even need to uprate the T5.
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Old 17-06-2011, 05:49 PM
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the 2wd box is the T5
the 4wd box is the MT75
you can use a 2wd MT75 box (as found bolted to the back of every dohc sierra) as it's a direct fit to the pinto block so all you have to sort is the starter and prop and mount, but seeing as you can buy a complete dohc sierra for less than the price of a decent T5 and it comes with all the spare parts you'll ever need to fit it's sort of the easiest solution if you want one

not too good over the 300 brake mark though but it's a quick cheap easy fix for your scare T5 issues
Old 18-06-2011, 06:18 AM
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CBR6DC
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cool, cheers chaps. i know they are different gearboxes butthy all mount the same way and both have a propshaft so was just curious. money i'd save over buying a t5 i'd have to put towards hubs and driveshafts lol.

crap...

i'll bear that in mind though dojj as i have no intention of doing much more than stock.....

been told a T34 and grey injectors are the way to go WHEN i get an engine lol.....
Old 18-06-2011, 02:37 PM
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tabetha
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I run a T34 inducer in a T3 housing with greys, best advice I could ever give is ditch the std ecu and go after market, I went emerald K3, and haven't looked back.
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Old 18-06-2011, 04:32 PM
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another guy i was speaking to said to run a hydraulic clutch rather than stand cable clutch as the clutch pedal plastics and cables snap - if i did this to a 2wd MT75 gearbox from a DOHC sierra would it inprove it enabling a touch more performance?

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Old 18-06-2011, 04:38 PM
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you need to find out how much the hydraulic coversion would cost first
Old 18-06-2011, 04:57 PM
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Originally Posted by dojj
you need to find out how much the hydraulic coversion would cost first
Ł360 reyland, Ł350 off ebay for martin hadland one (with reyland in the pic so same one?) or Ł234 burton power (exchange although not entirely sure what you'd have to exchange as it would replace all of it wouldn't it?)
Old 19-06-2011, 05:27 PM
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best thing to do is get a 4x4 cossy box and a 2wd dohc one and build a 2wd box with the 4x4 internals. (dohc have different internal gear and ratios) with using a 4x4 bellhousing the clutch and everything will match
Old 19-06-2011, 05:55 PM
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Originally Posted by CBR6DC
Ł360 reyland, Ł350 off ebay for martin hadland one (with reyland in the pic so same one?) or Ł234 burton power (exchange although not entirely sure what you'd have to exchange as it would replace all of it wouldn't it?)
Burton's require the bell housing for exchange as it is machined for the slave
Old 19-06-2011, 08:18 PM
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Originally Posted by 2ndGear
best thing to do is get a 4x4 cossy box and a 2wd dohc one and build a 2wd box with the 4x4 internals. (dohc have different internal gear and ratios) with using a 4x4 bellhousing the clutch and everything will match
the internal ratio's of all the mt75 boxes are all the same other than those fitted to the dieseal granada/scorpios/transits so i don't know who's been feeding you duff info

bolt the standard dohc box to the rear of the cossie block and, other than the clutch forks potentially being on the wrong side, everything else just bolts up
Old 19-06-2011, 09:20 PM
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Dojj it doesn't work. The YB has a bigger flywheel than the Dohc and i think the input shafts are different lengths. It almost like building an mt75 box for V6 fitment.
So the 4x4 cossie bellhousing and inputshaft need to be fitted to the Dohc 2wd box.

Or get a YB to pinto flywheel from Burtonpower as its smaller

Last edited by robrs2; 19-06-2011 at 09:21 PM.
Old 20-06-2011, 05:44 PM
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that info is bollocks.
a cossy has a 25 tooth input shaft and a DOHC has a 26 tooth input shaft. All cossy gears have no lines on the for ID or 1 line for syncro type DOHC have lines on them as they are different ratios.
I fix gearboxes for a living - I KNOW

Originally Posted by dojj
the internal ratio's of all the mt75 boxes are all the same other than those fitted to the dieseal granada/scorpios/transits so i don't know who's been feeding you duff info

bolt the standard dohc box to the rear of the cossie block and, other than the clutch forks potentially being on the wrong side, everything else just bolts up
Old 20-06-2011, 07:50 PM
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thanks for everybodies info... i am still in the same boat now lol...
Old 20-06-2011, 07:56 PM
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Originally Posted by robrs2
Dojj it doesn't work. The YB has a bigger flywheel than the Dohc and i think the input shafts are different lengths. It almost like building an mt75 box for V6 fitment.
So the 4x4 cossie bellhousing and inputshaft need to be fitted to the Dohc 2wd box.

Or get a YB to pinto flywheel from Burtonpower as its smaller
been there, done that, everything fits don't forget i was breaking V6 boxes left right and centre and went through 8 in the space of about 18 months

i even fitted the internals from an MTX75 box into a casing just to prove that they would fit and they did

and my research ended in 2002 so lots of people are coming up with "new" ideas all the time
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