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4X4 Cosworth gearbox issues after rebuild.

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Old Jul 23, 2018 | 09:07 PM
  #1  
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Default 4X4 Cosworth gearbox issues after rebuild.

Evening all,

I've just had my gearbox rebuild and it's drives mint and selects gears perfect on the twisty stuff, however after a long straight run say like on motorway if I come off and to a stop I cannot select a gear.

I have to pretty much ram it through the dash to try select first & second is a pain as well. I had to pull away from a set of lights earlier in third! Then come out later it's fine again.

Has anybody had similar issues like this? as its doing my head in!

Thanks all
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Old Jul 24, 2018 | 09:40 AM
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If a company rebuilt I I would take it back.

It sounds odd that fine from cold. If you are ramming it home you may bend the selector forks.
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Old Jul 24, 2018 | 11:12 AM
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Try changing the oil to something else, give the guys who rebuilt it a ring and see what they recommend grade wise

Cheers Paul
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Old Jul 26, 2018 | 07:29 AM
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Originally Posted by Caddyshack
If a company rebuilt I I would take it back.

It sounds odd that fine from cold. If you are ramming it home you may bend the selector forks.

I thought it was odd to, it's like its overheating something in there on a long run.


Originally Posted by turbotrev
Try changing the oil to something else, give the guys who rebuilt it a ring and see what they recommend grade wise

Cheers Paul

The've put in an ATF fluid that they were recommended to use. Spoken to Opie and they have advised me a different grade (75w90) so i shall try that and see if any better.
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Old Aug 3, 2018 | 07:18 PM
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Atf is definitely the stuff for the 2wd t5 box

not sure about the 4x4 box, but I'm sure it's not atf?
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Old Aug 3, 2018 | 07:43 PM
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If you turn the car off dose it go into gear?
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Old Aug 6, 2018 | 10:32 AM
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it'll be the oil

the mt75 needs a very specific oil that is no longer listed by ford
try that first
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Old Aug 17, 2018 | 08:27 AM
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Originally Posted by dojj
it'll be the oil

the mt75 needs a very specific oil that is no longer listed by ford
try that first
Yes it turns out it was the oil grade, put in 75 / 90w and its spot on. Its now usable again!

Thank you everyone for help on this. I'm a happy Cossie owner again!
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Old Aug 17, 2018 | 10:14 PM
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Originally Posted by Ollie L
Yes it turns out it was the oil grade, put in 75 / 90w and its spot on. Its now usable again!

Thank you everyone for help on this. I'm a happy Cossie owner again!
Glad for your sake it was a simple fix.
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