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hi all, i have a un1 mated to a ford cosworth engine and i was having a lot of trouble with my 1st to 2nd gear change i rev the car to 7250 (soft cut) and anything over 6000 the gear just would not engauge. it would just crunch until the revs had dropped low enough then it would go in gear...

As above, ive sent some gears (1-4) off for some work and need to know which 1 is 2nd. Im pretty sure its the 2nd biggest out of all 4 but to be sure can any1 tell me how many teeth it has Thanks

As per my other thread I have now found out that the un1 gearbox can't shift at high rpms(over 6500)does any1 know what can be done to improve it? I have heard of 2 things that can be done. They are, polishing of the synchro setup removing every other tooth on the synchros and polishing...

I'm thinking of doing it to a spare box and doin a couple of 1/4m runs. At the moment on my STD box with 400/400 bhp/trq I spin the 1 wheel in 3rd on 235 road tyres. Usually drivers side. Would welding the diff and running the same tyres break the input shaft? Would there b any reason I can't...

ive tried searching the forums, read through 15 pages and tried the search function, but couldnt find anything whats the best oil for a un1? i know its supposed to be 75w90 but semi syn? fully syn? race oil? millers, silkolene? castrol redline motul valvoline but what has every1 had good...

hi all. i have a renault un1 gearbox mated to a ford cosworth engine 2l turbo its mid mounted and gear changes via 2 cables. the box is in the car and works fine, it is easy to change gear slowly but when i try to do it quickly it never engages the gear properly resulting in grinding and...

1stly sorry but this isn't a gt40 car related question but is about the gearbox some of you run. I have a car I built using the Renault un1-13 gearbox out of a 21 turbo, it is mated to a cosworth 4cyl 2l turbo currently around 400bhp mounted in the back of a Renault 5 gt turbo. It weighs...

i am after an uprated un1 gearbox, with the 1 piece input shaft and preferably with a quaiffe diff to, needs to have the ford clutch spine on it to. bell housing and rear cover not needed cheers

i am running a car with a renault 21 turbo un1 gearbox in it (std) and was wondering what the limit is i know its roughly 350lbs/ft is any1 on here running more that this on a std box? also my car only weighs 1000kg so will it take a bit more power? and if any1 has an uprated one for sale...