Diff

[briand]

Does anyone know where to get a recon diff for my 1994 4.0l Chimaera, for some reason mine has just collapsed. I know there are two types, but if anyone can help that would be great. If I get a recon or a new one is it a matter of telling the garage just to fit it, or doeas anything have to be shimmed up? The reason I am asking this is, I am in Aberdeen and there are no TVR dealers around, only a Porsche / Merc dealer.

[GreenV8S]

It has to be shimmed up, but there's nothing special about the TVR diffs. If your local place knows how to do any diff they should be able to do yours. I'd advise against buying the diff yourself and asking somebody to fit it - if anything goes wrong nobody will take responsibility for it. If your local place can't find the right replacement part on their own they probably don't have the necessary experience to fit it. But I'm sure there will be a gearbox/diff specialist somewhere in your area that would take the job on. Peter Humphries (and a green V8S now on its third diff, second gearbox, fourth clutch etc etc)

quote:Does anyone know where to get a recon diff for my 1994 4.0l Chimaera, for some reason mine has just collapsed. I know there are two types, but if anyone can help that would be great. If I get a recon or a new one is it a matter of telling the garage just to fit it, or doeas anything have to be shimmed up? The reason I am asking this is, I am in Aberdeen and there are no TVR dealers around, only a Porsche / Merc dealer.

Edited by GreenV8S on Tuesday 20th March 14:25

[brian d]

Thanks for that Peter I will try to find someone who can purchase and fit. By the sounds of it diffs and gearboxes appear to be a common failure. When you say shim does this mean it requires to be shimmed into the axle or is the shimming just for the rebuild of the diff ? Brian ( and nearly to be one new diff, no new gearbox and no new clutch)

[GreenV8S]

No, not at all common. The green machine gives the transmission a pounding because it is putting out roughly the power of a 500 and the transmission was originally designed for something like half that. It also gets very heavy (ab)use as I take it on the track most weekends. As bits of the transmission have failed they've been replaced with uprated components, but as I increase the power output even further some of them have to be uprated again. At the moment it has a Griff 500 clutch, toughened Vitesse box, R&D competition diff, uprated CV joints and custom hardened half shafts. So far so good. The shimming is to correct the clearance between the crown wheel and pinion. There is an element of guesswork involved because the clearance changes as the diff beds in, which is why you probably want to get an experienced transmission specialist to do the work. Otherwise you may end up with a diff that whines, has too much backlash or wears quicker than it should. Cheers, Peter Humphries (and a green V8S)

quote:By the sounds of it diffs and gearboxes appear to be a common failure. When you say shim does this mean it requires to be shimmed into the axle or is the shimming just for the rebuild of the diff ?