hi all i am new to all this, i have a my99 uk turbo with ppp i have blown 3rd gear but i have sourced a gearbox for cheap which needs the centre diff viscous replacing so i gues i can use mine as only rd gear gone on my box, howvere i cant find any guide etc as to how to remove and replace the centre diff, i have never done this before... cant be too hard can it. any help and advice would be very much appreciated.
I will have both gearboxes on the floor so cnt b too hard.

 

Yes I know this is a different gearbox but this may be of help.

http://www.uklegacy.com/forums/index...owtopic=101697

 

hi thankyou , this doesn show me how to remove the centre diff, so i have to remove the rear gearbox casing, then how do i get the diff out is it pressed in or bolted or wht ? sorry if i seem a pain lol

 

Nope, dead easy, it just pulls out. No need for special tools or anything. Do it on the dead box so you get a feel for how to get it out then you will be better able to change the one on the ' good box '

Just as long as both are similar codes TY754 VN1AA is correct for a MY 99 UK car.

David APi

 

The front and rear diff's have to be the same ratio don't they?

Probably a dumbass question.

 

No; Uk cars generally have a 3.9 front diff and a 3.545 rear diff with a 1.1:1 step off ratio in the middle [ multiply 3.545 by 1.1 and you get 3.9 ] That is to lower propshaft speed and reduces noise vibration & harshness [ NVH ] which many manufacturers spend heaps on doing.

JDM cars use a straight step off and have the same ratio front and rear. Their road speeds are lower than UK averages and NVH is less of a problem over there.

David APi

 

Cheers. I have a JDM STi so thats probably where I got it from.

 

Is that the same for an MY00 David?

 

Abso-rootin'-tootin'-lutely