smudaaar

do you make a lsd kit for pre 85. If so what kind of % slip is it. I'm looking for a race style kit for my 1980 euro s and don't want to change the trans out

Vilhuer

You are talking about '78-79 vs '87-88 difference and they are different. But change did not happen in '84 vs '85. It happened already in '80 when G28/05 was introduced. All '80+ G28/05 to G28/57 gearboxes share same TT and crossmember they use has same critical dimensions. Shift linkage is different between '80-84 and '85-95 but thats only difference if exhaust mounting points in crossmember are not counted. There is also several different versions of earlier '78-79 shift linkage. Or I should say '78 to early '80 MY versions as 4.5L cars used G28/03 for a while in early part of '80 MY.

Have you seen G28/01? G28/03 is usually considered to be first type used in even earliest '78 MY cars.

John Veninger

Correct.
The only "difference" is exhaust mounts (or lack of) to the cross member

Carl Fausett

I'm certainly not the last word on transaxle swaps around here. My experience is limited to what I have done personally.

I would expect John V or Mark A could weigh in on which transaxle changes require torque tube swaps too, and I'd beleive whatever they say.

Erkka, your info sounds right. But if memory serves, I thought the first "Borg-Warner" axle involved only minor upgrades to the synchros (1985) and only later (1987) did the entire case (and mounts) change.

GlenL

The "Central tube" P/N 928 421 012 26 is listed for all 928s from sometime in '80 through the end of production.

I've got an early '80 Euro and an '85 tranny as a back-up. The PET lists a different intermediate shaft and clamping sleeve. Is the difference just at the front and not at the back?

Vilhuer

There is only relatively minor changes between '85-86 and '87-89. Those affecting case were input shaft bearing, inner shift rod support bearings and reverse gear shaft IIRR. In any case mounting remains exact same from early '80 MY forward. Thus TT and crossmember are directly interchangeable. Easy rule to remember is G28/03 vs everything made later. What can be changed with what isn't always so simple but G28/03 vs G28/05 was single large change when TT was shortened 30mm.

Vilhuer

There is difference at the back of the TT also in G28/03 vs others. Rear clamp bolt position on input shaft was moved 10mm forward compared to gearbox front mounting surface. '78-early '80 and late '80-'95 TT and gearbox mixed pair can be bolted to each other but rear clamp bolt do not have space to go in. That is real reason why G28/03 cant be used with '80+ TT and why '78-early '80 TT can't be used with late '80-95 gearbox. Its possible to modify TT center shaft to make room for mixing old to new or new to old but in both cases TT centershaft needs to be modified.

Selector arms must be selected based on TT lenght and if one wants correct movement also based on syncro ring style.