Man Trans

Technical Information and Restoration Parts for the 928

Manual Transmission

Porsche used two different manual transmissions in the 928. Pre 1985 cars had a Porsche designed Syncro System that was prone to wear - especially the second gear. After 1985 Porsche licensed the Borg Warner system. The later transmissions were smoother and more durable.

Porsche offered a number of different final drive ratios based on country of delivery and year model. They also offered a variety of optional limited slip differentials depending on year model ending with an electronically controlled system in the GTS.

Year Model	Number	Final Drive Ratio	Limited Slip Option	Comments
78-80 (world)	G28/03	2.7500
80 S (world)	G28/05	2.7500		Oct 79 on
81-82-S (world))	G28/05	2.7272		Jan 81 on
83-84 S (ROW)	G28/07	2.7272
83-84 (US)	G28/08	2.2666
85-86 (ROW)	G28/10	2.7272
85-86 (US)	G28/11	2.2000
87-88 (ROW)	G28/12	2.6363
87-88 (US)	G28/13	2.2000
88-89 (world)	G28/55	2.7272	40% LSD(Std)
90 (world)	G28/55	2.7272	PSD (Std)