Seeking gearbox expert advise, lost 5th & 6th gears

[Smallblock454]

Hello Giller,

thanks for the photo.

Problem i see is that you have to manage to bring everything together exactly and without tenseness. Means to fit the shafts into the bearings of the housing and torque the housing to the differential. In general this is why you mount the gearbox housing to the differential while the differential shows shafts up.

5th and 6th gear: Don't think it can be caused by the cable. If one gear works and it is the right cable, shifter and gear lever all gears should work. More probable that a claw can cause this problem.

Have you tested to put in 5th and 6th gear manually at the transmission?
Do you have a short shifter mechanism?

Regards, Markus

[Gilles]

After disconnecting the shifter cables from the transmission, I tried to engage 5th and 6th gears manually (car on jack stands) and after several attempts only once managed to engage 6th... this shows that it is an internal issue and not cable related.

Yesterday I called two specialty shops, both of them specialize in Porsche transmissions: GBox mentioned that it could be a broken shift fork and the other shop California Motorsports, mentioned that it could also be a broken retaining clip, and either way the transmission has to come out..

For reference are the numbers 6 and 7 on the attached picture.