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Remove the shaft from the trans. Take it to a machine shop and have them match up the spline with a new one. Cut the existing shaft down back to good metal. Weld a mating plate on the existing shaft, and a plate on the new spline piece. Mate the two plates together and weld them up. Heat treat it and back together. It's an ugly job, I know because I had to do that on something called a Rzeppa joint for an antique car. The spline was an SAE #20 pitch, which is pretty easy to find, but mating it to the existing shaft was a j-o-b.
Ahh, we used to have a red one around here that the owner had for a week before he destroyed the transmission. He'd been here a couple of times asking for advice before he purchased it. Had the one of the local Porsche Dealerships call me asking if i'd work on a trans for them and sent them to Greg Brown, never heard back from him after that.
AFAIK a new G28.12/13/55 input shaft/5th gear 928 302 905 32 has been NLA for at least 2 years- they were available in 2012 for $1300 but no longer. I think your best bet would be to find a G28.12 that ate a shift lockout spring and FUBAR'ed another gear or three, that could donate a 5th gear.
how did it break? what were you doing when it gave way? ive broken one on the dyno, when the ebrake was barely on , but it caused huge vibration and the same thing happened.
I cant believe we cant get more 5th gears! i have good splines on my broken 5th on the holbert transmission, too bad you cant just replace the gear on mine that is damaged. (the two gear set)
08-20-2015, 12:44 PM
What are my options? 91 GT PSD Transmission with broken input shaft
i have good splines on my broken 5th on the holbert transmission, too bad you cant just replace the gear on mine that is damaged. (the two gear set)