There are many issues that you need to confront. One of the biggest is old parts versus new parts. Aside from the Factory Five kit most of the rest of the car can be built from used parts, including engine, transmission, brakes and suspension.
Transmission:
The first generation GTMs used a Porsche G50 transmission. The G50 was introduce in 1987 and retired in 1999 or there abouts. I know of 5 variations on this transmission, plus a long and short version of the case. To make the G50 work with an LSX engine, you will need an adaptor plate. In addition, make sure you get the following parts with the G50:
- speedo sender
- pressure plate
- friction plate
- release forks
- driveshaft adaptors
- slave cylinder
- rear mount beam ("short only")
You probably want to make sure the unit has been rebuilt/refurbished and has documentation. By the time you have all the pieces, the rebuilt transmission, and pay for core exchange (which you don't have to exchange), the bill is anywhere from $6500 to $9000. This is for a very good transmission. But it was built in the last century and you are going to hook this up to your brand new, dyno tuned LS3 engine.
The other option is to go with a new transmission built for
Factory Five by Mendeola. This has limited slip differential standard, a torque rating of 475 ft lbs (warranty 400 ft lbs) and a horsepower rating of 525 HP (warranty 450 HP). It costs (with shipping) $8900. It bolts directly to a LSX engine.
Nothing against Porsche. They are fantastic machines (I love my little Boxster). I have had some wild times on empty country roads in North Western Minnesota. However, I can't see bolting a 15 to 20 year old transmission to the back of a new engine. When you get right down to it, the dollars aren't that far apart.
If you go with the Mendeola, remember to order early.
There is a minimum three month wait on these units.
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