333pg333

I'm looking at one that is for sale and these are the numbers that the seller has read from it.

964.301.103 5R
950.301.102 or there is a stamped serial number which starts with
G6400.....

I assume that this is a 964 box. The owner says he thinks it's off a 4wd 91 model and he was going to convert it back to 2wd. I'm not even sure if this is possible? What sort of dollars is a good one worth? My application would be for a high powered race car of over 600hp/tq. I think it's a 5 speed.
T.I.A.

Strega(UK)

I believe the G64 part of that lot does relate to a Carrera 4 964.

Geoffrey

4wd box. For your application, you'll want a large R&P box, like a G50/52, 993Tt converted to 2wd, or a later cable shifted 996 box. Personally, my choice would be a G50/52 5spd with appropriate gears.

333pg333

Thanks guys.
Geoffrey. From what I gather the large R&P box are the turbos not n/a. I also understand that the 993 has a viscous coupling in the front of the box, whereas the 996 doesn't. Assuming that the 4wd is converted back to 2wd, I'm not sure if one is better than the other. I think I will also be flipping the box and running it upside down so not sure if that impacts on anything else.
So to clarify, this gearbox that is being advertised is from a n/a C4 and therefore not up to my needs?

Geoffrey

964 4wd boxes and 993/996 4wd boxes differ greatly. A 964 4wd gearbox cannot be converted to 2wd. The 993/996 awd boxes can by simply removing the viscous coupler, machining off the nose, and replacing the end case. True that the 964/993 turbo boxes are large R&P. Later 996 GT3 boxes are also large R&P.

If you flip it upside down, how are you planning on getting 5 or 6 forward gears and 1 reverse gear?

38D

You just flip the diff...that's how all the kit car guys use G50s in their mid engined kits.

Geoffrey

I knew you could do that with the 930 box, but I thought that the G50 case is asymetrical at the differential, especially with the large R&P. I could be wrong, I'll have to look at one.

333pg333

So would this flipping the diff be possible on say a 997 GT2 gearbox??
Edit: I meant 996 GT2, sorry. Someone mentioned that these have 'Hypoid' gears and that the diff was offset, meaning not as easy to use in a front or mid engined situation. Any guesses?

Erik @ Carquip

That is not correct. You can not flip the differential in a G50. You have to run it inverted. Just thought I would put in my two cents. Let me know if I can be of any help, we do these gearboxes all the time.

Warmest Regards,


Erik Johnson
Carquip Sales
(303) 443-1343 ext 2 work
(720) 980-9407 cell

333pg333

Erik, thanks for your input. So to clarify, are you saying that you can't 'flip the diff'? So how do those mid engined kit cars run these trannys? Also what's the difference if you turn or flip the tranny over v's spinning it 180o if you get my meaning? I would assume that by doing it one way, you would have 1 forward gear and 6 reverse?
Patrick

38D

I stand corrected. Looks like the it guys run it backwards & upside down.

http://www.ultima-gtr.info/pics/020203transfit.jpg

Geoffrey

Thats one way to obtain better driveaxle angularity...

333pg333

Isn't backwards and upside down just flipping it?