Speeddemon944

Hi All,

I recently completed swapping out my 951S trans for a 968 trans. During the info gathering stage I found a few threads with conflicting info on whether or not this could be done and, if possible, what parts were needed. I can happily report that it is possible and I have all the details about it that I thought might be nice to put in 1 place.

1. Can it be done - YES!
2. What parts are needed -

Tranny (duh)
Driver side 968 half-shaft - p/n - 944 332 037 06(08)
Pass side 968 half-shaft - p/n - 944 332 038 06(11)
968 Shift lever - p/n - 944 424 015 02
968 Shift rod - P/n - 944 424 019 06
Speedo mod - Lindsey racing sells it - http://www.lindseyracing.com/LR/Parts/968SPEDO.html It is not cheap and you still have to fab up an arm to hold the new sensor...I haven't done this as it is dedicated race car

With these parts you can install the trans just like normal and it works great! In order to address the cooler loop I added an external cooler similar to the Van setup - https://rennlist.com/forums/924-931-...on-cooler.html

I would like to thank Van and Rogue_Ant for their knowledge and advice. Hopefully this helps someone else in their adventures.

FHM

Thanks for the info!

blade7

968 torque tube and bell housing ?

FHM

Don't think it is needed

dizzyj

whats the benefit?

CyCloNe!

Quicker clutch changes... 968 had a 2 piece driveshaft so you don't have to remove the torque tube, trans, lower rear suspension to change the clutch. My understanding is the clutch can then be changed in roughly 3hrs vs the 16hrs or whatever. This is on my to do list eventually.

Bill

What are your impressions? Is the car faster, did you do a before/after timed acceleration run? How does it work with the 951 power band? Driving a 968 I know there is a lot more rowing through gears. Why did you do this upgrade, I have heard the 6 speed is stronger as long as the R&P are set correctly. What is your rwhp?

George D

Download the attached Excel editable doc. The stock 968 axles installed in a 951 will work - one side will have about a half inch less side to side actuation. No real issue till you're breaking the CV cages.

The 968 G50 based transmission is much stronger than the 5 speed. You'll hear otherwise - F*** em, they're simply wrong. My 968 box has the gears as shared heading AUDO 3 - 6 meaning the gear changes.

Clutch change is under 3 hours, you can use 911TT sport OE clutches, and the 968 six has gearing options from AUDI's 8 series manual turbo diesel sedans.

G

Speeddemon944

I kept the 951 Torque tube and bell housing - the trans looks like it won't mate up but it will I measured the bolt spacing before I tried to install it

For me, since it is a dedicated race car - I found myself being at the top of a gear as I approached a corner but well before my braking points. So I had to either hold the throttle to maintain the RPM or short shift. The closer gear ratios should allow me to stay in the optimal power band more of the time without having to make such decisions about short shifting or not.

I have a 2 post lift and can tell you the book time is a liar - maybe for a newbie but really I would say...6-8 hours?

I answered part of this above and the first test day is on the 30th so cannot speak to some of your questions. I am prepared to do more rowing but should be 2-3 seconds faster per lap I think - based on feedback from others with a lot of experience with these cars. Yes, the trans is stronger. I race in GTS3 in NASA and V5 in POC and haven't figured where I will land in PCA - GT something. I make about 250 rwhp and weigh about 2850. The ability to handle more power was not my main concern but is an added bonus. It was mainly how often I found myself having to short shift or hold the throttle. The *theory* is that I will be able to stay in the power band more often and be faster out of the corner. We will see and I will report back.

Speeddemon944

Oh I also forgot to mention that the trans was open when I got it and had an OS Giken installed per PMNA recommendations.

V2Rocket

Why would there be any issue?
The 951 and 968 have the same rear suspension, the same wheel-end stub axles...unless the transmission mounts in another place?

Dimi 944

The transmission is wider and the mount is offset to one side.

V2Rocket

Haven't seen a 968 trans x-member - is it different than the 951?

thingo

Yes they are, different fuel tank also. The mount for gearbox is in the same position though.

blade7

Was it because you didn't have the 968 bell housing and torque tube, or you didn't think saving some time on the clutch change was important ?