968 transmission in 944?

I just ran across a serious 944 race car and it had a 968 transmission. Anyone know anything about this swap? I assume it can take more hp and torque but probably is hell to swap in.

100% bolt in. Major difference is one axle is shorter than the other. The problem most people have is driving a 944 speedo. However there are a couple bolt on kits for the speedo.

Could I run higher hp and torque on that transmission rather than a AOR? I'm just looking for options since my engine is going to run too near 450hp. What about the gear ratio? Will I have to shift like crazy? Can I change up the gears? What do I need to adjust since its shorter?

It really can't handle more power than the stock turbo trans. The 968's were NA and didn't make the same kind of torque that the turbo's did...

As I recall from doing research. The 968 6 spd has the same gearing as a n/a 944s or something like that. so you will be shifting alot faster for the same speeds as a turbo trans would.

i have have an na 3 speed auto that i have punished with 500 hp quite a bit and have not had any problems.they say the 968 4 speed auto can handle 450 hp and i have thought of putting one in mine.one thing about it i dont have to worry about missing a gear lol

Sur une phase 1 ,les fixations sont pas les memes

model 86 a 91 100% bolt in

model 82 a 84 big job

my car model 84 6speed 968 big job

I can't believe the 2 year of french they made me take at college actual benifits me. Would you mind elaborating on how they are different? If I'm looking at doing road racing, I'm guessing a AOR is the way to go? I'm thinking a 968 won't be worth it.

les models avec la traverse de boite fixe et fixation gauche et droit

sans modification me peuve resevoire une boite de vitees 968

pour instaler ma boite de vitesse de 968 sur la 944 de 1984 , il a falu replacer la traverse de le reservoire d'essence
pas de fixation droit
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sorry ma femme est pas la pour ecrire en anglais

The 6 speeds have no bolt holes for the early mounts per his pics. Also there is no point to the 6 speed since you will gain zero top speed or even acceleration with an additional gear to row through. The Turbo 5 is superior to the 6 speed. The only 6 speed worth it's weight in gold is one our French friend is more familiar with: the 968 Turbo S 6 speed.... I have about 450 to my crank (a little more) and I'm running a 9U turbo transaxle. I don't track mine, so I sold my AOR, but the 9U is taking the abuse very well...... I need to replace a clutch, mine slips under hard acceleration.... That will be done when my Cabrio is ready.

I am running the 6spd 968 transmission as my car is a 968. I can tell you that the transmission mount is different, the half-shafts are different, and the torque tube is different, although a 944 torque tube will bolt to it, the cases just don't match perfectly.

The 968 has a .78 ratio on 6th running through a 3.778 diff. therefore at 6500 rpm this produces a theoretical speed of 164 mph. (assuming adequate HP, consistent tire diameters, etc).

The NA 944 has a .829 ratio on 5th running through a 3.889 diff. producing theoretically 150 mph under similar terms.

The 944 Turbo has a .829 ratio on 5th running through a 3.375 diff producing a theoretical 173 mph.

There are custom 6th gears available (but rare) for the 968's Audi built 01E transmission that will provide a .6 ratio thereby making a top speed 213 mph at 6500 rpm! (assuming you had the HP to push it and the aerodynamics to keep it on the road). These custom gears are pricey and are used by the Ford GT40 Replica builders.

In spite of its variable valve timing, the 968's 3.0 liter engine still had a fairly steep torque curve, so the 6 spd gear box was made to have close ratios between the gears to best take advantage of the "sweet spot" in the torque curve.

Big V8's like the LS1 have gobs of torque at the low end and just don't need close ratio's on the gears. In fact, you can even start off in 2nd or 3rd and not have to worry too much about shifting until you get to highway speeds.

IMHO, I would say the Turbo is the better transmission for our application since the gears are spaced further apart, it is a more direct fit into a 944, and more of the Turbo transmissions were built, so a good used turbo trans is generallly less expensive than the 6spd.

In my case, since I already have a 968, there is little benefit to changing over to the turbo 5-spd. It is also fun just to have an extra gear to run through when your feeling like one of those truckers running a 13 spd Road Ranger.

What are you guys running for Torque. I mean HP doesn't hurt the transaxle so much as torque. Also, what's the highest rpm you guys run on these transaxles. Right now I'm looking into a road racing setup and I would like to run in the 7,500-8,500 range without problems with the trans axle and all.

bp944, I am not sure what you mean by HP doesn't affect a transmission as much as torque. HP is torque with a speed component. HP is derived from torque by the equation: HP = (Torque x Speed) / 5252. [5252 is just a unit conversion assuming torque in Ft-Lb, crankshaft speed in RPM]. Therefore they are basically the same. I won't get into a discussion of peak torque vs. rpm range since that is far more complicated.

I think what kills these transmissions is extreme shock loading, like what you have in drag racing where you are starting from a standing start. In road racing, when you are shifting hard the car is already moving so the shock loading on the gears is not as high. As long as you are not slamming a downshift (which is not going to help your lap times anyway) you should be fine. Driving smoothness will gain you seconds in road racing with the added benefit of being easier on the car.

You are correct and I was quite wrong. I was correlating torque to shock loading for some reason. I'm just trying to figure out what the limit on these transmission is. I'm building an engine right now and its just getting to be a little more powerful than I had intended. I'll be sitting with a high revving engine at about 500-525hp.

pb, Renegade Hybrids says the 944T transmission is good for 450 hp. This is probably a conservative number assuming that some customers just can't resist doing burn outs. I think that if you shift smoothly, you can handle more power, as evidenced by the GT40 and other replica cars that are running higher hp numbers. If you are still in doubt, it might pay to have an experienced Porsche Tranmission guy reset the shimming, check the bearings, set the backlash, and check all of the contact patterms on the gear sets.

I am not doubting your hp numbers, but just be aware that if you are getting these numbers from bolt-ons, the net hp gain is not necessarily additive. Every aftermarket parts supplier likes to present their modification part in the most favorable light. That light is usually in the form of their exclusive modification applied to a basically stock engine, or with carefully chosen complementary modifications that fully extract the power potential of the parts that they would like to sell to you.

On the other hand, if you are predicting the hp based on increased cylinder bore, bigger heads, bigger intake, custom tune, large cam, etc. then they may very well be realistic.

if it aint broke dont fix it.with a manual transmision you can learn to control your shifts and resist burning the tires off every time you drive it .it will last a long time.alot of the trouble in my experience with a manual trans is missed gears spining tires that hit traction all of the sudden moment will destroy any manual trans.lack of lubrication and preventive maintanence.how was the previous owner on the vehicle that you are converting.what is your budget.do you fix your own vehicles yourself or do you have to pay someone to do it for you.all of this factors in when doing a conversion.i have an 87 turbo im going to convert to ls 3 in the near future that was very well taken care of by original owner.i dont plan on racing it but just driving occasionly.i also have an 86 na auto equipped 944 that i have been experimenting with for several years that has a very healty small block and the only trouble ive had with transaxle is worn axleshafts that i have replaced.i have drag raced drove to work to the store and cruised around beat on it and it has passed the test of time.