Trans and Clutch Questions

[NKN84944]

As I posted in my last thread I broke the transmission on my car last weekend, and I am in the process of locating a used one to drop in. My question is what will fit into my car? Will an 86-88 924's transaxel work? How about 85.5-89 944 NA's? Are the transmissions of 944 S's compatible?

When doing the clutch, what else should I replace besides the things included in the kit and the fly wheel seal? I heard that it is often a good idea to replace the bearings in the torque tube. How about the pilot bearing? My car now has 125,000 miles on the clock. The clutch has not failed, but it is due time to replace it. What do you think the chances are that I would have to replace the fly wheel?

Thanks,
Nate

[legion]

Anyone, please correct me if I'm wrong...

All 924, 944, and 968 transmissions are interchangeable.

That being said, I know that early late 944 transmisssions supply speed information. Early 944 and 968 transmissions do not, but that really isn't an issue for you as your car gets speedo info from the driver's side front wheel (right?).

I think the big issue for you would be the relative gearing of the transmissions. I think an 'S' transmission would work fine, as well as any 944 NA or 924S transmission. I would think the gearing on an S2, 951, or 968 transmission might be too tall for your relatively lower power output.

There is no difference on the mounts or connection to the torque tube, right?

[Mike Markota]

I'm in the midst of a clutch/torque tube/ possibly engine replacement on my 85, so I been thinking of what you are thinking for months now lol

Like legion said, all transmissions are interchangable....but since you have an early car look for an early transmission. Speedo cable goes to the transmission.

Replace the pilot bearing (should come with a clutch kit, if not...easy to get), the flywheel and pressure plate bolts, rear seal. The flywheel SHOULD be fine, but its gonna have to come off to do the rear seal, might as well get it machined (cheap) or lightened (what my early 85 is getting)

The torque tube usually is good although I have to replace mine because the splines on the shaft are gone. Does yours make any noise? Search for problems with the torque tube and see if you have any.

This website is the bible for all 944 maintence/FAQ

http://www.clarks-garage.com/shop-manual/repair-procedure-index3.htm

Good luck and if you run into any problems post em and youll get help. also try rennlist.com (forums) for more info. Learn as much as you can about these cars so they dont suck your wallet dry.

[924RACR]

The only correction is that 2.0L 924's (excluding turbos) won't work, they've got a smaller input shaft (though they'd probably bolt up). The 931's (aka 924 Turbo) trans does interchange with the 2.5L cars, with the noted exception of gearing being potentially different...

[rb101]

Originally posted by 924RACR
The only correction is that 2.0L 924's (excluding turbos) won't work, they've got a smaller input shaft (though they'd probably bolt up). The 931's (aka 924 Turbo) trans does interchange with the 2.5L cars, with the noted exception of gearing being potentially different...

I've hear of people builting an adapter between the two different shaft sizes. I also think you can swap the input shaft between the two.

[NKN84944]

Thanks for the info guys. Excuse my ignorance, buy how do you lighten the flywheel? I always thought if you were going to go lighter, you just replace it with an aluminum one. I also have been told that it is a good idea to replace the two bearings on the clutch for, anyone have any comment on this?

I found a transmission very close to me from a 88 924S with 89K on the clock... thinking this is a good bet. I don't have code for this transmissions from the 924S, but I am guessing that it is probably the exact same thing that I have in my car. This car would have a hub driven speedo also correct? Looks like I am going to have a busy weekend, but hopefully she will be up and running by the end of it

[wizkid918]

im replacing bearings in the clutch pivot fork. 8$ each, so not too bad, im also replacing the pin that sets in them. when i took it out (199k miles), it had some grooves from the bearings, and u might as well get it done now so it doesnt start clunking 20k miles later just to dig all the way back down

[Mike Markota]

The 88 924S transmission should work because of what you said. Same basic car as a pre 85.5 944 ..good luck!

[NKN84944]

Well I found under the technical specifications part of Pelican that the transmission code for my 944 is 016K and for the 88 924S it is 016J. So I went to the PET and went through all the parts and it seems like all the important things are the same, but a couple small things were changed between the transmissions (such as a seal, washers, etc.). The drive shafts are also different for the cars, but it wont make a difference since they use the same CV joints. Thanks everyone

[robm-951]

Originally posted by NKN84944
Thanks for the info guys. Excuse my ignorance, buy how do you lighten the flywheel? I always thought if you were going to go lighter, you just replace it with an aluminum one.

I'm not sure if the N/A's are the same, but heres a couple of pictures showing a lightned 951 flywheel next to a stock 951 flywheel. These pictures were taken by David Floyd over on Rennlist.

I had mine done the same as this. A machinist friend shaved mine and then I had it's balance checked afterward. After lightening the flywheel was still balanced. The lightened turbo flywheels come in at ~8 lbs versus ~6 for the aluminum ones.

There are some that have complaints about lightened flywheels, but I don't have any. The ones with complaints may also have lightened cranks as well.



Rob

[SoCal Driver]

Resurfacing the clutch friction area is more important than lightening. Replace the pilot bearing, throwout bearing and seal for sure.

Check the clutch arm fingers for cracking. You can relube the clutch arm roller bearings or replace them. Be sure to lube the new ones. A light coating of moly grease on the drive shaft splines will help the clutch disk movement. Also on the TO cone.

Use a spring center clutch disk.

Remove the sensors (or the bracket and the sensors if the sensors will not come out) BEFORE you remove the bell housing.

Don't break off the reference sensor pin on the fly wheel.

Use the 924S transmission. Use your original axles. The reason the axles are longer on the 924S is because it uses aluminum trailing arms. If you can get the trailing arms and axles off the 924S for the same price as the trans consider replacing the steel trailing arms on you car. Better stub axle bearing set up.

The speedo cable on all early 944's and the 924S goes to the left front wheel. Later 944's use a sender on the left side of the trans. You can use such a trans but watch out for the gear ratios on non N/A trans.

Replacing the torque tube bearings is a PITA. Get the torque tube from the 924S.

[NKN84944]

Thanks for the info SoCal! Definitely very useful info.

robm-951, they took a serious amount of metal off that flywheel, must have taken the machine shop quite a bit of time to do that.

[Brando]

Where are the other 2 posts for the sensors??

Originally posted by robm-951
I'm not sure if the N/A's are the same, but heres a couple of pictures showing a lightned 951 flywheel next to a stock 951 flywheel. These pictures were taken by David Floyd over on Rennlist.

I had mine done the same as this. A machinist friend shaved mine and then I had it's balance checked afterward. After lightening the flywheel was still balanced. The lightened turbo flywheels come in at ~8 lbs versus ~6 for the aluminum ones.

There are some that have complaints about lightened flywheels, but I don't have any. The ones with complaints may also have lightened cranks as well.



Rob

[SoCal Driver]

The two pins close together are for the third sensor that the dealer is supposed to us with their computer stuff. Don't need them.