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PostPosted: Tue Jun 25, 2002 2:18 am    Post subject: Reply with quote

Hallo again Scott.You know my problem with 924 trans.I decide to risk and to put for a couple of month a 924 trans.I understand that I have to make another coupler(from 20 to 25mm) but I need to know that the rest of trans is a bolt on or I have to make some severe modiffications.And how do I recognize that is a 4 or 5 speed gearbox? Thanks.Gra
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Joined: 29 Jul 2001
Posts: 8298
Location: Royal Oak, MI, USA

PostPosted: Tue Jun 25, 2002 2:40 am    Post subject: Reply with quote

OK, sounds like to wish to bolt the 924 trans to the 944 torque tube. OK. Yes, you need to have the 2 ends of the 2 different size couplers together, to connect the 25mm torque tube shaft to the 20mm input shaft on the trans.

I am sure you will want and need a 5-speed 924 trans, not the 4-speed (though there I do know of someone putting a 924 4-speed in their 944! - another issue, let's not get distracted here). The 5-speed 924 trans should look the same as the trans you are taking out, the only obvious difference (other than serial number) will be the small input shaft.

The 4-speed trans will look very similar, but is shorter in overall length. Naturally you will also need to make sure you do not use a snailshell trans, which came on the '79 924, and which looks completely different. Here's a picture of the snailshell (scroll down till you see the trans):

You will notice that the driveshaft flanges are all the way at the rear of the trans, not the front. This type will not bolt up.

Please excuse me if I repeat myself - I want to make sure I cover everything.

The 5-speed trans will bolt up directly to the bellhousing on the back of the torque tube. The mounts will be in the same place, as will the shifter and the driveshafts. Make sure to safety-wire the bolt that holds the shifter in place.

I'm not sure what you'll end up with for exhaust mounts, but I believe the rear exhaust mount from your car will bolt on to the rear case of the 924 trans. If not you may need to get creative!

The only detail from above that is different if you were to swap in a 4-speed would be the shifter rod - the one that connects the shift lever to the transmission. On a 4-speed it is a different length (longer as I remember), so you would need to make sure you get that as well as the transmission and coupler from the donor car. Otherwise the shift lever would be too far back to stick through the hole in the center tunnel.

Good luck!!!

Vaughan Scott
'79 924 #77 ITB racecar
'82 931 Plat. Silver
#25 Hidari Firefly P2 sports prototype
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PostPosted: Wed Jun 26, 2002 1:55 am    Post subject: Reply with quote

Thank you Scott!
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