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ITC Racer
11-29-2006, 01:04 PM
I have a 90 CRX Si that I need to replace the trans on- bearings are shot on the diff, I believe and have a line on a nice used trans but the current owner is not sure what it was out of but believes it was a CRX Si. I found some detail on ID'ing the trans from the 92-95 Civics but not sure if this applies to these also.

Are the halfshafts different with the different sized bearings (35mm and 40mm- my 90 should be a 35mm)?

Is there a way on these trans- 88-91 CRX D series- to tell which trans is which and perhaps from which year?

Lastly, can an 88 Si trans be swapped into a 90 Si or are the input shafts (or something else) different also??

Thanks
bamfp
11-29-2006, 02:16 PM
One way to tell what trans you have is to count the input shaft splines for the clutch. There are two different ones. I do not remember what they are. If it is an Si trans then it should have the bigger bearings. The 92-95 civic trans internals are different.

Blake
tcav52
11-29-2006, 05:28 PM
The 88 trans can be used. However, it does have a different number of splines than the 89 / 91 trans, so the clutch / pp assembly must be for an 88.
Limey
12-01-2006, 09:31 AM
If that transmission turns out not to be the right one, I have a stock 90 civic Si tranny sitting in my garage - let me know. I also have another tranny with 4.7FD and Quaife........but that's going in my car.... ;-)

Cheers, Mark
racer-025
12-21-2006, 01:13 PM
88-91 CRX Si gearboxes are interchangeable as complete assembly including clutch & flywheel*.

*
88 has 21 splines on the main shalf and the clutch is 7-1/2 dia"

89/90/91 has 20 splines

89 has 7-7/8" dia.

90/91 has 8-3/3" dia.

All axles will fit except HF/Civic CX 4-speed models.
ITC Racer
12-22-2006, 01:12 PM
Thanks for the info.

Mark- will let you know if I am in need of a different trans.

Anyone rebuilt one of these trans? Is it difficult to do properly?
ITC Racer
01-11-2007, 01:08 PM
Anyone know if the front case of an 88 CRX Si trans is interchangable with other years of the same generation?

Also, will a mainshaft from a 90 CRX Si trans be installed in an 88 CRX Si trans?

Thanks