hrubago

Looking for more infos about 95 WRX RA rear differential.

- Which final drive ratio?
- which type (LSD plate type or another?)
- link to other info sources?

Thx

Andy.F

The Ra's of 95 vintage have 3.9 diffs and ultra short gears.
If the box has a centre DCCD the rear diff will be plated, if the box has a viscous centre LSD then the rear LSD will also be viscous.

Andy

hrubago

Perfect.
Thanks a lot.
You saved my money :-)

911

Good grief Andy, you should write a book on all these details. Now I've sorted my RA trans out I think it is a 92/94 unit as the rear isn't plated and it does have a 4.111:1 ratio. Presumably it makes it the shortest trans made by Subaru?
I just hope it makes the car faster.....

Would like to give you a public thank you for all your help.

The learning curve on Impreza's is bloody steep, makes 911's easy by comparison!
Regards. Graham.

hrubago

Standard final drive ratio on STi is 4,44:1.

Short gearing on RA is probably done by gearbox gearing.

Andy.F

The 95 Ra has a 0.972 5th gear. Thats exactly the same ratio as a UK cars 4th gear.

Andy

911

hrubago, try to get the Haynes Subaru Impreza book by Chis Rees, it has stacks of detail on all the cars all there, not perfect, but a good guide.
Graham.

911

Andy, or anyone else:
If the RA trans has NO manually adjustable center diff, therefore only an LSD in the rear, can I keep the abs in my STi which will soon get the RA trans?
Graham.

Andy.F

Yes The ABS is worth retaining for wet meetings in my opinion.

911

Thank god for that, didn't fancy doing the brakes as well as the trans!
Must try harder as in the dry I can't get the ABS to come in while diving into a 90 left (too fast). Sometimes I wonder if its working...
Thanks again Andy, regards, Graham.