88 RT4WD Tranny splines

91civicZC

Are the RT4wd Transmissions the same as the other civic models in that the 88 tranny is diffrent from the rest of the years, or does the RT4wd tranny have the same number of splines no matter what year it is?

SiWagon

All Civic's have the following spline count.
:arrow: 88=21 spline count
:arrow: 89-91=20 spline count
90-91=went to a 210mm P.P.(larger)

akiraboy

I have an 88 tranny sittin round, I should check this

91civicZC

Please do check.

I am unwilling to belive that the 4WD tranny is the same unless someone has checked this already.

I will need to know for SURE when I get my wagon!!

Haydz

Well we put the same motors in our cars so the splines pretty much have to be the same..

SiWagon

:shock: Go down to your local parts store.Ask for a '88 4WD clutch.SLOOOWly (remember there's only a single spline count difference)count the splines.

:arrow: Now ask for a '88 Civic(any except the wagon one you just counted)) clutch.Goto a different store if u want.Count the splines. :arrow: Now you'll have PROVED it 2 ur self.

Haydz

I understand the difference between 88 and 89-91... what im saying is the wagon shouldn't be any different to the civic in that respect.

91civicZC

I would have thought the RT4WD tranny might have stayed the same the whole way through the line, 88 through 91.

Interesting.................

SiWagon

I know.Mine's a '88 that I did a clutch job on.O

Other '88 Wagon onlies:ITR LC & lightest wagon.

nominous

I've got a G plate UK Shutle which makes it:
G 01 August 1989 31 July 1990

So. I should be 21splines yeah?
That means I can use a clutch from a later hydro box without any troubles. I sure hope so. I know the CRX owners here have trouble at times trying to find uprated clutches. Gonna suck if I can't get one cheap for the turbo :?


Oh, further reading:

For the RT4WD, use the RT4WD flywheel, clutch kit

That's from Pacifier about swapping a DOHC into the RT. Damn, so the clutch and flywheel is different to normal civic one? If that's the case am I sol as far as after market clutches ?

This looks like every other D series clutch I've seen:
http://www.hondacivicwagon.com/board/vi ... .php?t=880

Turbo_teg seems to have just used a ACT clutch not specifically for the RT?
http://www.hondacivicwagon.com/board/vi ... php?t=1248

Talk about using replacement flywheels:
http://www.hondacivicwagon.com/board/vi ... php?t=2124


Various posts talk about the throw out bearking being different.
Is that the only problem, so I can use any clutch with correct number of splines?

turbo_teg

ya theres differences for sure in 88 to 89 trannies i have them both sure enough they wont interchange.

nominous

But your clutch itself wasn't wagon specific, so any clutch with the correct number of splines ?

turbo_teg

yep

nominous

Thanks! Bring on the 4 puck :twisted:

curt

i have a 88 rt4wd and my motor and tranny are out so i can check the spline count to make sure.