Are the S4 and S5 transmissions the same? I'm wanting to put an 89 N/A trans into an 88 N/A. Is there any real compatibality issues? Exhaust, driveshaft or anything?

 

They will interchange, youll need the front counterweight, flywheel, clutch, pressure plate from the s5. I believe the s5 has a taller overdrive/5th gear

 

are you SURE about that because the S4 and S5 (n/a) trannies I had laying around here at one point (the S4 is gone now which is why Im asking) but I am pretty sure that the spline count was the same for both tranny's......

 

Yes are you sure? I'd like to know what I'm doing before hand!

 

just checked, had my trannies mismatched in my head


just swap the trannies. keep the flywheel , clutch, pp for the block

 

So would it be easier to swap trannies or swap motors? I know that would involve changing computers and harnesses but....would it be easier than changing trannies without a lift and shop tools?

 

i was told that there is no difference as long as its a na and not turbo tranny. I had a s5 on my s4 motor and in ran great till i blew it then i just slap on a s4. i was told by my engine builder that the s5 is strong than the s4 and can take more hp.

 

they both will work i when from auto to S4 5pd to S5 spd no problem.

 

I have done this swap, s5 n/a into s4 n/a. The only thing different is the crossmember. Use the crossmember from the donor tranny.