Automatic S13 SR20DET REDTOP INTO S15

[BUCKY01]

has anyone ever done this swap? i've seen the s15 swaps into s13's but not the other way around. i've tried searching on here and on alot of other forums and Google but come up with nothing. any help would be greatly appreciated.

[adrianfromthecastle]

anythings possible. Only issues I can forsee is the driveshaft and diff issues. Other than that, I don't see why not.

but I gotta ask.... why???

[BUCKY001]

anythings possible. Only issues I can forsee is the driveshaft and diff issues. Other than that, I don't see why not.

but I gotta ask.... why???

well i was planning on getting a driveshaft made by the driveshaft shop. couldn't i use an aftermarket diff or get an oem diff from an auto s15? i plan on building the car to 400+hp and it's for my wife.

[adrianfromthecastle]

well i was planning on getting a driveshaft made by the driveshaft shop. couldn't i use an aftermarket diff or get an oem diff from an auto s15? i plan on building the car to 400+hp and it's for my wife.

I believe the difference is in the driveshaft lengths. Actually, it just occured to me that you might be able to use the oe diff... just note that on s15's, the speed sensor is on the differential instead of the transmission like the s13 and s14 SR20s. So if you're using the s13 transmission, you might be able to get away without having to swap the rear diff (leaving it unplugged, or capping it).

I'm not tooooo possitive, so hopefully someone with more knowledge can chime in.