i just bought a 91 legacy with a bad trans (awd) with 4.11 gears. i just got a trans out of a 93 legacy with 3.90 gears. do i have to replace the rear also. i know the trans splits power front to rear. any help would be greatly helpful.

i just bought a 91 legacy with a bad trans (awd) with 4.11 gears. i just got a trans out of a 93 legacy with 3.90 gears. do i have to replace the rear also. i know the trans splits power front to rear. any help would be greatly helpful.

 

yes if you put a 3.90 tranny in your car and it is currently a 4.111, you will also need to replace the rear diff with a 3.90

yes, why didnt you go for a 91leg tranny?

either way, there are PLENTY of 3.9 diffs around.

agreed. many cars with a manual had a 3.90, so those rear diffs are quite common.

 

 

if you don't swap them, your transfer clutches will burn out in very short order, and then you'll only have FWD.

thats what i thought just like a reg. 4x4 truck . i'll have to get back up to harry's u pull it for the rear. i got the 93 trans because it had the lowest milage the wagon was wrecked and it said on the window it ran and moved. it works good in fwd.

get the matching diff and you will be set. nice.

thanks for the info. getting the rear when i get back from va. the wagon still had the rear in it so i'll get that one.

what all rears will fit in my legacy wagon (loyale , brat ,outback) 3.90 w/ lsd in it

what all rears will fit in my legacy wagon (loyale , brat ,outback) 3.90 w/ lsd in it

 

if you are looking for a direct LSD swap in. You would have to find a VLSD from a 5 spd Legacy turbo 91-94. Other than that you'd have to "build" one from a turbo GL and those are hard to find now as well.

You should be able to use the rear lsd from an SVX, and change the ring and pinion for the proper ratio. SVX's are 3:54

thanks for the info. i didn't see any torbo cars at harry's so i'll prob. just get the one the trans came out of.