hatrack48

can I put a y1 lsd into a s1 tranny. reason asking i have the s1 and can get the y1 lsd for a preety good price and not sure if it will work

Bone1

if the Y1 LSD has 10 ring rear bolts, yes......

Kalam

should work...the ring and pinion gears in a ys1 LS tranny are the same as the y1 b16 tranny (4.26 JDM b16 crx sir)....s1 is a 4.40 (JDM b16 xsi integra)

Bone1

so your saying 4.266 FD and 4.400 FD are the same.........

I beg to differ.........

Kalam

my bad i edited i may have the s1 and y1 backwards on the FDs but i think that's right....however i do believe all the b series cable tranny diffs and FDs are innerchangeable...i changed the final drive and diff in my b16 from a 4.26 to a 4.40....bolted up fine....

0b00st0

Yes, the countershafts have the same number of teeth (15) for both the 4.266 and the 4.400 FD.

Bone1

same number of teeth, but different parts.

the teeth are cut at a slightly different angle and they won't mesh.

Same thing goes with the 70/16 4.25 and 71/16 4.437 D series FD's, the parts are different.

0b00st0

How much different?

Bone1

enough the gears would be wiped out in 2-3 miles.........

BLACKSI

what is the final drive on a j1? same with shorter gears? all my spare s1 and a1 trannies are 4.40. guess i'll have to take my j1 apart to count the fd teeth