Thread: B15 Tranny Carnage

Both my B13 and B14 transmissions broke rolling on throttle, and neither were at WOT. I figure those were just fatigue failures and their cycling from other times when I was beating on it shortened the fatigue lifetime causing failure.

I'm pretty sure it's because I was spinning at the top of third on the street and slammed it into 4th and it caught traction for a second and broken. If I had paused and shifted slowly I wouldn't be rebuilding this now, but I think my clutch was only a few track visits from being toast anyways.

Coheed, have you ever taken any of the gears off of the shafts themselves? I want to put my B15 5th gears on the QG18 stacks but I can't find anyone who has actually done it (other than a transmission shop, who wants a crap ton of money).

I might need a stack swap soon too, I think my poor adjust of my clutch cable has worn my synchronizers down to make shifting harder than it should be.

I pulled the donor tranny apart last night. Have a bunch of spare c clips and roll pins now .

Bunch of spare parts! :


QG18 Case off:


Fresh QG18 Gear Stacks (need to put the B15 5th gears on them still):


Messy work bench; I figured the yard drained the new tranny but I pulled the axle plug and flipped it on its side and whoops lol:


I'm gonna ask again, has anyone ever pulled the 5th gears off? Is it something that is easy to do? I have a press, and I was told transmission work is somewhat difficult but this is much easier than anything I have done (mainly because it's on a work bench).

JGY FLSD is on the way! I still need to know if anyone has any experience with pulling gears off of the stack...

Well, after a year, I finally put it the rest of the way together last night. Man I missed this car.

Good job man. Be careful with those transmissions.

I didn't end up changing the 5th gears because I was nervous, but I played around with the broken stacks and 5th was super easy to take off of the input shaft. I didn't try the main shaft though.

Use some 85w140 Valvoline Conventional Gear oil and I can bet you this trans will last a long long time. A lot longer than using a 90 weight oil. Shifts will be improved as well and you will feel the difference in the gear cusioning.

Better than shock proof? I had the Valvoline 80w90 Durablend in there when it went, any reason why you would run the conventional over the Durablend?

EDIT: Also, JGY DRAG FLSD on top of VLSD rocks for cornering! I figured it would push like crazy but it just kind of pulls through it and doesn't spin the inside tire very easily.