Thread: General Transmission Information and Swapping (B13-P11)

So by now a lot of us have figured out the early transmission are not as strong as the new B15/P11. But I'm curious is to what makes them so different. I am also interested in if you can swap the stacks from the newer to the older, or even just the gears. I'm now going on my 3rd transmission and it's getting old fast. I do not have the funds to fork out $1000 for the newer ones so I have to settle for the older types.

Now my questions.

1. Can the newer gears be installed in the older cases in any way? What makes them so different if they can't? Can the gears be swapped onto the older shafts?

2. What makes the newer gears so much stronger?

3. If you have a Newer non-lsd transmission, can you swap the differential into them from a LSD one and have it work like that? Or are the cases different like the older style also?

4. Can non-lsd older style be swapped into the lsd style case with the lsd differential without a problem? (assuming this can be done)

5. WHY does no one make anything for our transmissions!?! haha

Might have some more questions later. And if this information has been covered else where, which I think the stronger part on the new transmissions has been I'm sorry.

I feel your pain. I just blew up my transmission a week ago which makes.
#2 in two years :-( both times shifting into third at over 5k rpm.

I know that info is splattered around here and the old forum. Hard to find though sometimes.

No.

The length of the shafts, the distance between the shafts, and the orientation of the gears on the shafts are different. Everything is different. Reverse is somewhere in the center of the stack I believe.

Not likely. And that won't help you at all.

The gears are not stronger. If they are, it's not important.
The older transmissions fail when the side loads from the helicoidal gear set spread the gear stacks apart and the gear teeth are only hanging on by the tips of the teeth. The gear teeth shred. 3rd gear is closest to the middle of the shafts which is why it fails most often. The cases also flex a bit which makes things worse. YOu can hold a tiny bit more torque if you weld or strengthen the case some, but it's not a real solution.

The new transmission has shorter gear stacks to resist spreading. They also use reverse gear as a support for one of the shafts in the middle I believe. If not, it has a spring loaded shaft with a bearing on the end which supports the shaft in the middle. I forget which. I think it's actually both.

The rest of your questions I can't answer.

Ah I get it Ben, thanks for the info! I was thinking maybe the weren't such, duno how to say it, but so helical cut? More straight then the older ones.

B15/P11 tranny- why it's better than B13/B14 - SR20 Forum

That's the thread right there.

Thanks, still want to know about the rest, the last was just kinda funny lol

Bump, has no one done this?

if your talking about swaping there is a BIG thread on how to do it

Edit: I see your last questions are about LSD to non-LSD swaps and vice versa. I don't believe that's possible. I believe the transmission cases are different, even on the newer transmissions. I'm not 100% sure though.