Thread: How To:Disassemble a B13 Transmission

I dont know if anyone has ever bothered with disassembling a B13 transmission. I know Coalition did a B15 trans, and its somewhat similar. I was "donated" a cracked transmission from fellow forum member Gee805 from when he cracked his trans at the line at the local dragstrip I had a spare tranny at my parents house with a blown LSD. So I took apart his transmission to steal his LSD and swap it into my otherwise good transmission. Disassembly is rather easy and should not take more than an hour to complete.

Tools needed:
10mm socket
12mm socket
snap ring pliers
a few flat head screwdrivers

First and foremost, we have the specimen..


Remove the top cover using a 10mm socket


Once the cover is removed, you will notice a snap ring that needs to be removed


pic from http://www.sr20forum.com/driveline-transmission/103882-disassembly-b15-p11-tranny-install-friction-type-lsd.html

We can now proceed to remove the 12mm bolts surrounding the bellhousing


The bellhousing is now ready to be separated, and this is what you will see. First thing, is to remove that rod that goes through the


Then remove the rod which holds the selector forks. It will pull right off, but be careful as there is a spring at the bottom that you dont want to lose.


Now, remove the gear selector mechanism held in place by three 10mm bolts


Next step is to remove the 3 bolt bracket located beneath the gear stack attached to the input shaft.


Once the three last bolts are removed, the gear stacks are ready to be removed simultaneously. Be careful with this because you dont want to damage any of the bearings and the rubber seal located on the bellhousing which seals the input shaft.


Now you will see this! The stock VLSD unit is just chillin there not attached to anything. Removing it is the easiest thing evar!!1!


This is the working LSD unit out of the cracked donor transmission that will be swapped over to my transmission.


Reassembly is pretty much the exact opposite of the disassembly.

This is a good thing for those of you who have a crap load of spare trannies laying around with miscellaneous problems. You can essentially build a good transmission out other busted ones. Its nice to have it as a spare just incase.
I know this write up isnt all that great, but i hope it somewhat helps anyone who is going to attempt to repair their own transmission

Can u point out wich one is the 5th gear my tranny has that problem i might do it myself.

Or can u post up pictures of ho to do it? Please thats if u have a tranny all ready dissasemble. I need to do this soon so i can get on the freeway.

Your car has 5th gear popout? It is probably easier and cheaper to replace the whole gearstack. Let me know, i have a perfectly good one laying around

I did an instrructional DVD for this once. No one wanted to buy it.

^i guess no one messes with b13 trannies

i have an lsd and non lsd trans in the garage...one has 5th gear popout and the other is lacking lsd lol. i'll be able to swap their 5th gears right?

check the notches in the gear teeth. there are 5th gears with one or two lines. do not mix them....bad things happen.


you should always try to set the proper bearing preload whit the right shim when changing diffs/bearings between cases.

EDIT Knowledge pwns me

NOTICE!!! count gear teeth, non-lsd appears to have 1 tooth fewer than lsd in gears 1-4, while the input shaft side w/ 5th gear is the same, i am having the craziest time trying to fix what i have done after swapping non-lsd gear stacks into my lsd trans

Yo, can you fix the bad links on the pictures pleaaase?



Do you still have any for sale?