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DIY - Installing an LSD in your tranny

PostPosted: Tue Jan 22, 2008 7:02 pm
by stefan
I found this article in Dutch on Civic Club Holland, by member 'Gijs'
So I thought I'd translate it for you guys :)

But first I would like to share these links with you, as they contain a whole shitload of valuable information about the OBX diff and a few things that have to do with 'em.

http://www.honda-tech.com/zerothread?id=1752849&page=1

http://rbryant.freeshell.org/obx_washers

http://honda-tech.com/zerothread/1381146

http://www.sportcompactcarweb.com/proje ... x3_part_4/

http://www.raymondasia.com/cat_belleville.htm

There is a lot of information on these sites tho, be prepared to read for a couple of hours!

The tranny I used was a S20 tranny.

Remove the oil from the tranny.
Remove the speedo sensor and reverse switch.
Put the tranny on a block.
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After that was done, remove all bolts from the housing, 12mm socket.
Also remove the plug on top of the tranny, wich is square 3/8.
Behind it, you can see the retainer ring, wich you have to remove with a pair of pliers.
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Pull the small axle from the tranny wich is for the reverse gear sprocket.
After that, remove the two bolts from the reverse gear pitchfork, wich needs a 10mm socket.
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On the inside at the clutch side there is a locking bolt; loosen it.
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On the selector is also a bolt wich needs to be removed.
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Because your selector is now rotating freely, you can remove the 'towers' completely; just place your hand around it and pick it up.
Put it down in a way it stays together.
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This makes room to reach the diff, wich you can pull out by hand.
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You can remove the bearings with a press or pully remover.
I heated them a little, but you have to pay attention to the plastic speedo ring... plastic will melt.
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The diff used in this case is a really nice OBX type 3.
If it can handle 400hp, you will not hear me complain.
The new diff is 0.05 smaller compared to the old one.
This is important for your shims, because you'll only fill up the housing on the tranny side.
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Pressing in the new bearing; work CLEAN and press STRAIGHT!!
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The bolts from the sprocket (gear if you like) touch the housing a little, so these were machined to fit.
These have reversed thread btw; turn left to fasten, right to loosen.
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No shims today, the LSD is installed in a second.
Honda didn't place a shim as well btw.
Also, pay some extra attention to the bearings retainer for the secondary axle; these can need a little help.
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All together, take 2 hours for this fun job to do.

Hard to do?
On a scale from 1 to 100, this is a 70.
It's easier than you might think :)


Good luck and have fun!
Some day, I'll do this myself, I'll post my own findings here then ;)

PostPosted: Tue Jan 22, 2008 7:05 pm
by bietelboer
Hmmm i know those pic's from some where :lol:

PostPosted: Tue Jan 22, 2008 9:59 pm
by chrono404
Hmm... That seams somewhat Familiar ... :lol: I think i did something like that before.

Good information, However it would have been nice if it went into a little more detail.

PostPosted: Tue Jan 22, 2008 10:13 pm
by stefan
I agree :)

But this is all I've got, and it'll help you on your way.
If you don't understand what you're doing after reading this how-to, maybe you're not fit to work on your tranny.
Wich, of course, is no shame, not everybody is a technician ;)

PostPosted: Tue Jan 22, 2008 11:41 pm
by LowTEC-Derbo
the one thing I fear is when I get an OBX LSD, i might require shimming or sometimes there isnt need of shimming. This is the part that really makes me want to get a spare tranny to rebuild.

PostPosted: Tue Jan 22, 2008 11:43 pm
by stefan
That's probably a wise thing to do, so you can take all the time you want (need...) :)

PostPosted: Tue Jan 22, 2008 11:48 pm
by LowTEC-Derbo
i know there are a few versions of the obx laying in different stores. I just hope I get a ver 3 and dont need to shim lol

PostPosted: Wed Jan 23, 2008 1:54 am
by stefan
Ask the seller before you bid/buy :P

PostPosted: Wed Jan 23, 2008 3:34 am
by Greasedmonkey
I believe it was the first versions that needed to be shimmed.

PostPosted: Wed Jun 09, 2010 6:57 pm
by deschlong
Here also is a very thorough video DIY on installing an LSD in a B-Series transmission. Includes a step-by-step teardown and reinstall. Very informative.

http://www.evans-tuning.com/tech-videos ... fferential

EDIT: Updated dead link.