Quick question:

Trying to determine what's needed to convert a non-LSD gearbox to LSD. Archives search was inconclusive. A review of PET suggests the carrier between a LSD and non-LSD are not the same.

Why you ask?

I have LSD unit that is showing some issues with the output flange. Wondering if I get a replacement (used) gearbox if I can stuff in my LSD core or if there are other internal part swaps required.

Yes, I track the car and want the LSD.

 

My understanding is the output flanges are integral to either the non-LSD or LSD design.

Short answer: you can swap an non-LSD in with no problem; but you can't use the non-LSD flanges on an LSD differential.

 

So can you add an LSD unit to a non-LSD tranny with little or no modification? Sorry to hijack.

 

I had that done to mine, no problems what so ever.
Back lash has to be verified so i would recommend having it done by someone used to setting up differentials.

 

I just posted some pics/info on it if you search.

 

So...the "value" of an LSD unit is not the entire gearbox itself so much as the LSD 'insert'?

And...of course a correctly setup diffy assembly as noted by Phil?

BTW, I talked to the folks at Guard the other day (who rebuild LSD unit) and they thought that R&Ring a 951 LSD unit was about $400 assuming that the 'ramps' where still usable. According to them they most always are. I thought that was pretty reasonable.

 

What about the heat generated by the LSD through the friction of the plates? Is a cooler necessary or can you get away without?

 

I ran an LSD without a cooler (as did several Previous Owners of the same car) probably 2 dozen track days.
When I had my car at the track in April the guts of the LSD disentegrated. Every gear and shaft in it broke.
I think I'll run one with a cooler now.

 

Update: Information from Mike at Guard.

The carrier is specific to the LSD unit. It has a special cuts, markings, pins etc that tie to the LSD unit and trigger the friction plates.