LSD
11-16-2015, 05:13 PM
#2
Rennlist
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"287" is the matching number with the pinion in that transmission. They are a matched pair.
"08/84" is the production date.
"75.00" is the pinion depth
"020" is the backlash in 100ths of a millimeter.
"08/84" is the production date.
"75.00" is the pinion depth
"020" is the backlash in 100ths of a millimeter.
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greg brown
714 879 9072
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Semi-retired, as of Feb 1, 2023.
The days of free technical advice are over.
Free consultations will no longer be available.
Will still be in the shop, isolated and exclusively working on project cars, developmental work and products, engines and transmissions.
Have fun with your 928's people!
greg brown
714 879 9072
GregBBRD@aol.com
Semi-retired, as of Feb 1, 2023.
The days of free technical advice are over.
Free consultations will no longer be available.
Will still be in the shop, isolated and exclusively working on project cars, developmental work and products, engines and transmissions.
Have fun with your 928's people!
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11-17-2015, 02:09 AM
#8
Rennlist
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Ring and pinions are matched pairs....never to be separated or run with another piece from another set!
If you change the differential in any transmission, both the bearing preload and the backlash will need to be adjusted, because the differential housings vary in distance between where the two bearings set and where the ring gear sits.
So, use the ring gear off of the '86, bolt it onto this limited slip (after rebuilding the limited slip), and set-up the preload and backlash.
Note: It is possible to very accurately measure the two differentials and set up the preload and backlash, assuming the '86 transmission is intact, properly set-up, and in good condition....I do this on a routine basis.
If you change the differential in any transmission, both the bearing preload and the backlash will need to be adjusted, because the differential housings vary in distance between where the two bearings set and where the ring gear sits.
So, use the ring gear off of the '86, bolt it onto this limited slip (after rebuilding the limited slip), and set-up the preload and backlash.
Note: It is possible to very accurately measure the two differentials and set up the preload and backlash, assuming the '86 transmission is intact, properly set-up, and in good condition....I do this on a routine basis.
11-17-2015, 08:24 AM
#9
Instructor
Thread Starter
Thanks Greg,
The '86 transmission is in good condition....(74,000 Granny driven miles).
That's exactly what I was hoping I could do.
I may be able to get the pinion from the donor transmission.
Would that be a better way to go?
The '86 transmission is in good condition....(74,000 Granny driven miles).
That's exactly what I was hoping I could do.
I may be able to get the pinion from the donor transmission.
Would that be a better way to go?
11-17-2015, 12:08 PM
#10
Addict
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You need to run your current r+p .... rebuild the slip with new friction discs and correctly set up the mesh dimensions.
11-17-2015, 12:31 PM
#12
Rennlist
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Switching the ring gear and setting it up is relatively simple. Installing a pinion requires completely disassembling the transmission, swapping the pinion shaft, then setting up the new pinion depth, and then still needing to set up the preload and backlash of the differential.
Way more work!
11-22-2015, 01:52 PM
#15
Three Wheelin'
Side question for the collective: is this a four or eight disk lsd? Unsure what MY the change was, did they change from eight to a four when the synchros were upgraded? Any why?