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I have a spare rear end from rotten Ralph. I’m cleaning up . From my research it may be a 75 with a76 11/37 gear set 407?. Here is all the numbers
case 3899143 67-79?
lr w 015 f1 lr=336 w=warren 015=jan1 75 ? F1 should be plant and shift don’t know who f is
build date l 25 dec 2-75 ?
now on the gears is a bit in clear
gm gear pack
3735390
11/37= 407?
1-76-1
So many question marks here who can steer me in the right direction ?
Looks like a stock diff, complete with cover and axles, out of the car market value is $250-$350. In stock form they had bad clutches, ring gear bolt torque, and axles. It doesn't appear to have been worked on, if so it's unimpressive, posi case needs to be checked for cracks, if cracked value drops to $100. Shipping costs are high now, UPS is going up 7% by the end of the month. I just shipped one from CT- OH, was over $150. Whereas it would have been $75 in pre-covid days. Coast to coast is over $200 now.
Looks like a stock diff, complete with cover and axles, out of the car market value is $250-$350. In stock form they had bad clutches, ring gear bolt torque, and axles. It doesn't appear to have been worked on, if so it's unimpressive, posi case needs to be checked for cracks, if cracked value drops to $100. Shipping costs are high now, UPS is going up 7% by the end of the month. I just shipped one from CT- OH, was over $150. Whereas it would have been $75 in pre-covid days. Coast to coast is over $200 now.[/QUOTE
Send me to 4grade math again 336 it shall be. thanks
Last edited by Redrocketremembered; Dec 6, 2022 at 12:00 PM.
The housing was cast on December 2, 1975 and as Gary has responded, the unit was assembled on Jan 15, 1976 which translates from the 015 Julian date stamped. The “F” is actually an “E”, signifying an Eaton Posi carrier. The “1” indicates built on the first shift.
Rear end identification
