moran75 Posted May 14, 2018 Share Posted May 14, 2018 Hi all I have a leak from my diff.. When i sort it out i'm thinking it makes sense to drain whatever is left and replace? I know the manual doesn't recommend doing so but under the circumstances and because of the age of the car it makes sense.. Anyway any recommendations for modern gear oil to use? Diff is a 3.23 , non posi. Thanks Kev Link to comment Share on other sites More sharing options...
Seafoam65 Posted May 14, 2018 Share Posted May 14, 2018 If it were my car I would definitely change the diff oil while you are in there, but I would use old fashioned 90 weight gear oil like what it came with when new. By the way, the ring gear bolts on these cars are known to back off and fall out, destroying the rear end gears. If you have the differential out of the pumpkin, be sure to check the tightness of these bolts while you are in there, and use loc tite on them when you go back with them. 1 Link to comment Share on other sites More sharing options...
1965rivgs Posted May 15, 2018 Share Posted May 15, 2018 19 minutes ago, Seafoam65 said: If it were my car I would definitely change the diff oil while you are in there, but I would use old fashioned 90 weight gear oil like what it came with when new. By the way, the ring gear bolts on these cars are known to back off and fall out, destroying the rear end gears. If you have the differential out of the pumpkin, be sure to check the tightness of these bolts while you are in there, and use loc tite on them when you go back with them. Good advice ? Tom Link to comment Share on other sites More sharing options...
slosteve Posted May 17, 2018 Share Posted May 17, 2018 (edited) Kev, last year I made the mistake of just adding some gear oil to what was already in the diff. I then drove the car about 1400 miles with that new oil coming out of every conceivable place on the rear end. Guess they didn't mix well. Anyhow, ended up pulling the diff and cleaning the old gunk out of it and replacing it with new 85w-140 as I live in one of the hottest places in this country. With a new gasket, it hasn't leaked a drop. BTW, that center section is very heavy; be careful. Steve Edited May 17, 2018 by slosteve add BTW (see edit history) Link to comment Share on other sites More sharing options...
KongaMan Posted May 18, 2018 Share Posted May 18, 2018 Life would be simpler if there was either a drain plug in the pumpkin or a removable cover. Link to comment Share on other sites More sharing options...
moran75 Posted May 25, 2018 Author Share Posted May 25, 2018 On 5/15/2018 at 12:52 AM, Seafoam65 said: If it were my car I would definitely change the diff oil while you are in there, but I would use old fashioned 90 weight gear oil like what it came with when new. By the way, the ring gear bolts on these cars are known to back off and fall out, destroying the rear end gears. If you have the differential out of the pumpkin, be sure to check the tightness of these bolts while you are in there, and use loc tite on them when you go back with them. i'm guessing they used mineral based oil back in the day - any harm/advantage in using synthetic? I see synthetics have all kinds of GL ratings as well, bit mind boggling....Might be easier to ask which brand / type would you buy?...Cheers, Kev Link to comment Share on other sites More sharing options...
KongaMan Posted May 25, 2018 Share Posted May 25, 2018 Lotta folks recommend the O'Reilly's house brand. Cheap, readily available, and safe for yellow metals. Link to comment Share on other sites More sharing options...
1965rivgs Posted May 25, 2018 Share Posted May 25, 2018 Kev, See post #2 Tom Link to comment Share on other sites More sharing options...
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