d510addict Posted August 26, 2012 Report Share Posted August 26, 2012 My diff is leaking from somewhere near where the driveline connects to it and I am unsure on what seals could be bad. What is required to put new seals in it? Would I just be better off finding another diff? This is for a 71 521. Thanks, Derick. Quote Link to comment
MicroMachinery Posted August 26, 2012 Report Share Posted August 26, 2012 Seals are easy to replace. The pinion seal at the front of the diff is probably the one leaking. Unhook the driveline, and there will be a nut that holds the flange which attaches to the driveline on. Take the nut off, and the flange should slide out. Pull out the old seal and replace with a new one. Reassemble. Done deal. 1 Quote Link to comment
Z-train Posted August 26, 2012 Report Share Posted August 26, 2012 Make sure the vent tube is clear of dirt & crap.Then wash your rear-end.That may cure it all by itself. Quote Link to comment
datzenmike Posted August 26, 2012 Report Share Posted August 26, 2012 That bolt is ON there, about 200 ft pounds. Have the e brake on and someone hold the brakes. Use a 1/2" ratchet and a piece of pipe over the handle for leverage. You can pound a wood screw into the seal and pull out with vice grips. Had to do this on my 620 when I put synthetic gear oil in it. That stuff is sooooo slippery it will get past old seals. Quote Link to comment
Z-train Posted August 27, 2012 Report Share Posted August 27, 2012 I've swapped to 140 synth.in all my vehicles and haven't had a weepage issue. Quote Link to comment
datzenmike Posted August 27, 2012 Report Share Posted August 27, 2012 That can happen also. As soon as I did, about a month later it was 'wet'. So were the bottom trans case and the rear trans seal. Put new ones in and it was fine. Quote Link to comment
kelowg Posted August 27, 2012 Report Share Posted August 27, 2012 also make sure to retightened exactly to much spot(number of turns) or get new crush sleeve to get the right pre-load on pinion bearing. be sure to stack nut when done Quote Link to comment
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