Diff leaking

[d510addict]

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.

[MicroMachinery]

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.

[Z-train]

Make sure the vent tube is clear of dirt & crap.Then wash your rear-end.That may cure it all by itself.

[datzenmike]

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.

[Z-train]

I've swapped to 140 synth.in all my vehicles and haven't had a weepage issue.

[datzenmike]

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.

[kelowg]

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