rear diff leaking

i have a 8.25 and there seems to be a small leak from the differential plug, is all i have to do is replace the plug or is there something else that could cause this problem?

Replace the plug, I did this on tuesday Plug (PN 5207-0428-AA) cost $4.49. Also the diff could be to full on the fluid, thus it heats up expands and push out and around the plug. Fluid level should be 1/2" below fill hole.

Use some teflon plumbers tape on the thread when you reinstall the plug.

it wraps on counter clockwise. :repair:

Plumbers tape won't help, its a rubber lug, they get worn and drip, if it bugs you , or you're losing lots of oil ...eg.... Jeep Marking it's territory , get another plug, cheap easy and painless.... :laugh3:

Check the hole, see if it's threaded. If it is, it will be either 3/8NPT or 1/2"NPT (I can never remember which) and that means you can buy a brass pipe \plug to put in there (for about a buck and a half.) Why brass? It won't rust, and it will last for-damn-near-ever.

I also quit using Teflon tape a while ago - if the threads don't seal on their own (which is why pipe threads are tapered) I use Teflon pipe dope instead. That way, I don't have to remember which way it winds, and I don't have it unrolling across the floor if I drop it. I also have more control over how much goes on.

Anyhow - the rubber plugs are to be avoided if you have the option. They were used not because they were reliable, but because they are cheap (the bane of mass-production.) You've got it now - make it reliable.

5-90

Yes they are cheap and dirty, a threaded plug is better, but all of the 8.25's I've seen aren't threaded, I suppose the "correct" way to fix it would be to weld on a good bung and use a pipe plug (higher up if you're lifted and have the pinion tipped way up) - I 'm not sure there is really enough material in the fill hole to cut enough threads deep enough to seal well.....

Ah - didn't know that. All I've got a D30 and D35, with a couple D44's in the back wanting work - and all of them are threaded.

Damn accountants - they should leave engineering decisions to Engineering!

5-90

If you weld the existing bung from the inside there is enough material to tap a NPT,"been there,done that".

Yeah that would make some sense, my own plan is to weld the original plug shut,(should be pretty easy to add a neat patch over that hole, and add a bung up a little higher.