Diff seal

[328FTW]

The main tailshaft/pinion seal on mine leaks, nothing major just got that black spray stain around the diff from leaking and a mildly moist bottom. Is it just a press neoprene/rubber seal? Is there dimensions for it to buy a seal local or is the stealership cheap enough? If someone can tell me the stealership price they paid that'd be good.

I found a thread on how to do it with marking the nut etc but it didn't say anything about the seal itself or have a pic of it. Seems pretty standard live diff stuff. The axle seals don't leak just this one, no bearing noise or clunks so I just want this fixed. Down the track I might buy new parts to freshen the lsd but for now I wanna just deal with this so I'm not spending the cost of rebuilding a diff on good diff oil that I'm feeding to the tarmac in drips.

Kinda anal about maintenance Oh 1990 VN SS lsd btw

[mr calais 5.0]

I'm not sure what kind it is but if you ring auto barn, super cheap or repco they would look it up and tell you what it is and how much? Can you put the how to link up?

[328FTW]

Can't find the thread again but the basics are drop the driveshaft, pull things down, mark the pinion nut, crack free, undo, punch out seal, punch in seal then assemble carefully lining things up again. Should also count the turns on the nut coming off to.

I'd do it all right on the floor setting the preload but I'll reserve judgement on that till I've had a sneaky peek and poke around inside to see what the bearings are like. No noise and seems tight but I dunno. If it's loose in the guts then I guess I should think about a full rebuild then but if it ain't broke I ain't fixing it.

[328FTW]

Ok went to repco as my first stop just to start pricing up a seal. $6 and didn't even bother looking elsewhere, not worth the petrol. My dad has done old falcon diffs and the likes 1000 times and they are all much of muchness. Seems straight forward enough so might put it on the lift tomorrow and do a little write up of it with the seal size and everything for future reference.

[328FTW]

Ok so I forgot to take a pic of the seal in the housing but otherwise all is well. The size of the seal was printed on it and I confirmed with digital vernier calipers

Outside diamter: 66.62mm
Internal diameter: 42.06mm
Thickness: 9.7mm

Standard seal with the tension spring on the seal surface. I just could not find this info anywhere so anyone searching might stumble on this now.


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Now my diff oil looked less like diff oil and more like grease, been a long time cause there was lots of glimmer from worn bearing and friction disk. The seal popped right out with a screwdriver. How I did it was

Undid driveshaft (4 bolts)
Punched a mark on the pinion and on the nut
Removed nut (26mm socket) it cracked quite easily and the handbrake held things from spinning piece of piss
Undid the nut and counted the turns (10 turns exact on mine)
Pulled off the yoke
Pryed out seal
Put in new seal flat against face. IT DOES NOT GO ALL THE WAY IN, just flat against the diff face. I also oiled the surfaces of it so the edges wouldn't catch
Put yoke back in after checking for seal groove, was all sweet, put a little oil on it to to help.
Did nut back up exactly to where it was before lining up the marks at 10 turns and using loctite
Put driveshaft back on and loctite on the bolts

From there I cleaned up the diff scooping out the old crap in it cause as I did the seal I had the backing plate off with it draining. Put the backing plate in the parts washer and scrubbed the old paint off, painted the plate, put sealer on and put in in place hand tight.

Had beer

After about an hour I did the plate up tight on the new sealer then filled the diff up with nulon LSD oil. Cleaned up the disgusting mess from the leaking seal and wire brushed the stuck on crap on the diff that had caked up. Let it down off the lift then drove home, feel so much better now it's done cause it was pretty bad.





















Dunno if you can add tags here (edit: you can, too late ) but keywords for searches: leaking diff VN pinion seal non IRS seal tailshaft seal seal dimensions changing pinion seal servicing LSD diff