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8-3/4 Rear Fluid Replacement

wthalin

wthalin

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Looking to check and replace the gear oil in my rear end. Looking at the manual looks like I just need to take out the square plug and pump it out. Any tips on removing that plug? Only thing I had that would fit on it were some channel locks and it does not seem to budge. Any recommended tools or techniques here? Don't want to damage it if I can avoid it.

Also, do we have a recommended gear oil? I picked up some Lucas synthetic 75W-90.

Pretty sure it still has the stock 3.23 gears as I found the metal tag still on one of the bolts.
 
khryslerkid said:
If you have a Sure Grip you'll need a bottle of Friction Modifier and non synthetic is recommended.
Click to expand...
This is exactly what the guy that rebuilt mine said and he was pretty firm about it.
He's done 100's of them...
 
How do I know if I have a suregrip again? Does that have to do with how the rear wheels spin? Both of mine spin together when you rotate one side by hand.
 
wthalin said:
How do I know if I have a suregrip again? Does that have to do with how the rear wheels spin? Both of mine spin together when you rotate one side by hand.
Click to expand...
Lower one wheel to the ground and try to turn the other wheel. If you do have a SG in it, it should be hard to turn.....and of course, the car needs to be in neutral. And there should be a tag that says USE SURE GRIP LUBE on one of the nuts and don't forget to block the front wheels.
 
12" adjustable wrench will give you more leverage.
Mike
 
If you're having trouble getting fill plug out, just wait until you start pumping out old gear lube......
 
65wgn440 said:
If you're having trouble getting fill plug out, just wait until you start pumping out old gear lube......
Click to expand...
Yes if this is a troubling task, sell the car and get a new car with a warranty.
 
65wgn440 said:
If you're having trouble getting fill plug out, just wait until you start pumping out old gear lube......
Click to expand...
oihnygdf.gif
 
Last edited:
Drill and tap the housing near the seam for a 1/8" pipe plug and proceed with your service.
Mike
 
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