'69 rear end lubricant

[Gene T.]

I have a local Corvette friend that needs guidance on what lubricate should he use when he changes the rear end lubricant on his '69 390 hp 4 spd.

[Duke W.]

Re: '69 rear end lubricant

It's in the owner's manual and service manuals. Does he have one. What does it say?

Duke

[Gary R.]

Re: '69 rear end lubricant

All you need is non synthetic, 90 or 85-140wt, gear oil and 1-2 4 oz bottles of posi additive.

[Ralph S.]

Re: '69 rear end lubricant

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[Con X.]

Re: '69 rear end lubricant

I used these.

[Gary R.]

Re: '69 rear end lubricant

As have I and about 1000 others I rebuilt diff's for. I change it out every 8-10k miles. Now you have to get that 64 on the road!

[Owen L.]

Re: '69 rear end lubricant

I have a local Corvette friend that needs guidance on what lubricate should he use when he changes the rear end lubricant on his '69 390 hp 4 spd.

Buy the AC Delco differential oil #10-4016 (2 bottles) and Positraction additive #10-4003 (2 bottles) -- both available at your local GM dealer, local auto parts, Amazon, Summit, etc. Squirt 1/2 bottle of fluid into the diff, add both additives to the bottle, shake it a bit and empty the bottle into the diff. Add the second bottle until the fluid seeps out the fill threads. Be careful to use a long nozzle straw so that if it comes off the bottle it's not lost inside the diff housing...

[Gene T.]

Re: '69 rear end lubricant

Thanks everyone for the info. I have passed along all of these recommendations

[Duke W.]

Re: '69 rear end lubricant

My 1963 Corvette Shop Manual, page 0-7, states the recommended lubricant for the T-10 and axle is"

"Lubricate with SAE 80 or SAE 80-90 Multi-purpose Gear Lubricant meeting the requirements of U. S. Ordnance Spec, Mil-L-2105B."

HELP! Does anyone know where I can find some?

Duke