.
Differential Fluid Change
Le Mans Master
Joined: Dec 2003
Posts: 5,727
Likes: 38
From: Fremont CA
Just did this awful job. Use the pump at Harbor freight, heck for the cheap price buy 2 and throw away the dirty one you used to take old oil out. Use a fresh clean pump to transfer in the new fluid, it will be easier to remove oil lube if it is warmed up first.
Pump@Harbor Freight: http://www.harborfreight.com/multi-u...ump-66418.html
Pump@Harbor Freight: http://www.harborfreight.com/multi-u...ump-66418.html
Advanced
Joined: Aug 2010
Posts: 67
Likes: 0
From: Chandler az
I make a drain plug I drill and tap the bottom for 1/8 NPT and let it fully drain and even pour in a half qt or so and flush it out and then install a allen plug so it sits flush. Works great its crazy GM did not put a drain in the case you will never get all the old lube out no matter what kind of sucking you do lol. The 81 and 82s are easy alum housings but the older cast iron ones take more work to drill but its a small hole so its not a big deal. I have probally done about 50 of them.
Safety Car
Joined: Nov 2008
Posts: 4,368
Likes: 9
From: Colorado
Just did this awful job. Use the pump at Harbor freight, heck for the cheap price buy 2 and throw away the dirty one you used to take old oil out. Use a fresh clean pump to transfer in the new fluid, it will be easier to remove oil lube if it is warmed up first.
Pump@Harbor Freight: http://www.harborfreight.com/multi-u...ump-66418.html
Pump@Harbor Freight: http://www.harborfreight.com/multi-u...ump-66418.html
Don't forget to add posi fluid !
Team Owner
Joined: Jan 2006
Posts: 37,637
Likes: 3,118
From: Crossville TN
Suck it out with a hose (as large as will fit through the hole so the thick fluid will come out easier) and a turkey baster or syphon pump. The better question is "How do I get that 30+ year-old 'frozen' plug out of the diffy?" If you can't get it out with an air-impact gun, you will likely have to drop the spare tire tub and tire, then use a 4 foot long iron pipe as a torque arm (w/the drive socket) to break it loose.
P.S. Put some anti-sieze compound on the plug when you reinstall it.
P.S. Put some anti-sieze compound on the plug when you reinstall it.
Thread Starter
Racer
Joined: Jun 2009
Posts: 409
Likes: 3
From: St. James, NC
Just did this awful job. Use the pump at Harbor freight, heck for the cheap price buy 2 and throw away the dirty one you used to take old oil out. Use a fresh clean pump to transfer in the new fluid, it will be easier to remove oil lube if it is warmed up first.
Pump@Harbor Freight: http://www.harborfreight.com/multi-u...ump-66418.html
Pump@Harbor Freight: http://www.harborfreight.com/multi-u...ump-66418.html
Thread Starter
Racer
Joined: Jun 2009
Posts: 409
Likes: 3
From: St. James, NC
Suck it out with a hose (as large as will fit through the hole so the thick fluid will come out easier) and a turkey baster or syphon pump. The better question is "How do I get that 30+ year-old 'frozen' plug out of the diffy?" If you can't get it out with an air-impact gun, you will likely have to drop the spare tire tub and tire, then use a 4 foot long iron pipe as a torque arm (w/the drive socket) to break it loose.
P.S. Put some anti-sieze compound on the plug when you reinstall it.
P.S. Put some anti-sieze compound on the plug when you reinstall it.
Thanks everyone for the help and suggestions
pat
Corvette Stories
The Best of Corvette for Corvette Enthusiasts
Top 10 Most Expensive Corvettes Ever Sold on Bring A Trailer
Brett Foote
10 Things Every Corvette Owner Needs (2026 Edition)
Michael S. Palmer
8 Most "Only Corvette Owners Understand" Quirks and Problems
Pouria Savadkouei
10 Reasons the C6 Z06 is Still A Performance Benchmark After 20 Years
Joe Kucinski
How Much Horsepower Every Corvette Engine "LOST" in 1972
Joe Kucinski
Top 10 DOs and DON'Ts for Protecting Your Convertible Top!
Michael S. Palmer
Top 10 Most Explosive Corvettes Ever Made: Power-to-Weight Ratio Ranked!
Joe Kucinski
150 hp to 1,250 hp: Every Corvette Generation Compared by the Specs That Matter
Joe Kucinski
8 Coolest Corvette Pace Cars (and Replicas) of All Time
Verdad Gallardo
Advanced
Joined: Aug 2010
Posts: 67
Likes: 0
From: Chandler az
It takes about 2.5 and 2 bottles of GM posi additive yes 2 bottles of the additive or it can chatter and mess things up. So I would not take any R/P lube back I would save whats left incase you have a seal leaking a little you can top it off once and awhile.
Burning Brakes
Joined: Dec 2007
Posts: 889
Likes: 0
...thx!!!
