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Username Post: Differential Fluid Change?        (Topic#359379)
mauryfrench 
Gold Supporting Member
Posts: 25
mauryfrench
Loc: Wylie, TX
Reg: 12-26-19
01-05-20 09:46 AM - Post#2783741    

Hello, all.

I took the 98 to my oil change place to let them flush the engine and the cooling system. I will start changing my own oil again since I can actually get under the truck (unlike the Sentra).

The receipt email actually suggests a differential fluid change. Does this actually happen? Or just another fluid that can be charged for to change? I had never heard of it.

Thanks in advance, and have a good NFC playoff Sunday.

Maury French
Wylie, TX
1998 Chevy ECLB 5.7 Vortec


 
454cid 
Valued Contributor
Posts: 3138

Age: 46
Loc: West Michigan
Reg: 02-18-12
01-05-20 11:47 AM - Post#2783752    
    In response to mauryfrench

I've changed mine several times. I have almost 300K miles om my truck. It's not something you would need to do very often.

It becomes more important if you've been through deep water, especially if the vent or vents in the case of a 4wd are cracked/broken/missing as it makes it easier for water to get inside... they aren't sealed.

Always remove the fill plug first!

The rear involves removing the cover, which involves scrapping the old gasket... so that's kind of a pain. The front is just a fill and drain plug, so it's pretty easy.

I would recommend that you get one of the plastic pumps that screws onto the gear oil bottle... makes filling really easy.

99 K3500 RCLB


 
rockfangd 
"7th Year" Gold Supporting Member
Posts: 2855
rockfangd
Age: 33
Loc: Utica ny
Reg: 04-13-10
01-05-20 03:58 PM - Post#2783765    
    In response to 454cid

I would change the fluid. Not because it was suggested, but rather if you dont know if it has ever been done.
I have seen many empty diffs from people that didn't even know fluid was supposed to be checked.
Its one of those things people forget until it grenades

Old School GM fan FOREVER


 
mauryfrench 
Gold Supporting Member
Posts: 25
mauryfrench
Loc: Wylie, TX
Reg: 12-26-19
01-05-20 05:19 PM - Post#2783770    
    In response to rockfangd

Thank you for the input guys; I have watched a couple of videos about changing the fluid and am going to add it to my list of weekend hide from the family projects!

Maury


Maury French
Wylie, TX
1998 Chevy ECLB 5.7 Vortec


 
mauryfrench 
Gold Supporting Member
Posts: 25
mauryfrench
Loc: Wylie, TX
Reg: 12-26-19
01-05-20 05:38 PM - Post#2783771    
    In response to mauryfrench

One of the videos showed a fellow repainting the cover, and I have seen spiffy (is that word still good) painted diff covers in the past. Does it have to be high temperature paint, or will any decent can of rustoleum do?

Maury French
Wylie, TX
1998 Chevy ECLB 5.7 Vortec


 
rockfangd 
"7th Year" Gold Supporting Member
Posts: 2855
rockfangd
Age: 33
Loc: Utica ny
Reg: 04-13-10
01-05-20 07:04 PM - Post#2783776    
    In response to mauryfrench

Good rustoleum will do.
No high temp needed

Old School GM fan FOREVER


 
Ray P W 
Contributor
Posts: 468

Reg: 09-30-15
01-06-20 06:40 AM - Post#2783804    
    In response to rockfangd

Maury,

To make that job easier I've made and welded into the rear cover a bung for a 1/2" x 20 tpi magnetic drain plug to make oil draining quick and easy.

Ray W



 
rockfangd 
"7th Year" Gold Supporting Member
Posts: 2855
rockfangd
Age: 33
Loc: Utica ny
Reg: 04-13-10
01-06-20 06:24 PM - Post#2783860    
    In response to Ray P W

Same here with the drain.
Only kicker is in NY you have to replace the cover and install a plug

Old School GM fan FOREVER


 
YOUNG57 
Frequent Contributor
Posts: 1179

Loc: Tennessee
Reg: 12-06-10
01-06-20 08:47 PM - Post#2783880    
    In response to rockfangd

Many manufactures recommend changing differential gear oil every 30k miles, some at 50k. I change mine every 50k.

I simple remove the bottom and loosen the top cover bolts and ply open the bottom just enough to let the gear oil flow out and let it drip dry. I don’t remove the cover, disturb or replace the gasket but just wipe dry and button it back-up and have never had a leak.

If you feel you need a drain plug you could drill and tap the bottom of the thick differential casting for an 1/8” or ¼” pipe plug.




 
mauryfrench 
Gold Supporting Member
Posts: 25
mauryfrench
Loc: Wylie, TX
Reg: 12-26-19
01-07-20 07:05 AM - Post#2783909    
    In response to YOUNG57

So Young57, I assume you then have the real gasket and are not using permatex?

Maury French
Wylie, TX
1998 Chevy ECLB 5.7 Vortec


 
YOUNG57 
Frequent Contributor
Posts: 1179

Loc: Tennessee
Reg: 12-06-10
01-07-20 06:41 PM - Post#2783952    
    In response to mauryfrench

mauryfrench, that is correct, they have been the original factory gaskets in a 2003 Tahoe I put over 200k miles on and my 2014 Yukon with just over 100k miles.

After it stops dripping I wipe dry the gasket and cover surfaces and button it back up.




 
mauryfrench 
Gold Supporting Member
Posts: 25
mauryfrench
Loc: Wylie, TX
Reg: 12-26-19
01-15-20 07:33 PM - Post#2784456    
    In response to YOUNG57

Thank you sir. Got hung up on a work issue for the last two fricking weeks and am just now up for air! Looking forward to using some comp time from work to spend on the truck.


Maury French
Wylie, TX
1998 Chevy ECLB 5.7 Vortec


 
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