Front and rear gear oil. Pics inside. Need help. - The 1947 - Present Chevrolet & GMC Truck Message Board Network

NASTY-LSX · 05-16-2018, 10:30 PM

during Harvey Water came up to the top of the bumpers for 4 days. Since August Of last year the truck has been driven about 50 miles. I started hearing
like metal to metal breaking. Pulled brake caliper off and the whole rotor slid right out LMMFAO. So after a complete rebuild including new rotor spindles I need to put new gear oil in. How much oil for front and how much for rear? I dont think i need to fill to top of drain plug, or do I?

NASTY-LSX · 05-16-2018, 10:32 PM

more

SunSoaked · 05-17-2018, 09:30 AM

Wow! Yes, fill it until it starts coming out of the fill hole. When its filled correctly there should be oil in the axle tubes, not full, but enough to keep things happy.

**hatzie** · 05-17-2018, 10:57 AM

I've heard just below the fill hole but I just fill it til it runs out. There's a special Kent-Moore SPX J-tool dipstick for the later model T800 & later light truck axles because some genius at GM decided the bottom of the fill hole needed to be above the actual oil level instead of the way it was for 60 or so years before.

80W90 GL-5 dinosaur juice in the front and 75W90 GL-5 dinosaur juice in the rear. The owners manual or service manual will have the dry fill amounts. It's somewhere around 2 quarts or a bit more.
No limited slip additive needed and absolutely don't use it if your RPO tag lists G80... unless you know there's an aftermarket limited slip diff installed in there.
Don't bother with synthetic oils in these axles.

Avoid gear oil that says Energy Conserving on the API seal if you have the optional GM Eaton G80 locker.

sweetk30 · 05-17-2018, 05:06 PM

sorry but me thinks the wheel bearing damage was way before the 50 miles after the flood .

if that had the correct amount of grease in the hubs and water got in then it would be gunky and slimy not dryed up and burnt to a crisp .

as said tho . 75-90 oil or 80-90 oil nothing special .

side note I would be checking other fluids condition after seeing this .

05-16-2018, 10:30 PM	#1
NASTY-LSX Registered User Join Date: Oct 2013 Location: HOUSTON Posts: 355	Front and rear gear oil. Pics inside. Need help. during Harvey Water came up to the top of the bumpers for 4 days. Since August Of last year the truck has been driven about 50 miles. I started hearing like metal to metal breaking. Pulled brake caliper off and the whole rotor slid right out LMMFAO. So after a complete rebuild including new rotor spindles I need to put new gear oil in. How much oil for front and how much for rear? I dont think i need to fill to top of drain plug, or do I? Attached Images

05-16-2018, 10:32 PM	#2
NASTY-LSX Registered User Join Date: Oct 2013 Location: HOUSTON Posts: 355	Re: Front and rear gear oil. Pics inside. Need help. more Attached Images

05-17-2018, 09:30 AM	#3
SunSoaked Registered User Join Date: Dec 2011 Location: Yuma Arizona Posts: 1,526	Re: Front and rear gear oil. Pics inside. Need help. Wow! Yes, fill it until it starts coming out of the fill hole. When its filled correctly there should be oil in the axle tubes, not full, but enough to keep things happy.

05-17-2018, 10:57 AM	#4
hatzie Moderator Join Date: Oct 2008 Location: Wentworth, NH Posts: 4,925	Re: Front and rear gear oil. Pics inside. Need help. I've heard just below the fill hole but I just fill it til it runs out. There's a special Kent-Moore SPX J-tool dipstick for the later model T800 & later light truck axles because some genius at GM decided the bottom of the fill hole needed to be above the actual oil level instead of the way it was for 60 or so years before. 80W90 GL-5 dinosaur juice in the front and 75W90 GL-5 dinosaur juice in the rear. The owners manual or service manual will have the dry fill amounts. It's somewhere around 2 quarts or a bit more. No limited slip additive needed and absolutely don't use it if your RPO tag lists G80... unless you know there's an aftermarket limited slip diff installed in there. Don't bother with synthetic oils in these axles. Avoid gear oil that says Energy Conserving on the API seal if you have the optional GM Eaton G80 locker. __________________ 1959 M35A2 LDT465-1D SOLD 1967 Dodge W200 B383, NP420/NP201 SOLD 1969 Dodge Polara 500 B383, A833 SOLD 1972 Ford F250 FE390, NP435/NP205 SOLD 1976 Chevy K20, 6.5L, NV4500/NP208 SOLD 1986 M1008 CUCV SOLD 2000 GMC C2500, TD6.5L, NV4500 2005 Chevy Silverado LS 2500HD 6.0L 4L80E/NP263 2009 Impala SS LS4 V8 RTFM... GM Parts Books, GM Schematics, GM service manuals, and GM training materials... 1973-1991 GM Light Truck Service, Unit/Overhaul, Wiring Manuals, Parts Books and Some 1968-1999 GM Service Training textbooks in PDF 1988-1998 GMT400 CK service manual project 1988-1993 GMT400 CK parts books. 1967-1972 GM Light, Medium, & Heavy Truck Service Manuals in PDF Please include at least the year and model in your threads. It'll be easier to answer your questions. And please let us know if and how your repairs were successful.

05-17-2018, 05:06 PM	#5
sweetk30 Registered User Join Date: May 2012 Location: horseheads,ny rust belt Posts: 2,794	Re: Front and rear gear oil. Pics inside. Need help. sorry but me thinks the wheel bearing damage was way before the 50 miles after the flood . if that had the correct amount of grease in the hubs and water got in then it would be gunky and slimy not dryed up and burnt to a crisp . as said tho . 75-90 oil or 80-90 oil nothing special . side note I would be checking other fluids condition after seeing this . __________________ 77-k30lb BIG truck build . 87-k30lb budget beater build . 85-k30lb the plow machine build . 85-c10sb summer fun toy . ----------------------------- HOLLEY SNIPER efi = worst case of p.i.t.a i ever had . EDELBROCK pro flo 4 = best deal going so far . love my setup works great.



Register or Log In To remove these advertisements.

Register or Log In To remove these advertisements.