Author Topic: Axle gear oil weight question. 85-140 VS 75-90 (Read 2328 times)

supermoto917 · « **on:** Jun 25, 2020, 12:41:54 PM »

Having my rear wheel bearings done right now and the shop guy was telling me I can use 85-140 and I should be fine. I normally just put 75-90 . Will the thicker viscosity cause seals to blow or will if be fine?

RUGER · « **Reply #1 on:** Jun 25, 2020, 12:52:00 PM »

ive always used 80-90. ive never heard of oil weight causing a seal to go bad. the bearings are a press fit to the axle and are sealed. the axle seal is there to keep oil from leaking out and other stuff getting in.

RUGER

RUGER · « **Reply #2 on:** Jun 25, 2020, 01:01:03 PM »

what year is yer rig.
mines an 83 but my rear axle is from a 86 to get a wider stance. those are both semi full float axles. if its newer i dont know since ive never played with those.

RUGER

supermoto917 · « **Reply #3 on:** Jun 25, 2020, 01:19:07 PM »

I have a 95 4Runner but axle off a 3rd Gen 4Runner (elocker) factory calls for 80-90. Asked a few gear and transmission shops and told it should not harm anything but just making double sure for I don't want to pull the rear wheels off again if I blow oil seals.

mudmaster · « **Reply #4 on:** Jun 25, 2020, 01:31:52 PM »

What Ruger said still applies.

RUGER · « **Reply #5 on:** Jun 25, 2020, 01:38:04 PM »

gear oil can make a mess and most dont like the smell. the seals are easy enough to replace. jack up rear axle. you dont even need to take off the tire but its easyer if you do. removed the 4 nuts holding the axle on, disconnect the break line and ebreak, axle slides out, id use a rag/gloves to hold the axle shaft since its got gear oil on it. the seal will be visible and dont worry about damaging it trying to remove it, i use a flat head screwdriver or a pick. once its removed clean the area with a rag. use a large socket and hammer to tap new seal into place. put things back together in reverse order. have someone help you bleed the brakes. $Beer Chug\'n$

but ive never heard of the thickness of oil blowing an axle seal.

edit: fergot to say to jack up the truck first haha

RUGER

supermoto917 · « **Reply #6 on:** Jun 25, 2020, 01:49:33 PM »

Thanks you fellas, I have a plan of attack now.

RUGER · « **Reply #7 on:** Jun 25, 2020, 01:56:20 PM »

you got it

RUGER

OVRAROK · « **Reply #8 on:** Jun 25, 2020, 02:25:22 PM »

Depending on climate..
For me having 75w90 gave me 1-2 mpg better on my fuel..

liveoak · « **Reply #9 on:** Jun 25, 2020, 04:15:01 PM »

I have run both also and while someone will prob say it's wrong, I now put 2 quarts of 75-90 and fill the rest with 75-140. I like to think I'm creating a 75-100 or something haha.

OVRAROK · « **Reply #10 on:** Jun 25, 2020, 04:36:36 PM »

I run this...
https://shop.redline360.com/products/red-line-synthetic-gear-oil-heavy-shockproof-58204-quart-or-58205-gallon?variant=30159543402576&currency=USD&utm_medium=product_sync&utm_source=google&utm_content=sag_organic&utm_campaign=sag_organic&gclid=CjwKCAjwltH3BRB6EiwAhj0IUNCO1W0crdx0-ppCxlhVQQbUR4nR1IuV5ZEeS7_9YhQb2G6hcD4jeRoCHXcQAvD_BwE

cbeers · « **Reply #11 on:** Jun 25, 2020, 04:48:40 PM »

me too

CB

Gnarly4X · « **Reply #12 on:** Jun 26, 2020, 01:55:23 AM »

Quote from: supermoto917 on Jun 25, 2020, 12:41:54 PM

Having my rear wheel bearings done right now and the shop guy was telling me I can use 85-140 and I should be fine. I normally just put 75-90 . Will the thicker viscosity cause seals to blow or will if be fine?

80-90 or 75-90 is very standard. I don’t recall seeing a spec for 140 viscosity in a diff or for gear lube. If I lived in a very cold climate, I’d be running all synthetic gear lube and oil.

Gnarls.