samiam4

So I'm here...

Looking at the redline line of fluids:

high shock, thin high shock, 75/90 w, 75w/110 and 75w140.

I'm sure all will work fine.. but any suggestions? I'm in texas so cold weather operation is not a concern. I was leaning toward high shock (75/90) or 110 or 140w.

Anyone here have a particular flavor preference?


Michael

edwinsmith

When I was a kid all that we ever got was 90W gear oil at the local gas station. Rear end and manual trans got the same stuff. Lots of sulfur in it. This multi-vis stuff is over the top IMHO. DON'T put it in your Get-Rag though.

It's also not very good in your hair as I found out.

KRB

75/90 Valvoline synthetic is what I have in mine, which I think is what it calls for. I would think 140w would be too thick?

NJTman

When I purchased my 1994 Toyota hilux pickup, the owners manual stated 75/140 for just about every part of the truck which required gear oil.

Since then, it's all I used.

The difference between multi-grade and straight-weight oil is simply the addition of a viscosity improving (VI) additive. The most common grade of automotive oil in use today is the 5W/30, which is a mineral oil refined with VI additives that leave it reading as an SAE 5W viscosity when cold, yet an SAE 30W when hot (210F). The advantage to the multi-weight is that when starting the engine, the multi-viscosity oil (with its thickness of an SAE 5W when cold), allows the engine to spin over more easily.


https://www.blackstone-labs.com/oil-viscosity.php

mknittle

I just put 75-140 in my transfer case. It quieted it down really nicely.

KRB

I checked the jug and what I have is 85/140. Been in there about 15 years (not same oil, just same grade). Sorry for the confusion.

sooty

amsoil synthetic 75/90 severe gear changed annually, for posi diffs, add friction modifier.

MrFusion

85-140 'cause I traded a case of Yuengling Lager cans ($20ish AND generally accepted legal tender here in PA) for 4 cases of Kendall 85-140 gear oil.

Guy I got it from was dumping it into his waste oil furnace occasionally to get rid of it!!!

samiam4

Decided to go with the 75w110. Make it quiet.

M

NJTman

Just so you know, Amsoil doesn't recommend the friction modifier for use with their severe gear products. I use the Amsoil 75/140 severe gear in the brick and my fuso, and I actually called them about the LSD in the brick needing the additive. They swore up and down that I would NOT need it, as it's already formulated in it. They told me to put it in straight, and forget about it. So I did.

Call them, and ask. See if they say the same thing to you.

j_martin

Had my differential rebuilt and they put in AmZoil and 1 tube of modifier. I then took a long road trip. About 800 miles into that it started chattering. With NATCO's phone support I put in another 2 tubes of modifier, one at a time before it settled down. It's been fine since.

I recently had a hard pull to do. Put 4 black streaks on the pavement getting the furniture van out of the ditch.

sooty

powerlocks are something, my amsoil guy dosent mind selling the modifier to me, ill check with them, but ive had no abnormal activity.