12 Bolt Rearend Lube?

[Whalen3186]

Alright, we are changing gears and would like some input on what is the best, least resistance, gear lube everyone is using these days. Thanks! Drew Whalen

[Dragsinger]

I saw this post earlier but wanted to give some thought to my comments. I suppose, this issue would be difficult to test.

However, Good gear and bearing life can be had with a premium GL5 rated 80/90 conventional gear oil. But ,the same can be said for a premium synthetic oil. I think personal preference might be hard to separate from fact about gear oil. Much like it is with engine oil. [smile]

Also, For the 12 bolt housing, one quart is plenty of oil for drag racing.

[Dave Goob Cook]

I have always been a GL-5 dino oil guy myself, but was impressed with the Red-Line "climbing gear lube" that one of my customers has been using. Talking about a Pro-gear, car running 8.60's at over 3200 lbs. He gets 300+ runs from a gear set.

My only ever gear failure was with synthetic lube, can't remember right off which brand, and I feel it had nothing to do with the failure, probably just a fluke that it happened that way. I use street gears in mine, with minimal backlash. I tried the synthetic for off the trailer bracket racing consistency, did not discern any advantage or disadvantage. Seems to make more difference with the Phord and big Dana units.

[Chris Cogan]

Amsoil Severe Gear 75W-90 is my personal choice. Amsoil formulates an outstanding line of lubricants, especially gear lube. http://www.amsoil.com/redirect.cgi?z...storefront/SVG

There are some gear lubes out there that flow like 20wt motor oil, but I've never personally tried them. Anyone have any experience with these "qualifier' type lubes?

[sst1988]

Red Line......Shockproof Light, never had a problem with this lube.

[Alan Roehrich]

We're using the Richmond blue synthetic, or the GM synthetic. Cars roll free, and coast down slowly.

[Bob]

Joe Gibbs-Super Speedway Gear Oil or if you really need to go fast try their Qualifying Gear Oil

[Billy Nees]

Mark, don't underestimate the Dexron. I always used it in my bracket car (67 Camaro mid 10s @ 3400 lbs.) and it was always in Himes' Grand Prix (400 Pont. @4300 lbs.) and never had any problems. I might think twice about using it in a stick application though. Heck, Chrysler used it in all but it's highest performance applications from the factory for years.

[Ed Wright]

Originally Posted by Billy Nees

Mark, don't underestimate the Dexron. I always used it in my bracket car (67 Camaro mid 10s @ 3400 lbs.) and it was always in Himes' Grand Prix (400 Pont. @4300 lbs.) and never had any problems. I might think twice about using it in a stick application though. Heck, Chrysler used it in all but it's highest performance applications from the factory for years.

Please excuse an ignorant old man for asking this, but do you mean ATF in the rear end? I'm probably the only person on the planet that never heard of this.

[SSDiv6]

Originally Posted by Ed Wright

Please excuse an ignorant old man for asking this, but do you mean ATF in the rear end? I'm probably the only person on the planet that never heard of this.

ATF is considered a high pressure lubricant. Many cars, especially high end cars, run ATF in the stick shift transmissions and differentials. I have seen too many cars that have been serviced at "Quick Lube" type shops were the applicable ATF has been replaced with GL type lubricants and components have failed.