Rear Gear Lube - Synthetic Or Conventional?

[Rory McNeil]

Originally Posted by deuces wild

Redline heavy duty shockproof in my Dana no problems.

Same here, (and light shockproof in the Jerico)

[Brett C]

We run all Strange products with Royal Purple. Never had an issue. (Knock on wood)

[ATI Performance Products]

Originally Posted by Brett C

We run all Strange products with Royal Purple. Never had an issue. (Knock on wood)

We have run Qualifying Driven oil in the Challenger Rear with no issues and a 4.88 until I went to 3470+ lbs. At 3250 no issues for 2 season. At 3470 we hurt gears. They are not Pro Gears and its only an 8 3/4.....so keep that in mind.

Switch to the Driven's Speedway Synthetic oil in Challenger and have always ran in COPO with no issues. Its VERY light.....

I do break in for 3-4 passes with No Synthetic Driven Break in or Torco oil from Mark Williams.

As far as an A to B to A test - never done - doesn't matter since I won't run a light weight non synthetic in the rear or trans anyway - we have enough other **** to test when we go out!

[THE LEGEND]

Amsoil Severe Duty for me

[Shawn Blair]

Originally Posted by ATI Performance Products

We have run Qualifying Driven oil in the Challenger Rear with no issues and a 4.88 until I went to 3470+ lbs. At 3250 no issues for 2 season. At 3470 we hurt gears. They are not Pro Gears and its only an 8 3/4.....so keep that in mind.

Switch to the Driven's Speedway Synthetic oil in Challenger and have always ran in COPO with no issues. Its VERY light.....

I do break in for 3-4 passes with No Synthetic Driven Break in or Torco oil from Mark Williams.

As far as an A to B to A test - never done - doesn't matter since I won't run a light weight non synthetic in the rear or trans anyway - we have enough other **** to test when we go out!

I don't know that it's an oil issue. I bracket raced my Dart with the 8 3/4 for ten years at around 3250 lbs. When I started running it in SS/JA a 3470+ lbs. I took teeth off the gears three times. I switched to a Dana, haven't touched it since and I'm running the qualifying oil. IMO it's more of a gear strength issue and I don't think it would be an issue if pro gears were available for the 8 3/4 in the ratios we need them. Just my 2 cents

6383 SS

[Dave Noll]

This is my first go around with Redline in the diff.. Using super light shock proof, I'm @ 3650 w/me but I'm slow. 5.14's in a 9".