Rear end Gear lube

[Mike Rietow]

Originally Posted by Dave Gantz

Hi Mike, just wondering, why?

I run US Gear, when I asked what they like to see in gear oil, they said GL-5 is the key ingredient drag racing.

Valvoline High Performance gear oil is GL-5

Valvoline regular gear oil is not.

Here's a mention in dragzine confirming they're recommendation. No technical terms though, I couldn't find anything other than this.

I just use $4.97 Valvoline GL-5 80w 90. Ford 9" Strange chunk, I've had several different gear ratios in. 3.90, 4.10, 4.33. 4.56, 5.00, 5.29

3200 lb 23 n/a sbc 1.27 60 ft

https://www.dragzine.com/news/lubric...r-in-gear-oil/