Gear
 

So I am putting together a new 9? rear for the racecar?4.56 pro gears, spool etc. I have always run Royal Purple Synthetic gear lube but now my contact at Mark Williams is telling me to avoid synthetic and go with a mineral based 85-140 with a GL-6 rating. He is saying some of the gear manufactures are going away from recommending synthetics because it is not coating the gears properly. I was hoping to get the car out on Friday and the local speed shop stocks Royal Purple and Valvoline in the 85-140 but they are rated GL-5? What are you guys using in your rear, mineral based or synthetic lubes?

Did I really just ask that question!?!?!?

[:-bigeyes2-:]

Wanna see some pictures?
http://public.fotki.com/JoeGrippo/

I'm a proponent of Preparation H.Couldn't help it.


Ed F.
15 T/SA
Powered by
Social Security

A- G didnt do much good either !!

I hope they will replace that win light , on my side ! It looks like yours still works ?!

STK 2894

I went through basically the same thing when I had Richmond 4.10s put in my 12-bolt: Richmond said to use a GL-6 rated gear lube for superior film strength, but I couldn't find any other than Richmond's own lube. I looked into it, and back then the story was that the GL-6 spec was never fully adopted by the API. Now if you do an internet search, it looks like it has been declared inactive. Either way, it's going to be hard to find a gear lube that says GL-6 anywhere on the label (unless it's been repackaged for a gear manufacturer). For what it's worth, I believe I broke in my gears with Valvoline DuraBlend 80W90 and then switched to RP 85W140. I haven't looked at the gears since then, but everything seems OK.

~Pete
1970 Nova
12.653@105.43