A855 - 5 Speed

matthon said

I've given my thoughts on lack of communiating the fluid type change already, but now I'm thinking they changed something in the trans to go from calling for a gear oil for limited slip differentials to one that is not.

It didn't make sense at the time to put differential fluid in a manual trans, and I'm no expert, clearly.

The entire gear oil sheet is questionable.
It was in a plastic bag stapled to the inside of the crate, the only thing with it.

What a mess I've gotten myself into.

Click to expand...

Based on my e-mail discussions with Bill Fuss of GFI back in early 2018, I questioned why they were specifying a GL5 lube - which is used in differentials. It seemed they were just following recommendations from Lucas to use a GL5 (differential )lube. After I pointed out that a GL4 (transmission) lube has totally different friction modifier additives, they appeared to change the recommendation to use a GL4 lube. As far as I know, they did not change the internals. Bill sent the attachment to me about the differences in the lubes.
This was the last e-mail I got from Bill in May 2018.

Jim,
Thanks for your input on this. We used the recommendations of the local Lucas salesman and it now seems obvious to us that we had better choices. We are reviewing your results compared to history and will give updates to our break-in procedure for future units.
Again, thanks for your input and please share future observations with us. Your professional talents concerning oils are appreciated.
Best regards,
William Fuss (Bill)
Garrett-Fuss, Inc.