Interesting problem you have there.

Some years ago - 1998 - I had my 88 GL manual tranny rebuilt locally and
afterward had a severely stiff shifting problem between 1st and 2nd
gear. I switched over to Redline MT-90 and have had no trouble since. I
have since replaced the MT-90 gear oil about four times, and it has
always been clean and red. It seems to be pretty good stuff. I have
80,000 mi on that tranny now and it is still performing well.

Regards,

John Rodgers
88 GL Driver

Geza Polony wrote:
> What's the best to cure a synchro ring problem that's been there since my
> rebuild last year?
>
> Ron at Ron's Transaxles, the SF Bay Area guru of these things, swears that
> the Redline in my rebuilt 4 speed is causing a scratch from 1st to 2nd, esp.
> when cold. He tells me to change the Redline to dino GL-4. Problem is, GL-4
> is hard to get. The Royal Purple site says their GL-5 won't damage synchro
> rings, and there are plenty who swear by Redline. I know this has been a
> subject of discussion in the past and have searched the archives, even
> finding another reference to Ron in 2003 who was then giving thumbs up to
> GL-5. But now Ron has changed brands of syncro rings and that, he tells me,
> is causing the problem with Redline.  An August 2003 post from Daryl gives
> the ok to Redline.  Dennis, Oct 2002, says Mobil 1.
>
> Main choices seem to be Sta Lube GL-4 and Redline. But Royal Purple is
> supposed to be good stuff for engines...
>
> Anyway this scratching from 1st to 2nd is driving me nuts. Ideas?
>
>
>