[Risingson05]

So I thought I would report what I found out - when I finished my build last summer - I was wondering why the low speed chatter in the rear was coming when I was idling through the neighborhood ..

Was on the forum today and stumbled onto a rear diff fluid thread - some posted they added additive to amsoil severe gear 75/90 and eliminated the chatter and wine (which I don’t think I had whine going on at all) other than the low speed chatter everything else worked fine . Although I’ve ran the track and dyno and a lot of spirted driving this summer ..

So I called amsoil tech line today - told them my car make and model - asked them how much of their friction modifier additive do I need to add - they replied that I needed to go back to gm rear diff as they don’t have any diff fluid that was on par with gm #88862624 for the zl1 .. so today I drained it ,in my short summer the diff fluid was already pretty grey .. no metal chunks or anything and maybe 1/8 inch of grey goop on the drain plug .. put in gm rear diff but sad to say I won’t be able to drive it till spring .. wanted to put the right stuff in. Now so that in spring I don’t forget as I might get to excited and forget ..


Lesson learned I’m gonna stick with gm rear diff from now on .. hopefully this gets rid of the chatter at low speed and I didn’t hurt my rear diff ..which all my buddy that I’ve talked to said it be fine .. just my ocd driving me nuts lol


Oh btw sever gear amsoil says that it already has the additive in it ,so that why I never added any