no the seal between the tcase and tranny are fine. thats not leaking. what is leaking is where the 2 case halves meet together, and where the yoke housing meets the tcase. a frined of mine told me that permatex makes RTV specially for gear oil..i bought ultra black RTV but knowing that this gear one is made specifically for rear diffs and gear oil, then i will be returning ultra black to get this one. my front diff is leaking also so ima have to change my 2 diffs and tcase fluid this weekend..hope it all goes good and seals up!

 

what kind of gear oil should i use for my axles d30/c8.25?

 

I used blue no leaks first time sye recommend black/gray stuff leaked .Standard gear oil unless its limited slip.

 

no limited slip or anything like that. just open. and sorry if this is stupid question but whats standard gear oil? i bought advanceautoparts brand tranny oil for my tcase.

btw thanks for the help guys!

 

85w90 name brand .Try and avoid auto store brands all together. Valvoline,Castrol theses types.

 

what name brand do you recommend? and the 85w90 is for both axles right?

 

I use Castrol. And yes both axles.

 

alright man sweet. thanks for the help

 

I believe the weight is 80-90 on the gear oil.

Miles

 

80-90 85-90, really not too big a difference. That's the weight you wanna use (unless you tow anything, in which case you want 75-140 or 85-140).

I use Mobil 1 in the rear and Lucas in the front

 

any of you guys use the permatex gear RTV? would it be better to use than black? specially made to be used when resealing diff covers, should be the best for the tcase then i would think?

 

I just use the Permatex black stuff. Works well on the diffs. Haven't done it on the tcase.

 

I usually give the rtv gasket a day to cure before filling te case back up with fluid. So if you're not allowing any cure time, that maybe the issue.