fluid question

[mollyman]

I have a 81 sub with a 350 th350 208. I just bought a 205 to swap in. My question is about fluids. I know the engine oil stays in the engine but I think I heard that the fluid will migrate between the tranny and tcase. Is this true? If so then I assume you should put the same fluid in both the tranny and tcase. What is a good fluid (if price isn't a factor)? Also since you are hear how do you know the spline count on the front output shaft? I know chevy had a 10 spline and a 30 spline version. I dont know the year of the tcase because I bought it loose (it will actually be delivered next week). Any help would be great, thanks!

 

[AJMBLAZER]

They shouldn't swap fluids if the seals and such are in good shape.

 

[shaun89]

ya, the adapter/connector shouldnt have fluid in it if the seals are good and for fluid, just use some say,mobile 1 or royal purple gear oil, and to tell if its a 10 or 32 spline(i think 32 is the number) just look at the shaft that goes from the tranny to the T case. im not 100% sure but i believe the 32 spline tranny/t-cases dont have the collar to connect them like the 10 spline does.

 

[mollyman]

thanks for the info so far but I am not talking about the spline count between the tranny and tcase that is 27 spline because I have a th350 trans. I am talking about the front output shaft for the front drive shaft.