put Red Line MT90 in the trans and 75-90 in the diff, now the trans seems to be running much hotter than usual, yes i filled it to the fill hole....before i was running mobil 1 75-90..any ideas? same experiences?

 

I changed from generic 80W-90 to Redline 75W-90 and didn't notice any excess heat in the tranny or diff. I did notice a .1 second reduction in my car's 1/4 mile ET though.

 

i think i know my prob now