You'd think this would be an easy thing to find the correct answer to but it seems as though I've been searching a long time now and can't find the answer I need. I just bough my 2004 Silverado SS with 60k on it and want to do a fluid change in front/rear diff and tranny. I'd like to use amsoil product in all just want to use correct weights. For the diffs, will Amsoil severe gear oil 75w90 synthetic be good for front and rear? If so do I need to add a modifier for limited slip? Please be specific with answers as it seems everywhere I look everyone is very vague. As for tranny now, do I do a service or flush? What fluid do I use? Someone please just call if they have the right answers. 860-601-1138. Thank you
