Truck just hit 4000 miles on the trip to work last night. So far I've towed a 8K trailer about 500 miles of that. Rest was freeway. I'm probably gonna have the rear diff done later today. Here are my questions.


When should I do the front diff? It's been in 4wd a total of 3 miles so far although those were all done in sand.


When should I do the spin on tranny filter and what is the part number?


What kind of lube is good for the diffs?


Thanks in advance.


Rich.

Do the front when you do the rear axle ..... It will be cruddy ....

At 5000 miles , then at 25 K intravels ,save the magnet clean and reuse ..... Filters are easy to come by at Allison Dealer or from Vendors here ....

I run Mobil Sny 75/90 ....

Mac