Looking for shop recommendations

Possibly this 13 speed is a direct drive unit?? Or maybe running 19.5 tires or something?
I can’t see what 2.21 rears are going to be good for otherwise

 

Probably need to consider upgrading the drive shaft to because gears that high are going to put a lot more stress on the ds and u joints to climb a grade or accelerate unless this is being done to accommodate small tires or something

 

Hypothetically speaking, with that tall of a gear you won't even be able to get it in the big hole and probably end up with worse mpg to boot. Good luck starting out on any type of grade

 

If you're dead on it look for some 2.79 or 2.64

 

with a direct drive trans, not an RTLO, my 3.55s are bad enough have fun doing clutch adjustments every other week

manufactures have been back and forth on the direct/Od thing for years and if they could up their CAFE one tenth of an mpg by doing direct drive they would, when it comes down to it, it is still turning the same rpm, just now with a set of useless rears behind it

If you need rears or just want the write off I’d just put a new set of 3.25 in, which are already taller then I would want

 

call southwest truck parts in pratt ks .they have a salvage yard and a shop that works on trucks.