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Borg Warner 4470 Durability concerns/Cummins Swap issues.

yellowK20

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Would this Tcase hold up behind 425 HP Cummins/NV4500 in a crew cab Squarebody on 38” Toyo’s pulling a 20,000lbs 5th wheel ??
I’m not super Familiar with the 4470 , have been around them a lot but never seen one that was bad .

My NV4500 has a chevy Tailhousing on it , 32 spline so I’m limited on choices for Tcases unless I want to run a slip yoke .

Ideally I would use my Ford NP205 with a Long 32 spline input and a Advanced Adapters spacer But that would also mean using a clocking ring because Chevy had to go and be different with their Round 6 pattern ‍♂️

I have heard that you can redrill the face of the Ford NP205 to the Gm Round 6 pattern and that’s an option as well ( would still need the AA spacer to have room for the Tcase linkage)

The Nuclear option would be to run a Magnum box behind the NV4500 in to the Ford 205
Or I could avoid all this and keep the Chevy 60 up front and have to deal with the tight clearances that would only let me run a 4” exhaust. ( big enough for the power level , I just like the 5” sound more)
 
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My limited experience with the BW-4470 is that those K-3500 trucks that had them seemed to be trouble free even with pretty high mileage so that’s a good sign.
GM must have had good faith in them to use them in a lot of early 1-Ton IFS trucks.
 
Kinda my thinking,

It would simplify my swap , I just don’t want to put it in if it’s going to be a liability later.
 
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