ED, GM F14 rear axle entails changing the entire rear axle housing.
Dave, the Patrick kit is for a 1/2 ton won't fit the HO52/72 axle.
OOp, Bill beat me to it on all fronts, just what I would have posted.
The 4.10 gear is a nice gear for the "stock" 3600. You don't
want to be driving that truck 70mph with the stock suspension
and brakes, it's not a modern truck with modern suspension.
I cruise 55mph much of the time and she's running turning right
around 2800rpm. Right around the sweet spot. She will run 60-65
with no problem but then you're getting over 3000rpm and you
don't want to run them there for to long. The stock 216 babbett
pounder was fine there, when it was new that is, but most are a
little to tired to push that hard.
Denny Graham
Sandwich, IL
Last edited by Denny Graham; 08/18/2013 1:18 PM.