Compression Ignition Addict
Join Date: Dec 2007
Location: Taft, CA
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I think it is going to depend on a lot of things.
I dont think power is all of it, tranny is though.
I know people rave about the 210 tow power tune, which it might be good.
But like you just said, 7000# and the truck is down shifting.
My truck downshifts once with 18000# tall fiver, to hold the speed limit, 55 over 7% grades. Some of the grades the truck doesnt down shift, it just never gets into OD. Other grades the truck will just grunt over that it used to downshift stock.
With my car on a trailer, 7000# range, I dont ever remember the truck down shifting when going over the grades.
I am sure having a 450 changes things a little. My RPM at 55 in OD is just over 2000 to give you a comparison.
08 F450 4x4