Matt, that's a fantastic post. That is exactly the kind of field testing needed for real world comparisons.
I will be running basically the same combination of gears and powerplant in my 55.1 NAPCO. I may run a 261 instead of the original 235 though since I have one here. I have 19.5's, which were on it from the time it was upfitted, and between the 4.10/4.11 (not sure which tooth count(s) I have) I'm hoping for a much better top end than I'd have gotten with the 4.57's and stocker 15's. I'm sure there is a way to figure out if I'm losing anything to drag with the extra gears in the transfer case and front end, but it should still be an improvement. Now, what remains to be seen is if the Brownie Junior overdrive I found will fit between the trans and the transfer case. Fingers crossed. I am fairly sure it's about a 20% over (or under depending on which direction it's mounted) unit.
Last edited by BlueChipper; 04/01/2015 2:54 AM.
