Suspension Upgrades
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From: Ohio
Well, camping season is almost here (already here for us, we are 600 miles from home in the TT right now!
) so go ahead and make a trip with the 34"s and 3.73s to see how you like that new 3.47 effective ratio. I pulled our old 9,500lb TH with our stock V-10 with the stock 31.6" tire's and a set of 32"s and it was a dog and would downshift if it ran over a shadow. But you may have a different experience with your combination, so give it a trip to decide, you won't hurt it but don't expect the same level of towing performance from it now, it seemed like you were not happy with how it pulled the inclines in the past, it should suffer even more there now. With those new 34"s and new 4.88 gears it should be a much better tow rig with a 4.54 effective ratio, that's a step deeper than mine at 4.39 effective and I'm very happy with how my 6.8 handles the 11,300 lbs TT. 
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Most of our towing trips are longer highway trips and there we typically see 8 to 9 MPG towing, with a best ever of 9.5 over a 420 mile tow home from Niagara Falls. On the trip to TN last Friday I wasn't as careful as I normally am with my throttle management (allowed it to downshift more climbing grades than I typically do) and in the cold, snow and rain saw 7.45 MPG over the 600 mile tow through the mountains of MD, VA and TN. Unloaded coming home from Columbus OH last August I set the cruise at 65 MPH and got 14.5 MPG over that 430 miles trip.
I don't have my notebook with all of my data in it for the RPMs at various speeds with the different tire and gear combinations with me on this trip, but a search under my name with "RPMs" should turn up that info. It doesn't rev as high as most folks assume, don't fear the gear!
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From: Ohio
This is my end result! V code springs in the front add a leaf in the rear (which so far I’m very pleased with) to level it out and some platinum f250 20 in wheels with 34 in tire. Put Bilsteins all the way around. The only issue I’m having now even after an alignment is bad wondering and steering sticking and not returning to center I have to force it back. Have all new ball joints as well as front hubs.
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2. if you want to post your before and after alignment specs I can likely sort out the wander.
3. what PSI are your tires set at ?
4. what size are your tires ?
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I got the 5100 series for 0-3 in lift I believe and they feel great. My tire are 34 in and they’re set at 55 psi back and 45 psi front. I think I narrowed down the problem to the ball joints not being correctly torqued and in the right order causing binding in the Knucle so I guess I’ll tear her back down and retorque the correct way.
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