I have a 2007 (new body) 1500 2WD with the crew cab and 3:23 rear gear with trailer towing. It is rated at 4,600 max trailer towing capacity. We recently bought a 4,800 lb travel trailer. Short trips are not big deal. Longer trips are not working at all (for obvious reasons). To maintain 60 it will frequently run to 2nd gear at 3,700 or so RPM.

The issue is more the parachute affect of the trailer in the wind.

This same truck with a 3:73 gear is rated at 6,600 per the owner's manual. I can for about $700 have the local trans shop rebuild the rear carrier with those gears and I have a programmer to set the new ratio.

The problem is, I still don't think the little 4.8 will do it. I found some 6.0 swaps in the salvage yards out of 2500 and 2500 VANS fairly reasonable in price.

I'm thinking the gear and the engine and tuning will be way less than replacing the truck. We bought it new and have 63,000 miles.

But...I'm running into confusion on the 6.0 as my engine is NOT a 4/6/8 displacement on demand...and I don't have the wire harness for it. I would like to swap the bigger mill (stock) and program to the 6.0 specs and 3:73 gears.

In all the swap charts and inter change info...I'm still confused for this swap.

The my2007 was a change over year and the swap info is sketchy...as it is more like a 2008 than a 06 - but shares little if anything with a 2007 Classic.

So, anybody know the range of models I can get a 6.0 from to do plug-n-play other than the tuning?????