Hello There, All - This is my first posting to DD's...I have been reading alot of interesting stuff on this site and am excited to be a part of it.
I have a 2006 GMC 2500HD LBZ Duramax.. 37" BFG AT KO / 6" Lift - Air bags - K&N / RBP 5" Cat back and running stock 3.73 gears. It turns about 1700 @ 70 mph. I currently pull a boat at loaded weight of 7500lbs with no issue at all and typically on flat roads. The Although the diesel pulls super strong and shifting is smooth, it feels like it is not in its proper power band - kinda like the engine is laboring. I am looking into a 39 foot 5th wheel toy hauler with a dry weight of 12400 lbs (max 16000 lbs). I am thinking that the gearing will be on the high side. Is 4:56 the answer for the weight and power band ? If so, what will it do to highway mileage when not towing ? Can anyone share with their RPM is at 65 or 70 mph with 37's and 4:56 gears ? Typically, I am getting about 14 to 16 MPH on the hwy @ 70 mph. Thanks...
I have a 2006 GMC 2500HD LBZ Duramax.. 37" BFG AT KO / 6" Lift - Air bags - K&N / RBP 5" Cat back and running stock 3.73 gears. It turns about 1700 @ 70 mph. I currently pull a boat at loaded weight of 7500lbs with no issue at all and typically on flat roads. The Although the diesel pulls super strong and shifting is smooth, it feels like it is not in its proper power band - kinda like the engine is laboring. I am looking into a 39 foot 5th wheel toy hauler with a dry weight of 12400 lbs (max 16000 lbs). I am thinking that the gearing will be on the high side. Is 4:56 the answer for the weight and power band ? If so, what will it do to highway mileage when not towing ? Can anyone share with their RPM is at 65 or 70 mph with 37's and 4:56 gears ? Typically, I am getting about 14 to 16 MPH on the hwy @ 70 mph. Thanks...
