4:10 or 3:73 ?

Me Again wrote:

jaycocamprs wrote:
The DW and I have begun talking about replacing the current 05 Duramax with a new truck. Question is another GM or the Ram, it won’t be a Ford. I get what yall are saying, at the 12k scaled weight that we are running I could get by with a SRW 6.4 Hemi. But we have a DRW diesel truck, and we don’t want less than we now have. I know that the Cummins with a 3:42 will pull this or even a larger trailer just fine. I also don’t need a DRW truck that cruises 80 MPH empty. I just don’t drive that fast. In this part of the country that will get you face time with a LEO, and that is something I try to avoid. Fact is I want a TV pull my trailer up to 65 MPH in comfort on cruise control. I rarely drive my current truck long distance or on the interstate not towing. I have other vehicles for that. So a truck that won’t shift into top gear below that speed towing does not make sense to me. So if a Ram with a Cummins and 4:10 gear tows it like it’s not there, it’s ok. I won’t come back and complain about having too much truck. And if we ever buy a larger trailer, I won't have to worry if I have enough truck.

You are still not understanding the beauty of the 3:42's and Aisin tranny. You do not have to be in 6th to tow 65 RPM with the RAM set up that way. 5th will be about the same RPMs and 4:10's in 6th.

Unhook the trailer and you cruise at comfortable low RPMs in 6th at 60, 65, 70 etc. It will shift to 6th at lower RPMs when not in tow haul.

Chris

Never understood why we have to tow in 6th gear or the top gear.

That is the whole purpose of a transmission. I agree the 3.42 is the ideal rear gear for the Cummins with the Aisin.

Unloaded as said you can cruise at a comfortable and fuel saving rpm even at 80-90 mph which I often see out here in the west with speed limits at 80 mph.