towing rpm

john&bet wrote:

boogie_4wheel wrote:

john&bet wrote:

boogie_4wheel wrote:
If this is an early 04, try running with the T/H off. This will allow it to drop into 4th and would probably net you some fuel economy. Save T/H (OD lockout) for the hills.

The 04.5+ T/H allowed 4th gear operation, but 04 and older was an OD lockout feature. I don't know the specs on your FW but would at least try to pull it in OD.

With reguard to the t/h mode, if I push the button I run the ops' rpm. I put my '04.5 in D and go. I very seldom push the button. I generally run 1800 rpm on the interstate with very little down shifting and 55 mph on other roads.

Maybe I'm wrong... The T/H on the '04.5 is still only a lockout :? When you first enable T/H while under way, the truck will downshift to 3rd, but after a few seconds it will upshift back to 4th. Try it from a stop empty with T/H enabled, truck should go into 4th at ~45mph with light throttle. If it doesn't then I was wrong and the T/H with 4th enabled is an '05+ thing (not an '04.5+ thing).

For the OP, I would still try running without T/H enabled and pulling in 4th.

I don't notice mine shifting back to 4th under load. I will try what you suggested after bit when I have to go to town just to see.

I tried it yesterday afternoon and it does not shift into 4th. The torque convertor locks up and it stays in 3erd. If I hit the button at speed it shift down to 3erd and torque convertor unlocks, then a few seconds later the torque convertor locks up again. Just how mine works. Others may be different. I have a Jan.'04 build date, with 325hp,600tq.