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**MikeD** · 10-26-2004, 03:24 PM

B_and_D,

I think that Ray's explanation is the right one. I just returned from a trip to Yosemite over Highway 120. I recall that the grades are all in the 6% to 7% range. I haul my 2720 with a Chevy Tahoe (5.3L, 3.83 axel, 4 wheel drive) - so the comparison is good with your Silverado. I used the Tow/Haul selector, but experience the same engine surge which climbing as you do - as the transmission hunts down to 2nd from 3rd and back to 3rd when I depress the throttle. I usually shift manually, leaving it in 3rd unless I slow too much, and then dropping down to 2nd. I find that I can do a much better job of gear selection than the tranny brain. For going downhill, I spent a lot of time in 2nd, to take advantge of the engine braking to keep my speed under control without using my brakes.

MikeD

10-26-2004, 03:24 PM	#5
MikeD Site Sponsor Join Date: Aug 2003 Posts: 92	Chevy Silverado 1500 Towing Question B_and_D, I think that Ray's explanation is the right one. I just returned from a trip to Yosemite over Highway 120. I recall that the grades are all in the 6% to 7% range. I haul my 2720 with a Chevy Tahoe (5.3L, 3.83 axel, 4 wheel drive) - so the comparison is good with your Silverado. I used the Tow/Haul selector, but experience the same engine surge which climbing as you do - as the transmission hunts down to 2nd from 3rd and back to 3rd when I depress the throttle. I usually shift manually, leaving it in 3rd unless I slow too much, and then dropping down to 2nd. I find that I can do a much better job of gear selection than the tranny brain. For going downhill, I spent a lot of time in 2nd, to take advantge of the engine braking to keep my speed under control without using my brakes. MikeD __________________