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Search Auto Parts Search lack of power Sign up here!   Email This Post Auto Repair Home>> Truck Repair>> Truck Engine Repair jumper New User Feb 6, 2010, 12:07 PM Post #1 of 4 (2414 views) lack of power Sign In 2004 gmc sierra 1500 2wd 6cyl 4.3, on the hiway uphill cant get any more power at about 55 mph it happens . in town it is fine - any suggestions (This post was edited by jumper on Feb 6, 2010, 1:10 PM) Tom Greenleaf Ultimate Carjunky / Moderator Feb 7, 2010, 4:03 AM Post #2 of 4 (2405 views) Re: lack of power Sign In Is it downshifting? Does using plain "D" instead of the overdrive "D" selection make any difference? T jumper New User Feb 7, 2010, 8:10 AM Post #3 of 4 (2398 views) Re: lack of power Sign In It only has a single D no overdrive , it does down shift and goes smothly through all gears any other time - It does it on a modest grade not just uphill (This post was edited by jumper on Feb 7, 2010, 8:43 AM) Tom Greenleaf Ultimate Carjunky / Moderator Feb 7, 2010, 9:30 AM Post #4 of 4 (2389 views) Re: lack of power Sign In ?? Almost all automatics have a locking torque converter which feels like a fourth gear or overdrive. This probably just does it all automatically as it's rare not to lock up at certain reduced loads in high gear. If this has full power from a stop as you expect from it but not at highway speeds it may not get the signal to downshift or unlock for more leverage (lower gear ratio) for the increased load. I can only guess so would need to know if it won't downshift at 55mph which I think it should. At over 70 most would not go to true second gear anymore as RPMs would be too high. General loss of power would be another approach to fix, T   Email This Post   Automotive Repair     Auto Body Repair and Refinishing     Heating or AC Issues     Electrical and Wiring     Brake Systems     Car Stereo Repair Advice     General Discussions     Car Making Funny Noises     Engine Fault Codes     Engine Troubles     Exhaust Systems     Steering and Suspension     Transmission Troubles     Tricks of the Trade Automotive World     General Discussions     Antique Car Talk     Car Shows and Events     The Bargin Bin     Motor Vehicle Inspection     Car Care Tips     Traffic Tickets     Gasoline, Motor Oils, Concept Cars and Engines     Auto Insurance, Financing, Leases, Warranties Truck Repair     General Discussions     Truck Engine Repair     Truck Suspension Repair Motorcycle Repair     General Discussions     Motorcycle Engine Repair CarJunky     Open Posting     Board FAQ's     New Board Suggestions

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