1989 gmc sierra rebuilt trans new motor when its under a load pulling something going up hill motor will redline and will hardly go up hill if i am lucky

Asked by Anthony Oct 24, 2018 at 08:25 PM about the 1989 GMC Sierra 1500 C1500 Standard Cab SB

Question type: Maintenance & Repair

truck has the 350 auto had trans rebuilt new motor.long has truck isnt pulling
anything its fine but soon as it pulls something under a load going up hill truck
will red line.starts to slow down.

1 Answer

25

How heavy is the load,what is your vehicle rated for,did the put a heavy duty trans cooler,if i were just guessing on information provided. Sounds like the truck is not made for what it towing ,its having to downshft to maintain any speed at all ,too much of that and transmission is going to over heat wont last long

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