My Crew used to fly down hills so bad that I had to keep tapping the brakes to keep it under 70mph. Now it continually slows down going down hills and I actually have to accelerate!

I used to let off the gas when coming to a light or stop sign and coast up to it; now if I let off the gas, its almost like I get a slight jerk like the brakes are being applied and I can't make it to the light, etc. I have to stay on the gas and then apply brakes. This is not the way I'm used to driving and my gas mileage on a trip to CA using the cruise control was only 15mpg.

Truck has no squeaks, thunks, noises, etc. and only 37,000 miles on it. Rear end and tranny oil have been changed.

Does it sound more like brakes or tranny or ? and what could I check on it at home?

TIA

 

I don't know for sure, but I'd have the brakes checked to see if they are "dragging". I'm pretty sure you would notice that, though. If they drag that bad, you would probably smell them. I'm sure someone will be able to give you some pointers, though. Good luck.

 

See if it is transmission or brakes.
Shift to neutral and coast. If it still does it it would be brake related.
If not, then I would be thinking OD lockup is not disengaging.
What is not generaly known is the lockup is also controlled by letting up on the throttle as well as the speed senor inputs to the PCM that in tern contol the lockup.
This little 'ditty' is one reason besides the higher weight that makes the brake wear higher than the old trucks of years ago. There is less engine braking than there use to be with the old AOD transmissions.

 

What year of tranny? There were alot of 4r100's with coast clutch failures I believe it was only 2000 and 2001's
Alan

 

i noticed the same problem with my 2002 screw this weekend. but it only happened at speeds above 70mph.