Chevrolet trucks coasting

#1
[Bob] Having a problem while towing on a downhill grade. Truck while in drive seems to free wheel, not having any engine hold back effect, and I need a lot of brake, even down shifting does not seem to help. Not getting much help from dealers as to what is wrong. Any help would be greatly appreciated. Thank you.
 
#2
Chevrolet trucks coasting

[John] It would probably be best to note what kind of truck, engine, and transmission types in order to better identify a possible solution to your problem.
 
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