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6.0 With 6spd Engine Braking Questions

rayjc33

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rayjc33 Enthusiast

rayjc33

Posted
Posted

This truck is new to me, and when in tow mode it does the whole engine breaking , wich brings the RPMS up tp 5,000 sometimes. Is this normal, seems pretty extreme sometimes. Also is this hard on the truck. Thanks for any help with this

RyanbabZ71 Senior Enthusiast

RyanbabZ71

Posted
Posted

I posted the same thing on the light duty forum. My 6.2/6 speed recently did this and it freaked me out. It worked great just didnt expect it since my last 2 four-speeds with tow haul didnt do this. Mine hasnt shot up to 5K but has been to 4K.

 

its normal

jro909 Senior Enthusiast

jro909

Posted
Posted
huh, ok, just seems wierd.

 

 

think of it like, downshifting a stick shift to slow down...you drop into lower gears the engine will rev pretty high....

kdixer Enthusiast

kdixer

Posted
Posted

The trucks tuning does a pretty decent job of applying throttle at just the right time to smooth out the downshift (no sudden jerk). So I doubt it will have a negative impact on the drivetrain. But the tow haul grade braking is over aggressive in certain situations in my opinion. I often use manual shifting to provide engine braking on certain long steep hills. That way I have more control over rpms.

Rat4go Enthusiast

Rat4go

Posted
Posted

Keep in mind that T/H is supposed to be for when you're running more than 75% of your rated weight, so odds are GM set it up for folks running heavy and your comments are based on towing a lighter trailer. If you don't like it, you can get out of T/H mode, or if in T/H, just shift into M5 (instead of D or M6) and not get ANY grade braking if I remember what the GM trans engineers were talking about on this forum a while back.

alaska511 Senior Enthusiast

alaska511

Posted
Posted

Tow Haul is nice I guess, and as they have said, it is normal. I liked it better with my 8.1/Allison. With this truck I prefer running in manual shift mode when loaded. With the 4.10s and this 6 speed, holding in 4th or 5th is a dream while loaded

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