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Truck Downshifts Hard When Braking

tyhuck

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tyhuck Senior Enthusiast

tyhuck

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I just bought an 05 Z71 and I noticed that sometimes when I slow down and stop, I can feel the trnasmission downshifting. It feels like a someone is downshifting and letting the engine compression slow you down. The only thing is, Im not doing that. Its doing it on its own. My wife's Tahoe does it when in Tow/Haul, but she has the 6 speed. Ive got the 4 speed and Im not running Tow/Haul. Is that normal in the half tons. It doesnt really bother me, I just want to make sure nothing is wrong.

jro909 Senior Enthusiast

jro909

Posted
Posted

my 04 half ton does it also...its quite strange but its been doing it ever since i got the truck :)

tyhuck Senior Enthusiast

tyhuck

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It only does it when its cold. after it heats up I dont notice it so much. How long have you had your truck?

jro909 Senior Enthusiast

jro909

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Posted
It only does it when its cold. after it heats up I dont notice it so much. How long have you had your truck?

 

3 years...trans is serviced at the dealer also with no red flags

tyhuck Senior Enthusiast

tyhuck

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I started noticing that my wife's Tahoe also does it when not in tow/haul. Its just not as severe as when its in tow/haul. I guess it may be one of those things they did to aid in brakeing. Or maybe its one more thing to add to the list or wierd quirks that a GM vehicle has.

KMGZ400 Senior Enthusiast

KMGZ400

Posted
Posted

my 2001 does this too. it has always been there since i got it at 40k miles, but its now pretty rough at 85k.

 

i saw your other post about your rear end clunking, when shifitng to reverse and whatnot too, my truck also does this.

jro909 Senior Enthusiast

jro909

Posted
Posted

my trunk also clunks when going from drive to reverse or vice versa...has the 1st-2nd bump feeling when shifting..its always done it

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