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Hard Downshifts - Is This Normal?

jerkyboy

By jerkyboy
in Engines & Drivetrain

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jerkyboy Enthusiast

jerkyboy

Posted
Posted

Have an '18 Silverado 1500, 5.3L, 6spd auto. It's got about 17k on it and I've only had it for a month or so. I've always noticed that it downshifts pretty hard, so hard it almost clunks and you can always feel it.. I'm not 100 percent certain what gear but I think it's second. Is this normal? My old truck was a duramax with an allison tranny and I never experienced the hard downshifts.

bigskyindy Enthusiast

bigskyindy

Posted
Posted

Might be your torque converter, they changed fluids in mine because gm has changed the fluid that is supposed to be used in it like 3 times and it fixed my hard shifting.

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1SLOW1500 Senior Enthusiast

1SLOW1500

Posted
Posted

I would try manual shift with the button and see if it does it. But sounds like you need to at least reset your trans adaptive tables.
I know you are in warranty and all that good stuff but I would drop pan clean and check fuild replace and reset. Then see after that if still issues talk to gm.

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1SLOW1500 Senior Enthusiast

1SLOW1500

Posted
Posted
It’s normal
Really? I have not had this but I have 11k and built trans so maybe not a good example. I know of many issues with converters,fluid, even driveshaft.and axles.

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CamGTP Senior Enthusiast

CamGTP

Posted
Posted

Depending on what gear the transmission is currently in and what gear it downshifts to, it will do what you can call a pass through neutral. It will be a direct change from gear to gear without it going through another gear to reach it.

 

I think 5-3 downshifts and for sure 6-2 downshifts are this way. The computer in stock form will yank timing all the way back to -20 degrees to help smooth this out but you're still going to feel that gear change.

1SLOW1500 Senior Enthusiast

1SLOW1500

Posted
Posted

Thought maybe the fuel deactivation does this as I have read people complain about it. I don't know I disabled all that. But makes sense.

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