Thud when shifting out of overdrive

blackbeautyhemi · Feb 8, 2017

Alright looking to see if anyone has experienced this or know why mine is doing this, but when I ease into the throttle or go up a grade when my truck is in overdrive and it goes to kick down a gear it shifts and then there's a thud that jolts the whole truck. It shifts up through all the gears smoothly and when you apply full throttle it kicks down smooth and shifts fine. This only occurs on a normal downshift out of overdrive. Today I got a code, P0734 - 4th gear incorrect ratio, my 4th gear still works and when I'm in tow/haul or od off mode it doesn't do it at all. Transmission fluid and level is fine, does it still when my tune is set back to stock, no broken tranny mounts, u joints seem fine. Any ideas?

blackbeautyhemi · Feb 9, 2017

jljbtm · Feb 11, 2017

If the driveshaft has a slip joint make sure its not dry.

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blackbeautyhemi · Feb 11, 2017

Thanks I'll look into that.

blackbeautyhemi · Feb 13, 2017

It almost seems like a sensor that's hesitating coming out of overdrive. It's smooth on every other shift, up or down, just not when it's coming out of overdrive.

blackbeautyhemi · Feb 14, 2017

Anybody?

NOcasio7 · Feb 14, 2017

I feel like I have the same issue and just havent been able to explain it. I would love to know what is going on. I have a 2015.

NOcasio7 · Feb 14, 2017

*Subscribed

kewpie79 · Feb 14, 2017

u joint, I'd check that

blackbeautyhemi · Feb 14, 2017

kewpie79 said:
u joint, I'd check that

They seem fine. No squeak or play.

chefred112 · Feb 15, 2017

its a tranny issue...does the fluid smell burnt at all...when I got this code i use to reset til ultimately my tranny failed and needed rebuilding/replaced (4th gear clutches/steels)

blackbeautyhemi · Feb 15, 2017

Nope not burnt smelling and and not discolored at all. When it's in overdrive and I hit the tow/haul button it shifts perfect out of overdrive. No thud like when you're just driving normal and it downshifts out of o/d. Why would the tow/haul trick it?

Marciel · Feb 17, 2017

It may be some electronic issue in the tranny lime a solenoid or something, usually a much cheaper fix. My tranny does weird things now and again but keeps going. I actually wouldn't mind it going out so I can buy a shift kit and good internals.

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blackbeautyhemi · Feb 17, 2017

Yea I already had the solenoid pack issue a lil over a year ago and it just went into limp mode and never came out. Didn't act like this. Found a post on the Z forum where a guy had the same symptoms as me and took it to the dealer to have the tranny flashed for a "quick learn" and it took care of it. So I'm gonna try that next and see what happens. Trying the cheap and easy alternatives first lol.

Thud when shifting out of overdrive

blackbeautyhemi

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