Transmission problems

[mwooten84]

Have a 2017 sierra 4wd. Pulled the tarns pan to change fluid and filter because I had a shudder. Pan was full of metal. So I took the pan to a shop and they are saying I need a new torque converter and to rebuild the trans because it most likely ate up the pump. Does this sound right or is it just a shop trying to get over on me ?

[rav3]

How many miles? 6 speed?

Sounds correct. The torque converter is the weak point on these 6 speeds. I would recommend going to the 6L90 torque converter. Here's  a good info link 

https://nextgendiesel.com/blogs/transmissions-101/general-motors-6l80-e-6l90-e-transmission-problems-solutions

Edited January 2, 2023 by rav3

[mwooten84]

94,000 miles and yes 6l80. He says there are upgrades he will do while rebuilding it. Like billet torque converter and doing away with the thermal bypass 

[rav3]

Yes, take their advice about the thermal bypass. Make this transmission run cooler like the old 4 speed autos did. That was the first thing I did when I bought my '17 & well as the Range AFM delete.

Your miles sound about right from what I see & read on the internet. I'm curious on what their cost is for this. 

[mwooten84]

$3800 with a 2 year unlimited miles warranty 

[rav3]

 

[Gofas]

For sure prepare for a new transmission install.

these transmissions are Pos

 

Get the new GM with warranty and upgraded parts that don’t break. 

I paid 5300 total

i was luckily I got 120k miles from my original. 
New transmission mucho better.

just suffering from almost 2 mpg less than old.hope this changes. My average used to be 16.5 now it’s 15 ish 

good luck

 

my mods :))

ac system

starter

radiator

transmission 

Seat switches 

axle joints 

soon new booster brake pump

 

 

 

 

 

[mwooten84]

I got it rebuilt with everything changed that’s known to be a problem. I was getting 16.2 right after I got it back. It’s back up around 18.3 now. I just replaced the vacuum pump