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3rd Gear Slipping Issue?

jdewolfe

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jdewolfe Enthusiast

jdewolfe

Posted
Posted

Hey guys,

 

For quite a while now, probably over a year, I've noticed that when downshifting from overdrive into 3rd the rpm's will jump a little and then go back to normal almost like the tranmission is slipping or something. Just the other day this started happening when shifting from 2nd into 3rd. Just wondering if anyone has any thoughts on what might be happening. I have the battery unplugged right now just to see if anything weird is going on there, but I'm doubting that will help. Only thing that has changed is my local GM dealer put new transmission cooler lines in and that was a few months ago already. The downshifting "slip" was present before they did that. One other question, I bought this truck certified used quite a few years ago, like 4 or 5 I think. Does this have any sort of drivetrain warranty left that could help if something is wrong?

 

Thanks in advance!

Jeff

gmtech4 Senior Enthusiast

gmtech4

Posted
Posted

Hey guys,

 

For quite a while now, probably over a year, I've noticed that when downshifting from overdrive into 3rd the rpm's will jump a little and then go back to normal almost like the tranmission is slipping or something. Just the other day this started happening when shifting from 2nd into 3rd. Just wondering if anyone has any thoughts on what might be happening. I have the battery unplugged right now just to see if anything weird is going on there, but I'm doubting that will help. Only thing that has changed is my local GM dealer put new transmission cooler lines in and that was a few months ago already. The downshifting "slip" was present before they did that. One other question, I bought this truck certified used quite a few years ago, like 4 or 5 I think. Does this have any sort of drivetrain warranty left that could help if something is wrong?

 

Thanks in advance!

Jeff

I'm afraid it'll get worse then no 3rd or 4th gear because of the infamous 3-4 clutch failure ,

 

You used to able to buy the 3-4 clutch pack separate but they have stopped selling them that way now ,

 

Rebuild or install a rebuilt unit when it finally shits the bed , ensure the cooler gets flushed , shift adapts reset with a scanner

jdewolfe Enthusiast

jdewolfe

Posted
  • Author
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Thanks for the reply even though it wasn't what I wanted to hear. Sucks because it is my daily driver. I think I have pulled a trailer with it twice ever and it only had a dirt bike and quad on it. I guess I'll take it in and see what they give me for a diagnosis. Will respond back here once I know more just in case it helps anyone else going forward. By the way, unhooking the battery and plugging back in overnight did nothing to help it. So definitely not something weird with the computer.

 

Thanks again.

gmtech4 Senior Enthusiast

gmtech4

Posted
Posted

Thanks for the reply even though it wasn't what I wanted to hear. Sucks because it is my daily driver. I think I have pulled a trailer with it twice ever and it only had a dirt bike and quad on it. I guess I'll take it in and see what they give me for a diagnosis. Will respond back here once I know more just in case it helps anyone else going forward. By the way, unhooking the battery and plugging back in overnight did nothing to help it. So definitely not something weird with the computer.

 

Thanks again.

They are gonna want to sell a rebuild , it only comes with a 1 yr warranty , a GM rebuilt tranny has a 3 yr warranty ,

 

The dealer will reset the shift adapts and flush the cooler with a fancy machine , it's a good deal , consider that , turn around time is half of a rebuild ,

 

I used to rebuild a tranny in 9 hrs out the door , replacing is 4 or so hrs , ( that doesn't mean you pay that , you pay the flat rate) which is higher , tech is always faster than the flat rate with experience like a tranny guy would have ,

jdewolfe Enthusiast

jdewolfe

Posted
  • Author
Posted

I'm looking into the certified used details now. I'm wondering if any of this might be covered under the powertrain warranty...need to find when I bought it. I've only got just under 82,000 miles on it.

jdewolfe Enthusiast

jdewolfe

Posted
  • Author
Posted

Has anyone used the Certified Used powertrain warranty? I purchased the truck 4/24/2010 so it looks like I have until 4/24 of this year. Any idea if the transmission would be covered under that??

gmtech4 Senior Enthusiast

gmtech4

Posted
Posted

Has anyone used the Certified Used powertrain warranty? I purchased the truck 4/24/2010 so it looks like I have until 4/24 of this year. Any idea if the transmission would be covered under that??

Tranny is in the power train soooo I think yes , see your advisor , you'll get it rebuilt

jdewolfe Enthusiast

jdewolfe

Posted
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Rob, when they replace the transmission does the torque converter get changed? Reason I ask is I'm trying to figure out what it still feels like it is slipping even after a new/reman transmission. Thanks!

gmtech4 Senior Enthusiast

gmtech4

Posted
Posted

Rob, when they replace the transmission does the torque converter get changed? Reason I ask is I'm trying to figure out what it still feels like it is slipping even after a new/reman transmission. Thanks!

GM trannies come with a new TC , pretty sure aftermarket does as well ,

 

Slipping in one gear has nothing to do with TC

 

You have the same problem after a rebuilt tranny install ??

jdewolfe Enthusiast

jdewolfe

Posted
  • Author
Posted

Yeah, same problem. Just trying to think if what else it could be. I'll be calling the dealership on Monday to let them know.

Crash1 Enthusiast

Crash1

Posted
Posted

Hey Jeff, I had similar issues with my trans. I bought the 03 Sierra 5.3 Z71 new, it shifted poorly from day 1, sometimes it would slam into gear while upshifting, dealer " could not find customer complaint " each time it went in for service/warranty. Around 100,000 miles it wouldn't shift into OD, or even stay stuck in 3rd sometimes. Dealer said a new "3/2 shift solenoid", this didn't totally solve the issues so they installed a new ignition switch. WOW!! The trans worked like a dream, smooth positive shifts while towing or empty. This lasted for 80,000 miles then I noticed a slight "RPM flare"after it had engaged 3rd gear. R&R Racing Transmission in Hinsdale NY overhauled it, replacing or modifying a lot of parts including the 3/4 clutches/basket, new convertor, oil cooler etc. Works well now. 1200 bux all in. Don't know if this will help you, good luck.

FYI: This truck works hard, carrying a 2000 lb slide-in camper while towing a 5000 lb car/trailer combo

jdewolfe Enthusiast

jdewolfe

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Thanks for the reply. Mine has never slammed into gear other than the notorious harsh 1-2 shift that everyone has. We'll see what the dealership says tomorrow.

jdewolfe Enthusiast

jdewolfe

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Truck is going back to dealership on Wednesday. They still think that they diagnosed it properly. The truck is still doing it, though it is considerably less noticeable. They said they still have my old transmission there...do I ask them to swap it back in and see if it comes back? I'm not really sure what to do at this point.

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