Jump to content

Transmission options

Chevyfan3

By Chevyfan3
in Troubleshooting & Recalls

 Share

Recommended Posts

Chevyfan3 Enthusiast

Chevyfan3

Posted
Posted

What's everyone doing to resolve transmission issues with there 6l90e? I have lost 5-6 gear with a po741 recently with 49k miles. Fluid looks great and no burnt smell from what I see on the dipstick. I haul a 7500lb travel trailer so maybe I'm overloading this rig. I had a 17' tundra 5.7 before this truck that I went 60k with and no issues. Thought upgrading to an HD was the smart move for long term hauling reliability. So my options seem to be dump the truck and go back to Toyota, get a GM reman $5500 and have the 3yr nationwide warranty but they won't let me install a better converter with that (so I'll just be getting the same crap and waiting for it to fail again)  or try to find a local trans shop in my area and hope for the best. Crushing blow and support disappointed in this, fluid has been changed every 10k after camping season and I'm still left with a failure. I travel far with this truck 1200-1400 miles so I need it to be reliable.

diyer2 Senior Enthusiast

diyer2

Posted
Posted

I feel your pain.

Roll the dice with a custom built trans towing 7500 lbs.

Chevyfan3 Enthusiast

Chevyfan3

Posted
  • Author
Posted
Just now, diyer2 said:

I feel your pain.

Roll the dice with a custom built trans towing 7500 lbs.

You think I'm pulling to much for the 6l90 and 6.0? Should I just go ahead and upgrade to a dmax? I'm afraid I'm gonna spend this money just to have it fail again.

diyer2 Senior Enthusiast

diyer2

Posted
Posted

Daily driver?

7500 lb travel trailer is occasional use right.

Not worth the up front cost and maintenance of a diesel to me.

But if you want longevity diesel with Allison trans.

 

KARNUT Senior Enthusiast

KARNUT

Posted
Posted

In the good old days you could daily drive a diesel. My 83 year old mother has been driving a 2000 Ford 1 ton 7.3. It just passed 200K miles with very little maintenance. She drives secondary roads barely hitting 60. It’s an amazing vehicle. Her other diesel is a 98 Ram 3/4 ton diesel. It was my father’s last work truck retiring in 2000. It has about the same mileage. 

newdude Senior Enthusiast

newdude

Posted
Posted (edited)
4 hours ago, Chevyfan3 said:

What's everyone doing to resolve transmission issues with there 6l90e? I have lost 5-6 gear with a po741 recently with 49k miles. Fluid looks great and no burnt smell from what I see on the dipstick. I haul a 7500lb travel trailer so maybe I'm overloading this rig. I had a 17' tundra 5.7 before this truck that I went 60k with and no issues. Thought upgrading to an HD was the smart move for long term hauling reliability. So my options seem to be dump the truck and go back to Toyota, get a GM reman $5500 and have the 3yr nationwide warranty but they won't let me install a better converter with that (so I'll just be getting the same crap and waiting for it to fail again)  or try to find a local trans shop in my area and hope for the best. Crushing blow and support disappointed in this, fluid has been changed every 10k after camping season and I'm still left with a failure. I travel far with this truck 1200-1400 miles so I need it to be reliable.

 

 

Have a shop do it.  You can upgrade the converter and the 4-5-6 clutches during the build as many transmission companies have upgrades for those both.  A Gm reman will be all new and have that nice warranty but they don't use a revised/billet converter nor do they add upgraded 4-5-6 clutches.  

 

No, 7500lbs is not excessive for a 2500hd, and definitely not excessive for a rebuilt and upgraded 6L90.  You aren't overloaded at 7500lbs for a truck that's rated for over 13,000lbs.  

 

Unfortunately there is just some sort of issue in the design or manufacturing chain GM ran into on these 6L80 and 6L90 transmissions some time after they started the 2015 generation launch on HD and 2014 on 1/2 tons.  Prior to this, there was a much lower failure rate.  07-13 trucks we almost never pulled out a 6L80 or 6L90 for issues. 

Edited by newdude
  • Like 1
  • Thanks 1
Chevyfan3 Enthusiast

Chevyfan3

Posted
  • Author
Posted
1 hour ago, diyer2 said:

Daily driver?

7500 lb travel trailer is occasional use right.

Not worth the up front cost and maintenance of a diesel to me.

But if you want longevity diesel with Allison trans.

 

No not a daily I use this for camping trips with the family 1-2 times a month with an average trip of 1200 miles. That's why my milage is so low. It's a personal truck, not beat on at all.

 

I hear ya, I looked at diesels and it's a 10k up charge , whew.

Chevyfan3 Enthusiast

Chevyfan3

Posted
  • Author
Posted
37 minutes ago, newdude said:

 

 

Have a shop do it.  You can upgrade the converter and the 4-5-6 clutches during the build as many transmission companies have upgrades for those both.  A Gm reman will be all new and have that nice warranty but they don't use a revised/billet converter nor do they add upgraded 4-5-6 clutches.  

 

No, 7500lbs is not excessive for a 2500hd, and definitely not excessive for a rebuilt and upgraded 6L90.  You aren't overloaded at 7500lbs for a truck that's rated for over 13,000lbs.  

 

Unfortunately there is just some sort of issue in the design or manufacturing chain GM ran into on these 6L80 and 6L90 transmissions some time after they started the 2015 generation launch on HD and 2014 on 1/2 tons.  Prior to this, there was a much lower failure rate.  07-13 trucks we almost never pulled out a 6L80 or 6L90 for issues. 

Yeah a local shop quoted me 4500-7500 said it just depends how bad it is once it's apart. I figured I wasn't pushing this truck to bad, it's been great until this major failure. I just need it to be reliable so I don't get stuck traveling somewhere with my family and camper. 

 

I thought the 6l90 was pretty bulletproof, so it's the earlier years. You would think gm would offer some kind of fix for this for customers. My dad had a 10 year old Saturn Vue that they 100% covered for to a special campaign of the wave plate I think. Such low mileage trucks going out can't be a good look for GM. 

Chevyfan3 Enthusiast

Chevyfan3

Posted
  • Author
Posted

Well called a bunch of the higher rated transmission shops in my area and no one builds 6l90's they all told me they just get gm remans and slap them in there. Said the cost to build one puts you over the reman cost so it doesn't make sense for them. If I add a better convertor to the GM reman no warranty. So I'm going to put $5500 into it and end up with the same ole garbage, nice. I had a feeling I would run into that, my area sucks for machine shops, custom vehicle shops.

diyer2 Senior Enthusiast

diyer2

Posted
Posted

A suggestion, switch the new trans to Amsoil fluid. 

  • Haha 1
  • Sad 1
64BAwagon Senior Enthusiast

64BAwagon

Posted
Posted

The converters are the main weak link on these transmissions. Unless you could upgrade to a billet torque converter on the new one I think youre just throwing good money after bad. 

Without a tear down on the old one theres really no way to know for sure what failed. 

That setup should have easily handled 7500lb

Chevyfan3 Enthusiast

Chevyfan3

Posted
  • Author
Posted
22 hours ago, 64BAwagon said:

The converters are the main weak link on these transmissions. Unless you could upgrade to a billet torque converter on the new one I think youre just throwing good money after bad. 

Without a tear down on the old one theres really no way to know for sure what failed. 

That setup should have easily handled 7500lb

I agree totally, it at the very least needs a bullet convertor. Issue is the shops around me won't rebuild these units and just install gm remans which won't allow me to upgrade it and keep the warranty. So I'm stuck.

 

 

Fluidwise it was always changed everyear after camping season, used the Delco fluid and it always looked great. I doubt going to another fluid would of changed my outcome. 

 

I think I'm just going to trade the truck off, been a long time Chevy truck owner but maybe it's time to try something else. If I get a newer hd they still have the 6l90e and if I wait for a 2024 I'm going to miss a good chunk of my camping season. 

64BAwagon Senior Enthusiast

64BAwagon

Posted
Posted
33 minutes ago, Chevyfan3 said:

I agree totally, it at the very least needs a bullet convertor. Issue is the shops around me won't rebuild these units and just install gm remans which won't allow me to upgrade it and keep the warranty. So I'm stuck.

 

 

Fluidwise it was always changed everyear after camping season, used the Delco fluid and it always looked great. I doubt going to another fluid would of changed my outcome. 

 

I think I'm just going to trade the truck off, been a long time Chevy truck owner but maybe it's time to try something else. If I get a newer hd they still have the 6l90e and if I wait for a 2024 I'm going to miss a good chunk of my camping season. 

The trucks with the 6.6 gas have a different 6L90 than previous trucks with the 6.0 had. They made some improvements to them including an extra clutch. 

Create an account or sign in to comment

You need to be a member in order to leave a comment

Create an account

Sign up for a new account in our community. It's easy!

Register a new account

Sign in

Already have an account? Sign in here.

Sign In Now
 Share
Go to topic listing

  • Latest Articles

  • Posts

    • Chuck FB
      Tire psi

      By Chuck FB · Posted

      I will admit I haven't experimented much with pressure drops beyond the numbers I put in and part of that is that the numbers I used are fairly low and then found out it would trigger regardless at that 35 psi. Having said that I had tried before had changed the placard pressures and being that I have a 1 ton set to 80 on the placard for the rear I believe it triggered close to 60, the front I don't recall now for sure but thought maybe it could get close to 45 from that factory 60 placard pressure. So I never did figure out if it was a number of psi from placard pressure to the alarm or a percentage of the total placard number as some figured it was like a 25% drop from placard pressure would trigger it. So as to try and answer your question, I believe I set the placard pressure on the front to 47 or so and while I run the front tires at 40, they have dipped below that some if its colder and I haven't put "winter air" in yet and never once have had the front alarm go off. I would say that the answer your looking for is no, that if you set your placard pressure to 45, you have a certain amount of room to drop below that pressure before the alarm will go off.    The pressures you decide to run in your truck, that ends up being what makes sense to you based on what your carrying in your truck or if towing, then have to bump them back up to something that will carry the load in the rear and the fronts typically left at the same pressure. It all comes down to that chart I put the link to and using an accurate roadside scale to be your guide, both unloaded and then loaded to know your minimum safe pressures.    I just wish GM would allow a person to change the readings for the tire pressures to the English system of pounds as I have to look at that goofy metric reading that will never ever jive in my head and will go over and change it just to figure out what they are if need be and then change it back. 
    • TrueBlue
      No Software Updates - Old Build

      By TrueBlue · Posted

      That part I understand, that the dealer can do it. But I'm not understanding why updates that were available to the truck since it left the factory, or the dealership originally, would not still be available to it without dealer intervention.   I'm thinking along the lines of recalls. They stay available until they are completed. Why not updates as well, especially since some of those can be safety related also?
    • jgaudet99
      Tire psi

      By jgaudet99 · Posted

      That's good to know, but I don't think I'll even be running them under 45 in the rear  unless it's on the sand or something but will only be for a short distance anyways!    I didn't read all the instructions in the booklet yet, but do you know let's say I set the rear psi on the placard to 45, will the warning light come on soon as it drops under 45 or is there a percentage it has to drop from the set value before the warning light is triggered?
    • newdude
      Would this CV Shaft be bad?

      By newdude · Posted

      That's bad.  Like, its probably destroying the stub axle the CV slides into.   Do you have a proper lift installed with differential lowering brackets?  Did you install AT4/Trail Boss factory CV axles?  
    • PunchT37
      Would this CV Shaft be bad?

      By PunchT37 · Posted

      Hot? New Jersey? Today? I was working on my old 2000 Silverado 1500 today. Believe me, it was boiling hot today. As it has been.

  • GM-Trucks.com Clubs

  • Popular Contributors

×
×
  • Create New...