No they are great much better then rubber. Rubber is nfg in a year or so. Have one on my old 2 piece. Can maybe get a photo Tuesday or Wednesday
CK5
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Again !!! My trans just went
- Thread starter 73K5BlazerSS
- Start date
Center Support Bearings - Inland Empire Driveline - Inland Empire Driveline Service
Our custom center support bearings were designed for high performance and heavy towing. Inland Empire Driveline Service
Not even 20k miles and 10 months old and it's doing it again. The trans is shuttering, it feels like the torque converter again. Maybe I'll get lucky and it will be the center support bearing.
Anyone have much luck with their Jasper warranty? My old man has had lots of problems with jasper engines, transmissions, and their warranties. He had to fight with them every time to get a replacement. I'm guessing it's no different than health insurance. They start off denying everything to see if you'll pay out of pocket.
Anyone have much luck with their Jasper warranty? My old man has had lots of problems with jasper engines, transmissions, and their warranties. He had to fight with them every time to get a replacement. I'm guessing it's no different than health insurance. They start off denying everything to see if you'll pay out of pocket.
Maybe jasper is having a shareholders meeting near by
To soon?
Yes, too soon 
I don't want to buy another new truck, but I'm thinking the 6L90 is never gonna last in my truck. This one is number 5.
I don't want to buy another new truck, but I'm thinking the 6L90 is never gonna last in my truck. This one is number 5.
I just saw this thread. Reading all of it is really surprising to me.Yes, too soon
I don't want to buy another new truck, but I'm thinking the 6L90 is never gonna last in my truck. This one is number 5.
Just last week I talked to the guys at the local New Bern Transport shop, (Pepsi) and they told.me of their service truck just getting a transmission in it last fall. Theirs has an 11' service body with a welder and torches riding in the center. They know that it's overloaded for a 3500.
The truck was at 498K that day. They claim original engine and just got a transmission last fall. 6L90 in it, i am unsure of the year, later '07 to '11, is my guess.
My shop truck is a late '07 and has the original transmission and convertor. Only a little 2500, but I just hit 170K on it.
I did pull a 33,000 mixer truck across town with, twice. Otherwise is basically a daily driver small toolbox.
So I am amazed that you have so many problems with your transmission.
I have heard of a billet construction convertor that some praise for these, but I have no real proof or experience myself.
I hear similar things from others about the 6L90 being a solid trans. Mine is in a 2011 DRW Enclosed Service body. It usually weighs around 10k lbs. The GVWR is 13300 lbs, so in my mind I'm good. The brakes last a long time and the suspension is just touching the overload springs. The truck handles the weight fine.
I think one of the problems is whoever rebuilt them. The 1st rebuild was a joke, maybe 6k miles. Same for the 2nd and 3rd. It's gotta be more than bad luck at this point. I just wish there were competent builders near me. Around here I can take it to the dealer or get a Jasper from a shop. Maybe at 13 years old I should get ready to move on to a new truck. I won't get another 6L90, so I'd have to go 2024 or newer to get the 10L1000 in a gas engine. I hate more payments.
Two things to always do on a 6L series trans, replace the converter with a billet cover style with improved clutch design, second install a thermostatic bypass valve to keep trans temps down. Extra points for valve body modification to replace worn components , Sonnax/ Transgo etc. Nothing goes out of this shop without all of these and more, and they stay out.
Temperature is what’s killing them if you haven’t done the bypass….6L90s run way too hot in factory form
The 6l80's in cars, have temp problems as well?
Never liked the one in my G8 - as it never came with a dip stick. Cant check the fluid on it...
Never liked the one in my G8 - as it never came with a dip stick. Cant check the fluid on it...
It must be a year thing, correct?
I have never seen this '07 one get past 195*. And I was towing the mixer across town on a 95* day when I saw that. But I didn't go faster than 45 mph.
I think the thermostatic valve might only be a 1500 truck/suv thing on '14 and up trucks. GMT900s definitely did not have it while the K2 ones do.
The torque converter thing, 6L80s have 3 bolts to the flex plate while the 6L90s have 6. I think those extra bolts add some rigidity to the stamped steel housing on the torque converter so it doesn't flex or warp quite as much which is why 6L90s seems to have a lower percentage of converter issues in general than the 6L80s. Some people use the 6L90 converters on their 6L80s because they're a slight improvement and are cheaper than billet converters.
The shift pattern and lock up also isn't quite so aggressive on the 6L90s as most 2500+ trucks are exempt from gas mileage rating. So the tuning is slightly better than the 1500s that try to be in 6th converter locked at 35mph. Also axle gearing is better on the HD trucks which helps reduce load. It all plays in together.
The torque converter thing, 6L80s have 3 bolts to the flex plate while the 6L90s have 6. I think those extra bolts add some rigidity to the stamped steel housing on the torque converter so it doesn't flex or warp quite as much which is why 6L90s seems to have a lower percentage of converter issues in general than the 6L80s. Some people use the 6L90 converters on their 6L80s because they're a slight improvement and are cheaper than billet converters.
The shift pattern and lock up also isn't quite so aggressive on the 6L90s as most 2500+ trucks are exempt from gas mileage rating. So the tuning is slightly better than the 1500s that try to be in 6th converter locked at 35mph. Also axle gearing is better on the HD trucks which helps reduce load. It all plays in together.
I will say otherwise about the shift patterns. My work truck will go to 6th by 45 mph if left to its program.
I spend a fair amount of time dropping it back down to 5th. The truck has 4:10s in it.
I spend a fair amount of time dropping it back down to 5th. The truck has 4:10s in it.
This is what I need !! I wish I was in Texas. I've asked the last few shops to make upgrades and they looked at me like I was bat shit crazy.
Whats your opinion on the new 10L1000 in the HD trucks?
just happened on this thread- sorry to hear about all the premature failures. what a headache! i completely avoid all 700r and 4l60 vehicles after seeing some of my friends do this dance...
I had a 2014 extended wheelbase Savana with a 6 speed for 4-5 years as my work vehicle. actually, I really liked the way it felt and performed. thought the "manual shift" option actually seemed to work well and may have been fun in a 4x4 toy? put 170,000 miles on that van fully loaded with tools, machinery, and debris -never did anything other than oil and tires on that van.
wish i had something helpful to contribute! the poly bushing for the driveshaft is long overdue - hope there is one out there for my 2004 tundra!
I had a 2014 extended wheelbase Savana with a 6 speed for 4-5 years as my work vehicle. actually, I really liked the way it felt and performed. thought the "manual shift" option actually seemed to work well and may have been fun in a 4x4 toy? put 170,000 miles on that van fully loaded with tools, machinery, and debris -never did anything other than oil and tires on that van.
wish i had something helpful to contribute! the poly bushing for the driveshaft is long overdue - hope there is one out there for my 2004 tundra!
I tried this on the way home.
Yeah mine was in 6th /lock-up at 45mph.
But in lockup it shouldn't be making heat at least.
