As always, your insight and professionalism are greatly appreciated.I don't "trust" any AFM engine past 200,000 miles, The locking mechanism in the AFM Lifters wear causing them to stick in the collapsed position. This is the one failure mode that WILL happen eventually. Though I've had pretty good luck "Unlocking" collapsed lifters & disabling the AFM via tuning software.
Lifter Roller/Cam "Spalling" & Lifter Guide failures allowing the lifter/s to rotate can happen to any LSx engine. Though I'd say these failure modes are rare.
6L80E torque converter failures are less frequent in the GMT900 platform because the calibration differences between it & the K2XX platform.
The K2XX platform has serious issues with converter clutch failures after @ 100,000 miles. The Thermostat Bypass Mod is great & all.....But it WILL NOT prevent a converter failure, Like a bandaid on a GSW in my opinion.
Had a 76,000 mile 2017 K2XX Silverado in this past week with intermediate TCC Shudder. I first put a "No TCC Slip" custom calibration in the TCM along with disabling the AFM.
Completely cured the shudder sensation, However.....Quick throttle tip-in would cause spikes in TCC Slip. I maxed out TCC Pressure just to see what would happen, It didn't help.
Installed a twin disc Billet Front Converter along with a couple TransGo kits in the Valve Body, Fluid & Filter, & TransGo Thermostat Bypass kit.
Cleared the adaptives, Performed a quick learn, Then performed a couple thorough test drives.....It's like a totally different unit!
A lot of the clunkiness in K2XX 6L80E's is from the TCC being applied in lower gears for the sake of MPG. Calibrate it to apply only in 4th-5th-6th or 5th & 6th goes a long way!
Yes there are a few 11 and 12 Yukons in my area with the 6.2. Kind of where I was looking,, price-wiseBuy a 07 or 08 Yukon Denali w/6.2L. They didn't have AFM/DOD.
The 6l80 was worse than the 4l60 in practice. But yes that gen 3 platform was invincible. My 209k 5.3 and 322k 6.0, and both 4 speeds have all original internals inside and i do extended oci's on syn blend diesel oil or euro oil at times. Owned both since new. Front and rear diffs and transfer case are also still good. Just oil.the majority of 5,3 have the 4l60e which is weaker than 6l80 . any 5.3 before 2008 is a safe bet. best engine i have ever owned by a lot
This ^^^^I don't "trust" any AFM engine past 200,000 miles, The locking mechanism in the AFM Lifters wear causing them to stick in the collapsed position. This is the one failure mode that WILL happen eventually. Though I've had pretty good luck "Unlocking" collapsed lifters & disabling the AFM via tuning software.
Lifter Roller/Cam "Spalling" & Lifter Guide failures allowing the lifter/s to rotate can happen to any LSx engine. Though I'd say these failure modes are rare.
6L80E torque converter failures are less frequent in the GMT900 platform because the calibration differences between it & the K2XX platform.
The K2XX platform has serious issues with converter clutch failures after @ 100,000 miles. The Thermostat Bypass Mod is great & all.....But it WILL NOT prevent a converter failure, Like a bandaid on a GSW in my opinion.
Had a 76,000 mile 2017 K2XX Silverado in this past week with intermediate TCC Shudder. I first put a "No TCC Slip" custom calibration in the TCM along with disabling the AFM.
Completely cured the shudder sensation, However.....Quick throttle tip-in would cause spikes in TCC Slip. I maxed out TCC Pressure just to see what would happen, It didn't help.
Installed a twin disc Billet Front Converter along with a couple TransGo kits in the Valve Body, Fluid & Filter, & TransGo Thermostat Bypass kit.
Cleared the adaptives, Performed a quick learn, Then performed a couple thorough test drives.....It's like a totally different unit!
A lot of the clunkiness in K2XX 6L80E's is from the TCC being applied in lower gears for the sake of MPG. Calibrate it to apply only in 4th-5th-6th or 5th & 6th goes a long way!
They have AFMYes there are a few 11 and 12 Yukons in my area with the 6.2. Kind of where I was looking,, price-wise
What brand/model of converter do you recommend? I have a ‘14 Sierra with about 77k miles…planning to change out the TC proactively.I don't "trust" any AFM engine past 200,000 miles, The locking mechanism in the AFM Lifters wear causing them to stick in the collapsed position. This is the one failure mode that WILL happen eventually. Though I've had pretty good luck "Unlocking" collapsed lifters & disabling the AFM via tuning software.
Lifter Roller/Cam "Spalling" & Lifter Guide failures allowing the lifter/s to rotate can happen to any LSx engine. Though I'd say these failure modes are rare.
6L80E torque converter failures are less frequent in the GMT900 platform because the calibration differences between it & the K2XX platform.
The K2XX platform has serious issues with converter clutch failures after @ 100,000 miles. The Thermostat Bypass Mod is great & all.....But it WILL NOT prevent a converter failure, Like a bandaid on a GSW in my opinion.
Had a 76,000 mile 2017 K2XX Silverado in this past week with intermediate TCC Shudder. I first put a "No TCC Slip" custom calibration in the TCM along with disabling the AFM.
Completely cured the shudder sensation, However.....Quick throttle tip-in would cause spikes in TCC Slip. I maxed out TCC Pressure just to see what would happen, It didn't help.
Installed a twin disc Billet Front Converter along with a couple TransGo kits in the Valve Body, Fluid & Filter, & TransGo Thermostat Bypass kit.
Cleared the adaptives, Performed a quick learn, Then performed a couple thorough test drives.....It's like a totally different unit!
A lot of the clunkiness in K2XX 6L80E's is from the TCC being applied in lower gears for the sake of MPG. Calibrate it to apply only in 4th-5th-6th or 5th & 6th goes a long way!
I installed a Presion brand, pt# p4646, cost about $225. I don't tow or hot rod my 07 Yukon w/6L80e.What brand/model of converter do you recommend? I have a ‘14 Sierra with about 77k miles…planning to change out the TC proactively.
What brand/model of converter do you recommend? I have a ‘14 Sierra with about 77k miles…planning to change out the TC proactively.
I've heard good stuff about Circle DUse Circle D out of Houston, TX for higher stall/competition converters.
Not in a Yukon Denali2007 and 2008 will be a 4L60.
Correct, but OP asked about a 5.3 which would eliminate a Denali.Not in a Yukon Denali
07 & 08 Denali come w/6.2L without AFM/DOD and a 6L80e tranny