GM converter upgrade question

[Denali GMC 87]

Hello folks. Have a Hopefully simple question to ask. My 2008 Denali has 220k. Runs smooth no issues shifts fine also. However I'm contemplating if I should upgrade the torque converter with the GM Zl1 style converter. The transmission fluid is dark and I figured maybe this would be cheap insurance to get a few more years out of it. My question is which part number would I order. I found this number upon research on another thread:

• 24045127
• Replaces:24240154, 24242552, 24242553
• 
  

Would this be worth doing also?

Thanks!

 

[Doubeleive]

Hello folks. Have a Hopefully simple question to ask. My 2008 Denali has 220k. Runs smooth no issues shifts fine also. However I'm contemplating if I should upgrade the torque converter with the GM Zl1 style converter. The transmission fluid is dark and I figured maybe this would be cheap insurance to get a few more years out of it. My question is which part number would I order. I found this number upon research on another thread:

• 24045127
• Replaces:24240154, 24242552, 24242553

Would this be worth doing also?

Thanks!

any brand name billet converter is what you want the gm one is the weak point

 

[Marky Dissod]

Hello folks. Have a Hopefully simple question to ask. My 2008 Denali has 220k.
Runs smooth no issues shifts fine also.
However I'm contemplating if I should upgrade the torque converter with the GM ZL1 style converter.
The transmission fluid is dark and I figured maybe this would be cheap insurance to get a few more years out of it.
My question is which part number would I order ...

any brand name billet converter is what you want.
the gm one is the weak point

Long story, as short as possible:
What he said. Avoid GM. You'll get more bang-for-your-buck from the aftermarket in terms of longevity and durability.

To make the story a little longer:
Did you delete or at least disable V4 mode? Or did yours not come with V4 mode?
If it has V4 mode (L94 yes, L9H no, L92 pre-disabled?), at least disable it if you can't delete it.

And if you need to disable V4 mode, you'd need a tune anyway.
That should also address increasing the durability of the torque converter clutch, in addition to everything else you can think of.

 

[donjetman]

This is what I installed in my 130k mile 6L80 5+ yrs and 64k miles ago:
https://gopnh.com/Search-Results?Partnumber=4646
<$220 then
Still going strong.

 

[Denali GMC 87]

It does not have the dod its the L92.

 

[Marky Dissod]

L92s do not use V4 mode. However,
there's a very small chance that it has V4 mode hardware, without V4 mode - pre-disabled.

 

[petethepug]

220k for an 08 Denali Orig trans is remarkable. I sold ours @ 140k and moved to an 09 at 140k because I discovered there was a TSB on a weak point in the 07 / 08 6L80 that led to a slip and eventually a failure in the 2-3 shift.

The 09 still had its Orig trans fail last year @ 172k but it bought me three more years after I sold the 08 Denali. If you’re the Orig owner and the trans is happy, keep changing the fluid and spend the dough on a total trans rebuild when you get to 300k. It’s just due and better to put a billet tc in a new trans than a 250k mi unit because labor for pulling trans is substantial.

Good year Denali to have. They’re quick little suckers.

 

[Denali GMC 87]

I'm not sure if it's the original transmission. Also. I am the 5th owner.

 

[91RS]

The CTS-V converter is not the same as a truck 6L80 converter (which really only became a major problem after 2015). The CTS-V converter is a dual clutch unit as is the 21+ 6L90 gasser converter which has an 1800 RPM stall. Circle D transmissions recommends both of those. I’ve decided to go with the CTS-V converter in both of mine for the slightly higher stall.

The aftermarket reman one with the billet housing is good also but is more expensive and has a stock stall.

In your case, I would not touch a 220k transmission. I wouldn’t spend the money to replace just a torque converter at that mileage. Save your money for a rebuild or replacement.