Replacing Flexplate, what else is needed

DFletch said:

Recently took it into a transmission shop to get the transmission programmed and they said that the sound the trans was making was from a crack in the flex plate. They said that it shouldn’t be a problem for a while but it’ll be annoying as all heck lol. That’s why I want to replace it

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What required the transmission to be programmed? Sorry just curious

Doubeleive said:

What required the transmission to be programmed? Sorry just curious

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No problem, the transmission was replaced but never programmed, I found it it needed to be programmed when the tow mode wasn’t working lol

DFletch said:

No problem, the transmission was replaced but never programmed, I found it it needed to be programmed when the tow mode wasn’t working lol

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Hmm, never heard of that normally the transmission will not work unless it is programmed to the vin, tow mode is standard and is just a momentary ground to the bcm, shouldn't need programming for tow mode to work. But maybe I am missing some information?

@NickTransmissions ever hear of tow mode needing to be programmed separately?

DFletch said:

I have a 2008 Yukon XL Denali AWD with a 6L80 trans and a 6.2L engine. Since I’m going to be replacing the Flex Plate is there anything I should replace since I’m going to be in there? Also if there’s another Thread that already covered this please point me in its direction because I couldn’t find it

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here what I changed when I did the job 6 yrs and 68k miles ago:
Installed rear main seal & cover – Dorman 635-518 - $43
https://www.tahoeyukonforum.com/threads/rear-main-seal-job-pan-etc-07-yukon-denali-6-2.108334/
Performed GM TSB # 10-06-01-008M:
https://f01.justanswer.com/ebrock63...il+Consumption,+MIL+ON,+Engine+Runs+Rough.pdf
and used Gunk Motor Medic $5 to do the piston combustion chamber soak, replaced:
Valve cover driverside – GM# 12570427 - $117
Oil pan gasket – GM# 12612350 - $36
Oil pickup o-ring – Felpro 72401 or GM 12584922 - $9
Torque Converter – P4646 (gopnh.com) Precision- $218
Tranny front pump seal – GM# 24237531 - $30
Tranny Input shaft seal – GM# 24219390 - $10
AFM Deflector – gm#12639759 - $8
Trans cooler line 1 – ACDelco 15779543 - $16
Trans cooler lines 2 – ACDelco 25999420 - $56
Trans cooler clips- ACDelco# 24205103 - $10
Trans cooler gasket - $7
Front lower plastic cowl - $31
Starter – 6757N - $60
dogbone/barbell rear oil galley seal