06 LBZ. RPO code for the truck says 3.73 gears. Trans tune says H0103 is 4.10, H0122 is 3.73. Which one is the gear ratio? What's the difference between the two? Shouldn't they be the same?
I'm confused!
06 LBZ. RPO code for the truck says 3.73 gears. Trans tune says H0103 is 4.10, H0122 is 3.73. Which one is the gear ratio? What's the difference between the two? Shouldn't they be the same?
I'm confused!
I think I remember hearing that all the TCMs say 4.10s even if the truck has 3.73s or whatever other gears.
~Erik~
2013 Sonic RS Manual - 1.4L I4T E78, tuned, turbo mods, etc.
2008 TrailBlazer SS 3SS AWD Summit White - LS2 E67/T42, bolt ons, suspension, etc.
2002 Chevy TrailBlazer LT 4X4 Summit White - 4.2L I6 P10, lifted, wheels, etc.
All the TCM's are set to 4.10 gears. This has nothing to do with the speedo in the truck, but how the TCM sees the speed reading. The general consensus is leave the TCM settings alone for the speedo as it uses the 4.10 ratio for figuring shift times and torque numbers. By changing it you will essentially change all of your shift times and cause tie-ups which will destroy your ALLISON.
1995 GMC 2500 SUBURBAN powered by 01 DURAMAX/ALLISON, little of this, a little of that,
DIAMONDEYE 4" exhaust, CORSA muffler, AFE stage 1 dry filter, custom tuning by me, KENNEDY single pump and pump rub kit.
'07 TBSS, LS2, T42, 3SS, Black on Black on Black, Pretty much stock at the moment. EFILive will fix that
'06 LBZ/Allison 6speed, EC, LB, 1LT, Leather
Current Mods: EFI Live/ PTO High Idle Mod/ Factory Exhaust Brake / BD Full Bore/ TransGo Jr./ TTS Twin Lift Pumps/ MBRP 4" turbo back/ Custom air box mod/ BullyDog Outlook Monitor
465hp/1008tq---7/25/09---Dyno Day Fast Specialties Tuning by ME
Ok so if my speedo is off I need to change it in the ECM then instead of the TCM?
yes that is correct
'07 TBSS, LS2, T42, 3SS, Black on Black on Black, Pretty much stock at the moment. EFILive will fix that
'06 LBZ/Allison 6speed, EC, LB, 1LT, Leather
Current Mods: EFI Live/ PTO High Idle Mod/ Factory Exhaust Brake / BD Full Bore/ TransGo Jr./ TTS Twin Lift Pumps/ MBRP 4" turbo back/ Custom air box mod/ BullyDog Outlook Monitor
465hp/1008tq---7/25/09---Dyno Day Fast Specialties Tuning by ME