flashing 6spd allison os into 5spd allison tcm

[Scarface]

has any one done this conversion on a 5 spd Allison taking the 5 spd tcm and flashing a 6spd os into the tcm and making it work

[Cougar281]

Nope. Can't be done. The 5-speed and 6-speed TCMs are totally different. Only way to do it without suncoasts hacked TCM is to convert from lb7/lly to all LBZ electronics, top end and trans.

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[Scarface]

guess time for me to sit done and figure it all out. cause how suncoast and two other companies sell it all day long and ask for a 5 spd tcm as a core in return. time to sit down and figure it all out. just saying.

[t.ashton]

Yep, electronics communicate differently


2004 Silverado Cali lb7, Airdog ll 165, fresh sticks at 325k, Custom tune on v2 for daily driver, 33x12.5 nitro at on 20 inch American steal wheels, modded factory air box, Profab Intake Horn, Batmo Wheel, Turbo port and polish, Full EGR Removed w/ fed belt, 3.5 inch MBRP Downpipe, Full five inch MBRP Exhaust axle dump, 10mm lbz cp3 pump, Dual Yellow Top Optimas, High Output Alternator, Cognito Pittman and idler w/ support kit, Cognito Contol arms, Drilled and Slotted Rotors on all four Corners, FEd Y Bridge.

[Cougar281]

guess time for me to sit done and figure it all out. cause how suncoast and two other companies sell it all day long and ask for a 5 spd tcm as a core in return. time to sit down and figure it all out. just saying.
Those are some kind of 'hacked' calibration and a custom VB. You cant just run a 2006+ 6-speed VB with a 3rd gen TCM. It'll never be right. I tried it.

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[Chavez91]

Its not to hard to get it going. The part that is going to kill you is getting it calibrated. Shift quality calibrations are what will make or break your 6 speed conversion. Fleece and Socals calibrations SUCK IMO as im sure they had no idea what tables are actually involved and what they actually adjust. The 5 speeds have provisions for 6th gear. But most 6 speed stuff is either blank or disabled.

[THEFERMANATOR]

guess time for me to sit done and figure it all out. cause how suncoast and two other companies sell it all day long and ask for a 5 spd tcm as a core in return. time to sit down and figure it all out. just saying.

They use a 5 speed TCM, but it is NOT a factory 6 speed TCM tune. The 6 speed TCM is a GEN IV a40 or newer style TCM. The 5 to 6 speed conversion kits use a 5 speed TCM tune that has been hacked to add in 6th gear. It has NOTHING in common with a factory 6 speed tune or TCM other than it has 6 gears. There is another tuner out there who used to sell the 6 speed tune, and you could use a 6 speed valve body and modify the tune file to operate the newer lockup solenoid(drop max duty cycle back from 99% or whatever it is back to 67% which is max for the stock 6 speed solenoid) and make it work as quite a few people did it. It was a hacked copy of the 04.5-05 conversion kit, so you had to do something about the missing G solenoid if you used it in a LB7, and there was no way to lockout 5th if you put it in an 01-02.

[killerbee]

guess time for me to sit done and figure it all out. cause how suncoast and two other companies sell it all day long and ask for a 5 spd tcm as a core in return. time to sit down and figure it all out. just saying.

I can provide a 6-speed AL5 (01-05) TCM, with or without a core. PM me if that is the direction you want to go.

[Scarface]

it is on a 05 lly truc. pm u killer bee

[pc3332132]

I can provide a 6-speed AL5 (01-05) TCM, with or without a core. PM me if that is the direction you want to go.

Do you still have these available?