In a stock Allison 5 speed TCM H0105 is 4000 and in the Duramax LB7 ECM H0101 is 101605. Why don't these two match?
Also why is the TCM final drive ratio H0103 4.10 when all Duramax truck have 3.73 gears
In a stock Allison 5 speed TCM H0105 is 4000 and in the Duramax LB7 ECM H0101 is 101605. Why don't these two match?
Also why is the TCM final drive ratio H0103 4.10 when all Duramax truck have 3.73 gears
Because that is how ALLISON set them up. There is no reason to change them as it will change hundreds of other tables you cannot see or modify. ALL of the tables reference these tables, and even small changes can REALLY change how the TCM reacts. It can render grade braking inoperable, or make it come in when it shouldn't, and changes ALL of your shift points(and timing).
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.
I am wondering if anyone has pinned down the loss/change of grade braking to a specific table change.
Michael, Systems Engineer 04.5 D-max LLY, Phoenix, Arizona Email
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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.