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Suncoast logo GM Allison 5-6 Speed Conversion 2001-2005
Allison 5-6 Speed Conversion 2001-2005
2001-2005 GM Durmax

free shipping special with no handling fees
Convert your 5 Speed Allison into a 6 Speed via a new TCM and 6 Speed Valve Body


Drops 325 engine rpm @ 75 mph with 3.73 gears. Increases fuel economy 1 – 1.5 MPG, reduces engine noise while cruising, a truck with 3.73 gears that normally likes cruising at 62 MPH will now cruise nice at 72 MPH. The gear ratio in your 5 speed is .71 and our 6th gear will be .61. 6th gear can be disabled with your two haul button and 5th canceled with OD off. Requires valve body and tcm change (1 hour). No wiring, no modifications required. Indicate LB7 or LLY & year.

NOTE: Suncoast orders require the year, make, and model of your truck to be placed in the comments field upon checkout to ensure your order is processed as soon as possible.
GM Valve Body
Year Price Core Order
5-6 speed conversion Valve Body & TCM
Fits Duramax Years: 2001-2005
Part # A1-6VB-TCMK
Our Part # SUNA1-6VB-TCMK
01-05 $1,888.00
free shipping special with no handling fees
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