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USD 2655
Part #: SCCA1-6VB-TCM-LLY

Sun Coast A1-6VB-TCM-LLY Allison 5-6 Speed Conversion

Vehicle Fitment:
2004.5-2005 GM 6.6L Duramax LLY | See full application list below
Part #: SCCA1-6VB-TCM-LLY
$2,950.00 $2,655.00
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Description

The Sun Coast A1-6VB-TCM-LLY Allison 5-6 Speed Conversion for your 2004.5-2005 GM 6.6L Duramax LLY converts your 5-Speed Allison A1000 Transmission into a 6-Speed like the later models. With the conversion, you can drop 325 engine rpm @ 75 mph with 3.73 gears. While increasing 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. No wiring, no modifications required.

Features:
  • Converts 5-Speed Automatic To 6-Speed
  • Decrease Cruising RPM's
  • No Wiring, No Modifications Required

Vehicle Fitment

YEAR MAKE FOR ENGINE SERIES
2004.5 Chevy 6.6L LLY Duramax
2005 Chevy 6.6L LLY Duramax
2004.5 GMC 6.6L LLY Duramax
2005 GMC 6.6L LLY Duramax

Specifications

  • MPN A1-6VB-TCM-LLY
  • SKU SCCA1-6VB-TCM-LLY
  • ID 25605
  • Manufacturer Name Sun Coast Converters
  • Shipping Weight 25.00 lb.
  • Shipping Length 10 in.
  • Shipping Width 14 in.
  • Shipping Height 14 in.
  • Fuel Type Diesel
  • Prop 65 Prop 65 WarningWARNING: Cancer & Reproductive Harm - P65Warnings.ca.gov
  • Internal L0R0

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Questions and Answers

What all comes in the kit?
View Staff Answer 
Answer

The TCM and valve body.


With this kit added to a 2005 5 speed trans. Will it down shift to 5th or drop to 4th when pulling hills? With this kit added to a 2005 5 speed trans. Will it down shift to 5th or drop to 4th when pulling hills?
View Staff Answer 
Answer

This could depend on the grade of hill, but in theory it will drop to 5 th gear from 6 th .

do i need to changed the ecm board on the trans
View Staff Answer 
Answer

The SUN COAST A1-6VB-TCM-LLY ALLISON 5-6 SPEED CONVERSION will come with everything needed to do the 5 to 6 speed conversion including tuning for the TCM.

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