6 Speed Conversion Kit

Name: 6 Speed Conversion Kit
Brand: DuraMax Tuner
SKU: D06C DM1361070080900
Price: 2147.27 USD
Availability: InStock

$2,147.27

SKU: D06C DM1361070080900

In Stock

Ships by Jun 7

Free Shipping

Non-Returnable Item

DIY PRO SHOP

Moderate — 2–4 hours

Description

Upgrade your '01-'05 Allison 5-speed transmission to a 6-speed with this conversion kit from Duramax Tuner. This kit improves reliability, shift quality, and fuel economy, especially at highway speeds. It reduces RPMs by approximately 14% (around 300 RPM lower) during highway cruising, leading to less engine wear and tear, a quieter cabin, and improved fuel efficiency. The kit includes a new valve body, wiring harness, and solenoids, with custom TCM tuning tailored for your truck.

Fitment

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Available on iOS & Android

Specifications

Brand	DuraMax Tuner
Part Number	D06C DM1361070080900

Videos

Less Road Noise, Better Fuel Economy? The 6 Speed Conversion Kit Is What Your LB7 Or LLY Needs!

I CAN'T BELIEVE THIS DURAMAX 6 SPEED CONVERSION MADE THIS MUCH OF A DIFFERENCE!!

2005 GMC Sierra 2500HD - Duramax Tuner 6 Speed Conversion

We Need An Extra Gear - DIY 'Till I Die Ep. 4

Buy with Confidence

Built for enthusiasts. Every order is backed by our 30 day return window on eligible items. Unused and uninstalled products may be returned with approved RMA and no restocking fees when received in new condition. Orders placed through the MOTORMIA app with a complete build qualify for our Fitment Guarantee — free return shipping if the part doesn’t fit your exact setup. The guarantee covers fit only; installation must follow manufacturer instructions, and we recommend a qualified shop for parts marked Difficulty 4–5.

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