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Spelab

TCM Tuning Kit

$1,047.98

SKU: SPCI08599-IS08196SR

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Free Shipping over $200
$100 Minimum Order
Non-Returnable Item
INSTALL DIFFICULTY
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Professional / shop required

Overview

The Spelab L5P TCM Tuning Kit is a transmission calibration package designed for 2017-2026 GMC and Chevy 6.6L Duramax L5P trucks. This kit allows you to license your factory TCM and upload pre-built tune files. It recalibrates shift timing, shift points, torque converter lockup behavior, and transmission hydraulic line pressure without requiring any physical component replacement.
Show original supplier description
The Spelab L5P TCM Tuning Kit offers advanced transmission calibrations specifically for 2017–2026 GM Duramax L5P trucks, engineered to complement upgraded powertrains. This kit functions by licensing your existing factory TCM and uploading pre-built tune files, eliminating the need for any physical component replacements. The kit meticulously recalibrates key transmission functions, including shift timing, shift points, torque converter lockup behavior, and transmission hydraulic line pressure. It features redesigned shift maps to better handle heavy diesel hauling and daily driving, custom shift point calibration that goes beyond OEM limits, and precisely calibrated shift timing for smooth, predictable gear changes. The optimized torque converter lockup logic reduces slippage under load and enhances fuel efficiency, while recalibrated transmission line pressure ensures firmer clutch clamping for reliable torque handling. Compatibility is based on the TCM model: the T87A unit is used for 2017–2019 models (6 and 10-speed transmissions), and the T93 unit is for 2020–2026 diesel applications (10-speed). An OBD2 Flash Tuning Interface is required, and the kit includes 4 OBD2 Tuning Credits. This product is intended for off-road use only and is a final sale, non-refundable item. It is exclusively for L5P diesel applications and does not fit gas engine trucks. The interface requires a Windows-based laptop for operation; Apple products will not work.

Product descriptions are provided by our supplier partners and may not always be perfectly accurate. Not sure this fits? or call (760) 282-4645 and we’ll verify before you order.

Fitment

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Specifications

BrandSpelab
Part NumberSPCI08599-IS08196SR
CategoryTools
5,000+ Trusted brands
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Returns & Fitment

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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Shipping

Orders are processed in 1–3 business days. In stock parts ship promptly from our partner network. Special-order items either aren’t currently stocked or are built to your spec — expect 4–6 weeks. If a part goes on backorder while your order is in the queue, we’ll reach out and work through discounted alternatives together.

Free shipping over $200 in the continental US. Alaska, Hawaii, U.S. territories (Puerto Rico, U.S. Virgin Islands, Guam, American Samoa, and the Northern Mariana Islands), and international orders carry surcharges — most appear at checkout. Some exceptions (LTL freight, or suppliers who quote freight only after we place the order) won’t. In those cases we’ll reach out with the exact charge before your order moves forward.

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