Tools› Engine-Related

Spelab

L5P TCM Tuning Kit

$1,047.98

SKU: SPCI08599-ES08074-ES08071

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Overview

The Spelab L5P Transmission TCM Tuning Kit is a transmission control module enhancement designed for 2017-2026 GMC and Chevy 6.6L Duramax trucks. This kit recalibrates shift timing, shift points, torque converter lockup, and transmission hydraulic line pressure. It requires no physical component replacement, working with your existing T87A or T93 TCM units.
Show original supplier description
The Spelab L5P Transmission TCM Tuning Kit is a transmission control module enhancement specifically engineered for 2017–2026 GMC and Chevy 6.6L Duramax trucks with L5P engines. This kit offers premium transmission calibrations, perfectly optimized to complement upgraded powertrains. It functions by licensing your factory TCM and uploading pre-built tune files, which recalibrate shift timing, shift points, torque converter lockup behavior, and transmission hydraulic line pressure. Key features include redesigned shift maps to accommodate heavy hauling and daily driving, custom shift point calibration to surpass OEM limits, and precisely calibrated shift timing for smooth, consistent gear changes. The torque converter lockup logic is revised to reduce slippage under load and improve fuel efficiency, while transmission line pressure is recalibrated for firmer clutch clamping to reliably handle increased torque output. This tuning package is fully compatible with stock T87A (2017–2019) and T93 (2020–2026) TCM units, requiring no additional hardware. An OBD2 Flash Tuning Interface is necessary to flash the tune file. This product is intended for off-road use only and is a final sale, non-refundable item. Compatibility is limited to L5P diesel applications and does not fit gas engine trucks. A Windows-based laptop is required for the tuning software.

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.

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Specifications

BrandSpelab
Part NumberSPCI08599-ES08074-ES08071
CategoryTools
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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.

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