TRANSGO ALLISON-11UP ALLISON HP REPROGRAMMING VALVE BODY KIT FOR 2011-2019 GM 2500HD/3500HD LML/L5P

Product Description

Upgrade your Allison for harder towing, better clutch holding power, and sharper transmission response with the TRANSGO ALLISON-11UP Allison HP Reprogramming Valve Body Kit. Built for 2011-2019 GM Silverado and Sierra 2500HD/3500HD trucks with the 6.6L Duramax LML or L5P, this high-performance reprogramming kit is engineered for work trucks, tuned trucks, and heavy-duty street builds that demand stronger line rise, quicker clutch apply, improved converter clutch holding, and more dependable shift performance under load. transgo allison-11up, allison hp reprogramming valve body kit, 2011-2019 duramax transmission upgrade, lml valve body kit, l5p valve body kit, allison 1000 2000 shift improvement, higher tcc holding capacity, firm crisp upshifts, low line pressure fix, 3-4 slip prevention, burnt frictions prevention, heavy duty towing transmission upgrade, gm 2500hd 3500hd duramax transmission performance kit

The ALLISON-11UP kit uses TransGo’s performance-calibrated pump and valve body components to produce smart, on-demand pressure increases for faster line rise and stronger clutch apply without pushing pressure to unsafe levels. It is designed to help correct or prevent sloppy shifts with ratio codes, no forward movement, 3-4 slip, burnt frictions, and low line pressure while maintaining a factory-like feel at lighter throttle with progressively firmer shifts as load and throttle increase.

This is an ideal upgrade for Duramax owners who tow heavy, run custom tuning, or want a more confidence-inspiring Allison transmission without sacrificing drivability.

Fitment

• 2011 GM Silverado 2500HD / 3500HD 6.6L Duramax LML
• 2012 GM Silverado 2500HD / 3500HD 6.6L Duramax LML
• 2013 GM Silverado 2500HD / 3500HD 6.6L Duramax LML
• 2014 GM Silverado 2500HD / 3500HD 6.6L Duramax LML
• 2015 GM Silverado 2500HD / 3500HD 6.6L Duramax LML
• 2016 GM Silverado 2500HD / 3500HD 6.6L Duramax LML
• 2017 GM Silverado 2500HD / 3500HD 6.6L Duramax L5P
• 2018 GM Silverado 2500HD / 3500HD 6.6L Duramax L5P
• 2019 GM Silverado 2500HD / 3500HD 6.6L Duramax L5P
• 2011 GM Sierra 2500HD / 3500HD 6.6L Duramax LML
• 2012 GM Sierra 2500HD / 3500HD 6.6L Duramax LML
• 2013 GM Sierra 2500HD / 3500HD 6.6L Duramax LML
• 2014 GM Sierra 2500HD / 3500HD 6.6L Duramax LML
• 2015 GM Sierra 2500HD / 3500HD 6.6L Duramax LML
• 2016 GM Sierra 2500HD / 3500HD 6.6L Duramax LML
• 2017 GM Sierra 2500HD / 3500HD 6.6L Duramax L5P
• 2018 GM Sierra 2500HD / 3500HD 6.6L Duramax L5P
• 2019 GM Sierra 2500HD / 3500HD 6.6L Duramax L5P
• Fits Allison 1000 / 2000 6-speed applications for these model years

Features & Benefits

• Firm, crisp upshifts for added durability and performance
• Increased TCC holding capacity
• Maintains factory shift feel at light to medium throttle
• Progressively firmer shifts through wide-open throttle
• Customizable shift-feel calibrations for stock, towing, and performance builds
• Engineered for stock or tuned work and performance trucks
• Helps prevent 3-4 slip, low line pressure, and burnt frictions

What’s Included

• High-performance pressure regulator spring
• Calibrated main control valve and spring
• Re-engineered TCC regulator valves for early and late designs
• Replacement main mod spring
• Recalibrated PCS 1 and PCS 2 springs
• Billet 1-2-3-4 back-feed retainer
• Extension and pump housing gaskets

Specifications for TRANSGO ALLISON-11UP

FAQ

What does the TransGo ALLISON-11UP kit improve?

This kit improves shift quality, clutch holding power, torque converter clutch holding capacity, and overall transmission durability for 2011-2019 Allison-equipped Duramax trucks.

Is this kit good for towing and tuned trucks?

Yes. TransGo designed this kit for stock, hard-working, towing, and performance applications, making it a strong option for trucks that see heavy load or added power.

What transmission problems can this kit help correct?

It is built to help correct or prevent sloppy shifts with ratio codes, no forward movement, 3-4 slip, burnt frictions, and low line pressure.

Will this make the transmission shift harsh all the time?

No. One of the benefits of the ALLISON-11UP kit is that it can maintain a near-factory feel at lighter throttle while delivering progressively firmer shifts as throttle increases.

Does installation require transmission removal?

Yes. The TransGo installation documentation states that transmission removal is required for this kit.