Xcalliber

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Xcalliber Xcalliber has specialized in repairing, replacing, and upgrading Allison transmissions since 1984 and offers a full line of stock and performance parts.

Whether you have a GM Duramax truck or a fleet of commercial vehicles, Xcalliber has you covered.

Engineered for demanding applications, the Alto G3 Performance Clutch Packs offer increased torque capacity and smoother...
09/17/2026

Engineered for demanding applications, the Alto G3 Performance Clutch Packs offer increased torque capacity and smoother shifts.

FEATURES + BENEFITS:
• Higher torque
• Reduced burnout
• Improved shifts with less vibration
• Fits all model years — LB7, LLY, LBZ, LMM, LML, L5P
• 5 Speed + 6 Speed
• Proudly made in America 🇺🇸

SHOP NOW:
https://www.xcallibertransmission.com/product-category/allison-1000-gm-duramax-series/performance-parts-allison-gm-duramax-150/performance-clutches-and-clutch-packs-150/

In honor of Labor Day, we’ll be closed Monday, September 7. Enjoy the holiday weekend! 🇺🇸
09/02/2026

In honor of Labor Day, we’ll be closed Monday, September 7.

Enjoy the holiday weekend! 🇺🇸


To the fallen, the families who loved them, and the veterans who carry their memory — we honor you today and every day. ...
05/22/2026

To the fallen, the families who loved them, and the veterans who carry their memory — we honor you today and every day.

In observance of Memorial Day, we'll be closed on Monday, May 25. 🇺🇸

Save on 1K/2K Seal and Gasket Kits (Less Piston Kits) for your Allison transmission.29545311-LP (LB7/LLY) ➡️ $162.50eaOr...
05/20/2026

Save on 1K/2K Seal and Gasket Kits (Less Piston Kits) for your Allison transmission.

29545311-LP (LB7/LLY) ➡️ $162.50ea
Order now: https://www.xcallibertransmission.com/product/29545311-lp-df/

29545312-LP (LBZ/LMM) ➡️ $174.99ea
Order now: https://www.xcallibertransmission.com/product/29545312-lp-df/

29547606-LP (LML/L5P) ➡️ $188.00ea
Order now: https://www.xcallibertransmission.com/product/29547606-lp-df/

We assemble these kits in house — In the U.S.A. 🇺🇸

Additional discounts may apply for Platinum and Black Dealers.

The ONLY American-made performance hubs, carriers, and shafts come from Xcalliber. Upgrade your Allison transmission and...
04/10/2026

The ONLY American-made performance hubs, carriers, and shafts come from Xcalliber.

Upgrade your Allison transmission and keep it American. Get your billet parts at XCALLIBER.COM. 🇺🇸


We’re proud to share this kind recognition from Veterans Park Elementary. We’re always happy to support our local school...
02/27/2026

We’re proud to share this kind recognition from Veterans Park Elementary. We’re always happy to support our local schools.

Customize a renewed Allison 1000 transmission for your GM Duramax pickup — LB7, LLY, LBZ, LMM, LML, or L5P.Renewed stock...
01/05/2026

Customize a renewed Allison 1000 transmission for your GM Duramax pickup — LB7, LLY, LBZ, LMM, LML, or L5P.

Renewed stock transmissions are in stock and ready to ship, and performance models are available from 500–2,000 HP.

Features and Benefits:

• Dyno-tested — In stock, ready to ship
• Complete with the latest upgrades
• Contains the most new parts in the industry
• New coolers in stock
• ATF in stock
• Free return freight on core (continental U.S.)

To order your renewed Allison transmission, call 800.682.1290, email [email protected], or customize your build online by clicking here:
https://www.xcallibertransmission.com/renewed-allison-transmissions/

Xcalliber’s renewed Allison transmissions are in stock and ready to ship.Available Series:• Allison 1000 / 2000 / 2500• ...
01/05/2026

Xcalliber’s renewed Allison transmissions are in stock and ready to ship.

Available Series:

• Allison 1000 / 2000 / 2500
• Allison MD3000 / B400 / T200
• Allison HD4000 / B500 / T400
• Legacy transmissions (AT / MT / HT)

Features and Benefits:

• Dyno-tested — In stock, ready to ship
• Complete with the latest upgrades
• Contains the most new parts in the industry
• New coolers and cooler kits in stock
• Yokes in stock
• Flywheels and ring gears in stock
• TCMs and shift selectors in stock
• Free return freight on core (continental U.S.)

To order your renewed Allison transmission, call 800.682.1290, email [email protected], or request a quote by clicking here:
https://www.xcallibertransmission.com/renewed-allison-transmissions/

There’s still tread left on the tire…So we’ve extended our Black Friday Sale for today only. Shop Xcalliber.com now to s...
12/01/2025

There’s still tread left on the tire…

So we’ve extended our Black Friday Sale for today only. Shop Xcalliber.com now to save on performance parts for your Allison transmission.

🏁 SAVE 10% on Allison performance upgrade kits 🏁
• 29545311-X
• 29545311-XX
• 29545311-###
• 29545312-X
• 29545312-XX
• 29545312-###
• 29547606-X
• 29547606-XX
• 29547606-###
• CL1000-XX

🏁 SAVE 15% on all Allison performance upgrade billet shafts 🏁
• 29539506-X
• 29548947-X
• 24281105-X
• 29536984-X
• 29546284-X
• 29531252-X
• 29547444-X
• HPSHAFTKIT-L5P-X
• HPSHAFTKIT-LML-X
• HPSHAFTKIT-X

🏁 SAVE 20% on the below Allison performance billet hard parts 🏁
• 29544804-X
• 29546705-X
• 29546706-X

XCALLIBER.COM

Platinum and Black Dealer discounts will be applied.

Valid now through midnight, December 1, 2025. Performance part numbers must end in "X" to qualify. Cannot be combined with other offers. While supplies last.

Your Allison transmission needs this sale…🏁 SAVE 10% on Allison performance upgrade kits 🏁 • 29545311-X• 29545311-XX• 29...
11/27/2025

Your Allison transmission needs this sale…

🏁 SAVE 10% on Allison performance upgrade kits 🏁
• 29545311-X
• 29545311-XX
• 29545311-###
• 29545312-X
• 29545312-XX
• 29545312-###
• 29547606-X
• 29547606-XX
• 29547606-###
• CL1000-XX

🏁 SAVE 15% on all Allison performance upgrade billet shafts 🏁
• 29539506-X
• 29548947-X
• 24281105-X
• 29536984-X
• 29546284-X
• 29531252-X
• 29547444-X
• HPSHAFTKIT-L5P-X
• HPSHAFTKIT-LML-X
• HPSHAFTKIT-X

🏁 SAVE 20% on the below Allison performance billet hard parts 🏁
• 29544804-X
• 29546705-X
• 29546706-X

Shop XCALLIBER.COM now.

Platinum and Black Dealer discounts will be applied.

Valid Thursday, November 27 through midnight, November 30, 2025. Performance part numbers must end in "X" to qualify. Cannot be combined with other offers. While supplies last.

Address

115 Commerce Road
Brookfield, CT
06804

Opening Hours

Monday 8am - 5pm
Tuesday 8am - 5pm
Wednesday 8am - 5pm
Thursday 8am - 5pm
Friday 8am - 4:30pm

Telephone

+18006821290

Website

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