Silverado & Sierra T56 Swap Bracket (1999-2006)

T56 Transmission Mount Adapter Bracket
(2WD Late 2000–2006 GMT800 Chevy Silverado / GMC Sierra | Gen 3/4 LS Swap)

Make your T56 bolt in like it belongs there.

The Desert Style MFG T56 Transmission Mount Adapter Bracket adapts your T56 to the factory GMT800 transmission mount and crossmember — no fabrication, no guesswork.

Designed specifically for GMT800 LS swaps, this bracket lets you run OEM components for a clean, repeatable install.

WHAT THIS BRACKET DOES
∙ Bolts directly to your T56 transmission
∙ Adapts the T56 to the factory GMT800 transmission mount
∙ Allows use of the OEM GMT800 crossmember
∙ Maintains proper transmission height and driveline geometry

REQUIRED OEM PARTS (NOT INCLUDED)
Factory Manual Crossmember: GM Part #15040426
Manual Transmission Mount: GM Part #15820075

Note: These are the factory manual transmission crossmember and mount. 1999–early 2000 trucks used a different crossmember with offset frame pickup points and are NOT compatible. Automatic transmission trucks (4L60E) used a different crossmember and compatibility with those has not been confirmed.
Available used from any late 2000–2006 GMT800 donor truck equipped with a manual transmission.

WHAT’S INCLUDED
∙ Desert Style MFG T56 Mount Adapter Bracket
∙ All required mounting hardware

FITMENT
✔ 2WD Late 2000–2006 Chevy Silverado 1500 / GMC Sierra 1500
✔ Gen 3 LS (LS1, LS6)
✔ Gen 4 LS (LS2, LS3, L99)
✔ 2004–2007 Gen 1 Cadillac CTS-V T56 (recommended donor)
✔ Proper bellhousing depth required
✔ Requires factory manual transmission crossmember — see part numbers above

COMPATIBLE T56 DONOR
This bracket is designed and tested around the Gen 1 CTS-V T56 (2004–2007). The CTS-V uses a flanged bolt-on output yoke — not a slip yoke. That is the unit this bracket is built for.

The following T56 variants have different tail housings and are NOT confirmed fitments:
✖ F-body Camaro / Firebird T56
✖ C5 / C6 Corvette T56
✖ Pontiac GTO T56
✖ Dodge Viper T56
✖ T56 Magnum / TR-6060

Not sure which T56 you have? Check your tail housing. If it has a flanged bolt-on yoke, you’re good. If it has a slip yoke, it’s the wrong unit.

WILL NOT WORK WITH
✖ 1999–early 2000 GMT800 trucks (different crossmember)
✖ 4L60E automatic crossmember (not confirmed compatible)
✖ 4WD GMT800 trucks
✖ Non-LS engine setups
✖ Incorrect bellhousing depth
✖ F-body, GTO, Corvette, or Viper T56 variants
✖ Non-GMT800 platforms

Laser cut. Precision formed. Designed specifically for GMT800 LS swaps.

If you’re putting a T56 in your truck, don’t hack it together. Mount it correctly the first time.

Stay sideways. Build different.
— Desert Style MFG​​​​​​​​​​​​​​​​