73-87 C10 LS Trans Mount Adapters

Square body C10 and C15 trucks, plus 2WD Blazer and Jimmy, can run a late GM gearbox behind an LS with these adapters. They bolt to a TR-6060, CTS-V T-56, MG9, 6L90E, 8L90E or 10L90E tailshaft so it sits on a regular mount.

Bracket location set by your transmission
Brackets sit 3 inches above the frame lip
2WD crossmember sold separately

Bracket height and drilling are covered in the 1973-1987 2WD GM truck LS install guide. Engine mounts, headers and tanks are on the 1973-1987 2WD GM truck LS swap page.

$39.99 Cadillac CTS-V T-56 / standard TR-6060 Trans Mount Adapter

$39.99 MG9 high-torque TR-6060 Trans Mount Adapter

$39.95 Cadillac CTS-V 6L90E Transmission Mount Adapter

Square body LS transmission mount adapters

Manual transmission adapters

Automatic transmission adapters

Finding the adapter for your truck

Square body with a CTS-V T-56 or Camaro TR-6060: the jig welded adapter, black powder coat, hardware in the box.
An MG9, the TR-6060 variant behind the CTS-V LSA, needs the MG9 adapter.
Order the 6L90E adapter for a 2009-2014 CTS-V automatic.
Truck builds with an 8L90E or 10L90E use the one 8L90E adapter, designed for BRP crossmembers.

1973-1987 2WD truck transmission notes

The transmission you pick decides where the outer crossmember support brackets land, front to rear.
The truck guide sets bracket height at 3 inches from the bracket bottom to the bottom of the frame lip.
New bracket holes are drilled with a 3/8 inch bit.
A polyurethane mount, gold preload plate and spacers install on the transmission before the crossmember goes up.
The same guide covers 1973-1991 2WD Blazer and Jimmy SUVs.
BRP lists its 1973-1987 GM truck crossmember as 2WD only.

Notes from the 1973-1987 2WD GM truck LS install guide.

1973-1987 C10 LS transmission mount FAQ

Where do the crossmember brackets go on a square body?

The 2WD truck guide says your transmission sets the fore and aft spot, and the brackets sit 3 inches from their bottom to the bottom of the frame lip.

Does the truck guide list which transmissions fit?

No. It explains bracket placement by transmission but does not name specific gearboxes.

Will this work on a 4x4 square body?

The 1973-1987 truck crossmember BRP lists is 2WD only. BRP has a separate 4WD truck guide.

Does a 1985 Blazer use the same parts?

The guide covers 1973-1991 2WD Blazer and Jimmy along with the 1973-1987 2WD trucks.

1973 - 1987 2WD GM Truck LS Transmission Mount Adapters