1964-1967 A-Body LS Trans Mount Adapters

Transmission mount adapters for 1964-1967 A-Body LS swaps in the Chevelle, El Camino, GTO and Tempest, Cutlass and 442, and Skylark. There are two for TR-6060 manuals and two for the 6L90E, 8L90E and 10L90E. Expect tunnel surgery: these early A-Bodies have small tunnels.

Small tunnel: plan on cutting it
Crossmember varies by transmission
Manual adapters include hardware

The 1964-1967 A-Body LS install guide walks through the tunnel cuts and filler panel. For the conversion kit, Sure-Fit crossmember and headers, see the 1964-1967 A-Body LS swap parts 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

1964-1967 A-Body transmission mount adapter parts

For the TR-6060 six speed

For 6L90E, 8L90E and 10L90E automatics

Adapter specs

T-56 / TR-6060 adapter: 3/16 inch steel, CNC bent.
Powder coated black and sold with hardware.
MG9 adapter: matches the TR-6060 used with the LSA.
Automatic adapters pair with BRP crossmembers.

1964-1967 A-Body transmission notes

Tunnel changes are needed with the T56, TR6060, 6L80E, 6L90E, 8L90E and the 4L60E through 4L80E family.
When ordering, give year, make, model, convertible or hardtop, and your transmission. Crossmembers vary by type.
Tunnel work starts with a 30 to 32 inch cut down the top center, from the firewall to the front of the floor support.
Add an 18 to 20 inch cross cut at the bellhousing crease and a 10 to 12 inch cut at the rear, then open the tunnel.
Close the gap with a welded or riveted filler panel and seam sealer. OEM-type carpet still covers it.
A gold preload plate and spacers sit between the polyurethane mount and the transmission.

Notes from the 1964-1967 A-Body LS install guide.

1964-1967 A-Body LS transmission mount adapter FAQ

Does a 1964-1967 Chevelle need tunnel work for a TR-6060 or 6L90E?

Yes. The guide says the 1964-1967 A-Body tunnels are small and need modifying for the TR6060, 6L90E and 8L90E, along with the T56, 6L80E and the 4L60E through 4L80E.

What should I tell BRP when I order?

Your year, make, model, body style (convertible or hardtop) and transmission. The guide notes the crossmembers vary by transmission type.

Will carpet still fit after the tunnel is opened up?

The guide says OEM-type carpet will still cover the modification once the filler panel is in and sealed.

Do the A-Body frame brackets need new holes?

No. The guide says the frame mounts and outer crossmember brackets bolt into existing holes in the frame.