1964-1972 C10 LS Trans Mount Adapters

Transmission mount adapters for 1964-1972 2WD C-10 and C-15 LS swaps. They give a six-speed manual or a 6L90E, 8L90E or 10L90E automatic a conventional mount pad, and the truck guide says most late model gearboxes fit the factory tunnel unmodified.

Factory truck tunnel fits most late gearboxes
Covers TR-6060, MG9, T-56 and late autos
Crossmember position set by your transmission

Crossmember bracket drilling is shown in the 1963-1972 2WD GM truck LS install guide. Mounts, radiators and tanks are on the 1964-1972 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

1964-1972 C10 transmission mount adapters

Six-speed manual adapters for the C10

Late automatic adapters for the C10

Adapter by gearbox

CTS-V T-56 or a regular Camaro TR-6060: a laser cut, jig welded steel bracket in black powder coat.
MG9 high-torque TR-6060 from the CTS-V: a separate adapter with its own hardware.
2009-2014 CTS-V 6L90E: an adapter for that automatic tailshaft housing.
The 8L90E and 10L90E share one adapter meant for BRP crossmembers.

1963-1972 truck transmission notes

The guide names the 4L60E, 4L80E, 6L80E, 6L90E, 8L90E and six-speed manuals as fitting the stock tunnel.
Where the outer crossmember brackets go, fore and aft, depends on the transmission you choose.
Set the brackets 2.5 inches from their bottom edge to the bottom of the frame lip, then drill 3/8 inch holes.
The kit supplies one crossmember, two side brackets and a polyurethane trans mount.

Notes from the 1963-1972 2WD GM truck LS install guide.

1964-1972 C10 LS transmission mount FAQ

Will an 8L90E fit the floor of a 1964-1972 C10?

The 1963-1972 truck guide lists the 8L90E among late gearboxes that fit the factory tunnel without floor changes.

Which adapter suits a six-speed manual in my C10?

A CTS-V T-56 or standard TR-6060 uses the steel T-56 / TR-6060 adapter. An MG9 needs the MG9 adapter.

Do I drill the frame for the truck crossmember?

Yes. The guide has you place the outer brackets for your transmission and drill new 3/8 inch holes.

Is the 10L90E covered for 1964-1972 trucks?

The 8L90E adapter also fits the 10L90E tailshaft, but the truck guide does not mention the 10L90E.

1964 - 1972 2wd GM Truck LS Transmission Mount Adapters