G-Body LS Trans Mount Adapters, 1978-1988

Transmission mount adapters for 1978-1988 G-Body LS swaps: Monte Carlo, Cutlass, Regal, Grand Prix, Malibu, El Camino and Caballero. Two suit TR-6060 manuals and two suit the 6L90E, 8L90E and 10L90E, giving each gearbox a traditional mount pad at the tail.

4 adapters for late model GM gearboxes
G-Body crossmembers differ by transmission
No tunnel work for automatics per the guide

The 1978-1988 G-Body LS install guide explains the full, split and short shelf frames your crossmember brackets bolt to. Engine mounts, headers and tanks are on the G-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

G-Body LS transmission mount adapter parts

Manual adapters: TR-6060 and MG9

Automatic adapters: 6L90E, 8L90E, 10L90E

Adapter details

CTS-V T-56 and standard Camaro TR-6060 adapter, with hardware.
Made from 3/16 inch steel and powder coated black.
MG9 adapter: for the TR-6060 behind the LSA in a CTS-V.
Automatic adapters made to work with BRP crossmembers.

1978-1988 G-Body transmission notes

Tell BRP your year, make, model and transmission when ordering. The guide names T-56, 4L60E and 4L65E crossmembers as different parts.
Automatics need no transmission tunnel changes. A T-56 needs a new shifter hole.
Body, body mount and frame variation can still mean clearancing the tunnel or firewall on some cars.
On a short shelf frame, drill the frame for the extra crossmember bracket.
BRP G-Body headers fit with the T-56, 4L60E, 4L65E, 6L80 and 6L90.
The kit does not work with the factory clutch Z-bar, and driveshaft length changes from stock.

Notes from the 1978-1988 G-Body LS install guide.

G-Body LS transmission mount adapter FAQ

Which G-Body crossmember goes with my transmission?

The G-Body guide says to give BRP your transmission when ordering, because the T-56, 4L60E and 4L65E crossmembers are different. It does not list a G-Body crossmember for the 6L90E, 8L90E or TR-6060.

Does a G-Body need tunnel work for an LS automatic?

Not according to the guide. Automatics fit without tunnel changes, while a T-56 needs a new shifter hole cut.

Will BRP G-Body headers clear a 6L90?

Yes. The guide lists the T-56, 4L60E, 4L65E, 6L80 and 6L90 as transmissions the G-Body headers fit with.

Can I keep the factory clutch linkage with a manual?

No. The guide says the kit will not work with the factory clutch Z-bar.