C4 C-beam Reinforcement Plates

To install the DK-200 plates, you’ll need to lift your Corvette in the air via jack stands or lift.

Remove exhaust if it interferes with the clearance of removing the bolts. Support the transmission with a trans or floor jack before removing bolts.

Remove the M12 course thread factory bolts using an open wrench above the transmission and a socket on the bottom side. Should be an 18mm wrench and socket.

Some models, seems to be only manual transmissions, need to slightly open the hole from 12mm to 1/2″ for the provided hardware. Automatics seem to have a larger hole or have wallowed out over time. You’ll need a 1/2″ drill bit 7″ long.

Install both 1/2″ fine thread 7″ bolts through the two hole plate with the smaller holes sliding them through the C-beam on through the tail shaft.

Before seating the bolts all the way up, place the top plate with stover nuts welded in on top of the c-beam.

You may need to use a rubber mallet to encourage them to seat all the way in. And start the bolts by hand or wrench.

Tighten up the two bolts alternating back and forth tighten each one a little at a time to ensure it seats properly. Torque to 80 ft lbs.

Leaving the jack under the transmission holding the c-beam in place, loosen the differential bolts and remove.

You may have to pry the c-beam and differential to line up the holes for the provided 9/16″ x 8″ grade 8 bolts. These holes will not need to be drilled out.

Place the bolts through the two hole flat plate and place up through the c-beam and through the differential. Bolts shown here compared to factory course thread metric bolts.

Place the top plate with welded nuts on top and start the bolts by hand or wrench.

When tighten bolts, we suggest tighten up a little at a time alternating bolts until snug. Torque the fine thread bolts to 110 ft lbs.

If all other components are in fair shape, your car should track nice and straight during hard acceleration. This kit should reduce side kick when launch the car hard.