Transmission (Dual Range C6) Rollerization and Build up - Tear Down Part III

This year C6 has a vent tube, remove it.

Remove the servo from the case.

Remove the parking rod guide plate.

As well as the parking pawl and spring.

Very carefully use a punch to drive this pivot shaft down and this will push out the welch plug holding it in.

You can reuse the plug if it comes out without damage.

Use a 1/4" x 20 bolt and screw into the bottom of the pin and pull it out.

What's left inside is the Low-Reverse Clutch piston, springs, retainer, snap ring and sprag race.

You can use a spring compressor to remove the snap ring, retainer and springs, or if your careful and slowly remove the race bolts evenly you can relieve the spring tension off the piston and remove all the bits easier.

like so.

Remove the plate and springs.

The piston probably will not come out by hand so apply compressed air LIGHTLY to the port and the other hand over the piston. The last thing you want is to launch the piston clear out of the case.

Remove the piston, notice the large area behind the piston it doesn't take much air pressure to develop a large force behind the piston so be careful.

Remove the line and modulator port plugs.

Remove the manual shaft seal. Use a blunt screwdriver if you do not feel comfortable in controlling it to avoid scratching the aluminum case.

With the exception of the rear bushings the case is now pretty much empty and can be cleaned.

It'll be important to have a large clean area for all the parts.

Right, so that's the disassembly of the case. I'll cover the clutch packs, pump, valve body in the assembly portion. It's tidy to do each in sections.

The next posting will be on modification of the 1966 C6 Dual Range transmission.

Note 1 : Regarding the park-neutral start-backup lamp switch. It appears to be correct for that year and model. We have four 1966 galaxies, and the ones with column shift and an FX transmission have the switch mounted onto the the steering column under the dash. The LTD is column shifted with a C6 but has no provision to mount such a switch to the column. Odd they would make two style columns, but I guess they did compared to the other '66 gals. The C4 and C6 utilize the same switch.

Note 2: The C6 is just a bigger version of the C4 with the main difference being an integrated rear clutch into the case verses the rear band in the C4. The clutch has more holding power than a band.