Part 3 Rebuilding the Transmission Main Case: Installing the Rear Drum and Reverse/Low Band & Linkage

Now I'm ready to install the drum that the rear band goes around and grabs, the rear band, and its associated linkage that's engaged by the rear servo piston.

First, I'll start by taking a look at the rear band. The old one's on the left. The new one on the right. Not much difference really aside from number of grooves. This band is a rigid style.



Here's the rear band and it's lower linkage.



And how they engage. The larger radius edge goes towards the drum.



Now I set the new rear band in some clean ATF to soak for a spell.



Now take the rear drum and spread some assembly lube on its mating surfaces. The outer surface is the race for the overrunning clutch already installed in the case. The inner surface rides on the overdrive piston retainer already installed.



Spread some assembly lube on the surface of the overdrive piston retainer.



Now slide the rear band in along with its lower linkage piece. Note the holes in the linkage need to line up with the hole in the case that the pivot shaft will come through.



Now slide the rear drum in the case and inside the rear band. Make sure you don't disturb any of the rollers on the overrunning clutch. Once you've got the drum onto the hub of the piston retainer it should slide on and into the overrunning clutch fairly easily.



Here's the rear drum in place inside the reverse/low band.



Install the associated snap ring that holds the rear drum on to the overdrive piston retainer.



Make sure it's seated fully in it groove.



Now I'm ready to complete the band linkage/lever assembly. Remove the two o-rings from the pivot shaft.



Install two new o-rings and spread on some assembly lube.



Push the pivot shaft in its hole at the rear of the case just enough to engage the first hole of the band linkage.



Insert the servo/band lever and push the shaft in further. Just enough to engage the first side of the lever.



Now install the inner most part of the lever/linkage system. It's impossible to show here, but there's a flat piece of steel that goes between the upper tang on the band and the linkage.



Push the pivot shaft all the way in its hole, fully bottoming it. Here you can see the end at the end of the hole's bore. The shaft is held in place by the overdrive assembly.



Now I poured a little ATF into the bore of the rear piston just for good measure. Figured it couldn't hurt.



Next: installing the front/intermediate servo piston, lever, and band.