1968 Chevrolet C10 Transmission - Hauling Ass On The Highway

4. The governor is tweaked in house for better performance and to set the shift rpm; the base line is 5,500, but it can be set to the customer's needs.

5. The intermediate drum has a problem with the splines shearing off under higher power levels, so CPT hardens the drum with a special coil-induction heat treatment.

6. All of the steels in the transmission are replaced with high-performance plates. The high-performance frictions and steels are installed in alternating order, starting with a steel plate. CPT adds a total of four extra packs of frictions and steels.

7. Once the pump is mounted, which will hold everything in place, we can get moving to the valvebody.

8. The valvebody also gets recalibrated springs for more positive shifts. Shift firmness can be tailored to individual tastes.

9. When all of the springs, check balls, and rods are in place, the valvebody gets torqued down. Some other smaller pieces are installed before the pan is bolted on, completing the build.

1. Now to get that new trans in the truck, but first we have to get the broken TH400 out. We threw the truck up on a lift and removed the cooler lines, shift linkage, starter, speedo cable, and the torque converter bolts.

2. We hooked up the tranny jack and removed all the bellhousing bolts, before we unbolted the crossmember. In these trucks, the crossmember is usually hot-riveted to the frame, necessitating the use of a grinder or a torch to get them out. Luckily, someone has already done that on this truck, so all we needed to do was remove the hardware and slide it back with the persuasion of a hammer.

3. The trans came out without a hitch, but we did discover a little problem. The bellhousing on the TH400 was snapped off on the passenger side. This can be fixed with a little aluminum welding and some grinding work, but we are changing it out completely so it posed no issue for us.

1. Since there is no computer in the 200, the TV cable is how the trans knows what you are doing and one of the reasons this is a great candidate for classic trucks. The TV cable controls line pressure, shift points, shift feel, and part-throttle downshifts. To hook it up, we slid the end over the little tab coming out of the trans.

2. Then, we installed the provided bolt to hold the cable assembly in place. Take care sliding the cable in the hole, since it has a small O-ring to seal it; a little grease will help it go in properly.

3. We pre-filled the torque converter with the proper Dexron III fluid. This will keep a huge amount of air from flowing through the trans on initial start-up, much like pre-filling an oil filler when you do an oil change.