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1968 Chevrolet C10 Transmission - Hauling Ass On The Highway

1968 Chevrolet C10 Governor
4. The governor is tweaked... 
   
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1968 Chevrolet C10 Governor
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.
1968 Chevrolet C10 Intermediate Drum
5. The intermediate drum has... 
   
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1968 Chevrolet C10 Intermediate Drum
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.
1968 Chevrolet C10 High Performance Plates
6. All of the steels in the... 
   
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1968 Chevrolet C10 High Performance Plates
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.
1968 Chevrolet C10 Pump
7. Once the pump is mounted,... 
   
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1968 Chevrolet C10 Pump
7. Once the pump is mounted, which will hold everything in place, we can get moving to the valvebody.
1968 Chevrolet C10 Valvebody
8. The valvebody also gets... 
   
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1968 Chevrolet C10 Valvebody
8. The valvebody also gets recalibrated springs for more positive shifts. Shift firmness can be tailored to individual tastes.
1968 Chevrolet C10 Bolted Pan
9. When all of the springs,... 
   
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1968 Chevrolet C10 Bolted Pan
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.
1968 Chevrolet C10 Removing Lines
1. Now to get that new trans... 
   
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1968 Chevrolet C10 Removing Lines
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.
1968 Chevrolet C10 Tranny Jack
2. We hooked up the tranny... 
   
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1968 Chevrolet C10 Tranny Jack
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.
1968 Chevrolet C10 Bellhousing
3. The trans came out without... 
   
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1968 Chevrolet C10 Bellhousing
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.
1968 Chevrolet C10 Tv Cable
1. Since there is no computer... 
   
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1968 Chevrolet C10 Tv Cable
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.
1968 Chevrolet C10 Cable Assembly
2. Then, we installed the... 
   
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1968 Chevrolet C10 Cable Assembly
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.
1968 Chevrolet C10 Torque Converter
3. We pre-filled the torque... 
   
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1968 Chevrolet C10 Torque Converter
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.

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