How Do You Rebuild A Truck Transmission?
Transmission Rebuilding can be done three ways: “Bench building” where you take your unit out of your truck and haul that to a service shop, or overhauled in your own shop if you have mechanical expertise, service literature and tools, or by leaving your “whole baby” at the Transmission Shop. (Sigh.) Automatic transmissions are operated by compartmentalized fluid, which is sent through first a filter from the pickup tube in the reservoir, then to various shift valves in the valve body, then onward through the gear assemblies and governors to lubricate and cool the moving parts. For the purpose of this article we will use one of the most frequently used truck transmissions, the THM 700R4: Fully automatic and using a three element hydraulic torque converter with its own clutch, the 700r4 uses five multi-disc clutches, one roller clutch, a sprag and an apply band to operate its compound planetary gearset. These provide four forward speeds and one reverse. We will consider the torque conve
