Respected automotive technical author Cliff Ruggles takes readers through the complex rebuild procedure of GMs TH-400 transmission in this great new book. Enthusiasts have embraced the reliable GM Turbo Hydra-Matic 400 three-speed automatics for years, and the popularity of these transmissions is not slowing down. With his proven style, Ruggles walks through the step-by-step rebuild and performance upgrade procedures in a series of full-color photos. Time saving tips are part of every buildup.

This is a welcome addition to your automotive library. Amateurs and professionals alike will appreciate the advice and guidance offered on every page. The book is full of information crucial to understanding how the power gets from the engine to the road.

Once the cover was removed I could see 3 circuit boards i.e; the power board, the mainboard and the inverter boards-see the photo below:

The first board to check was the power supply board. However, the  fuse and other major components were checked to be in good condition. I powered up the power supply and check on the output voltages in the mainboard and inverter connectors. It reads zero volt, so this means either the power supply itself has problem or something shorted in the mainboard or inverter board that causes zero volt.

So this means the inverter board was shorted causing the power supply not to work. I set my mutlitmeter to diode scale measure between the 12 v dc supply pin and the cold ground pin and the result was shorted-see the photo below:

Respected automotive technical author Cliff Ruggles takes readers through the complex rebuild procedure of GMs TH-400 transmission in this great new book. Enthusiasts have embraced the reliable GM Turbo Hydra-Matic 400 three-speed automatics for years, and the popularity of these transmissions is not slowing down. With his proven style, Ruggles walks through the step-by-step rebuild and performance upgrade procedures in a series of full-color photos. Time saving tips are part of every buildup.

This is a welcome addition to your automotive library. Amateurs and professionals alike will appreciate the advice and guidance offered on every page. The book is full of information crucial to understanding how the power gets from the engine to the road.

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Posted by 2018 article

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