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GM Turbo 350 Transmissions: Find out how to Rebuild and Modify

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Though not fairly the heavy-duty performer as its large brother, the Turbo 400, the Turbo 350 transmission is a positive, sturdy, succesful, and when modified, stout performer in its personal proper. Tens of millions of GM vehicles and vans have been constructed with Turbo 350 computerized transmissions. There at all times comes a time when the outdated transmission reveals indicators of wear and tear. Sooner or later, even the most effective transmissions must be rebuilt.

In GM Turbo 350 Transmissions: Find out how to Rebuild & Modify, revered automotive technical writer Cliff Ruggles guides you thru the complicated rebuild process of GM’s well-liked rear-wheel-drive computerized transmission. Together with his confirmed model, Ruggles goes via the step-by-step rebuild and efficiency improve procedures in a collection of full-color images. He consists of instruction on elimination and set up, tear-down procedures, elements inspection and substitute, in addition to efficiency mods and shift package set up. Time-saving ideas are a part of each buildup as effectively.

Computerized transmissions are a thriller to most. Even when you find yourself deciding to have knowledgeable handle your transmission restore and efficiency wants, the knowledge contained on this e book is essential to understanding how the ability will get from the engine to the street. Add a replica of GM Turbo 350 Transmissions: Find out how to Rebuild & Modify to your automotive library at present.



From the Writer

Though the Turbo 350 isn’t fairly the stout heavy-duty performer that its large brother, the Turbo 400, is, the TH350 transmission is a positive, sturdy, succesful, and when modified, stable performer. Tens of millions of GM vehicles and vans have been constructed with Turbo 350 computerized transmissions. There at all times comes a time when the outdated transmission reveals indicators of wear and tear. Sooner or later, even the most effective transmissions want a rebuild.

Revered automotive technical writer Cliff Ruggles guides you thru the complicated rebuild process of GM’s well-liked rear-wheel-drive computerized transmission. Ruggles particulars the step-by-step rebuild and efficiency improve procedures. He consists of instruction on elimination and set up, tear-down procedures, elements inspection, and substitute, in addition to efficiency mods and shift package set up. Time-saving ideas are additionally a part of each buildup.

Instruments & Tools

A roll-around cart makes an excellent place to maintain your rebuild package and different elements clear and separated from the work space.

Elimination

Right here’s a typical drawback with some autos which have a rear-located distributor. If the engine isn’t successfully supported, it might probably lean again and break the distributor cap; in excessive instances it should bend or break the housing!

Disassembly

The used TH350 transmission is secured within the holding fixture and is mounted on the workbench. I’ve cleaned off a piece space and rounded up the instruments wanted to take the unit aside for inspection. This specific unit was fairly clear. Some items require energy washing to take away dust, mud, grease, and street grime earlier than they’re taken aside.

Transmission Fundamentals

The TH400 and TH350 transmissions use a gear-type oil pump. The inside gear is pushed immediately by the hub of the engine’s torque converter. Word that the inside gear is offset within the housing. This creates a chamber that strikes oil and forces it out of the pump.

Meeting

Verify the endplay on every pinion as proven. Additionally spin every pinion and wobble them forwards and backwards. If endplay is past .050 inch, if you happen to really feel any tight spots, or whether it is free on the pins, you need to substitute the planetary meeting.

Shift Equipment Set up

Take away the help plate after which take away the manufacturing facility separator plate. If the transmission is within the car, you can find 4 examine balls above the plate. They won’t be reused as a result of the TransGo shift package accommodates new examine balls.

Efficiency Mods

The aftermarket provides a hardened outer intermediate sprag race as an improve for the TH350 transmissions. It takes extra abuse than the inventory outer race, however can nonetheless fail in a high-torque utility whether it is used with the inventory curler clutch meeting. This occurs just because the load isn’t distributed evenly to the outer race as it’s with the a lot stronger 36-element aftermarket sprag meeting. The (aftermarket) hardened race on this picture survived 71 high-10-second dragstrip runs behind a high-torque 455-ci engine earlier than it exploded.

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