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ATSG 44400 1969-86 GM TH350C Transmission Repair MINI CD
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ATSG 44400 1969-86 GM TH350C Transmission Repair MINI CD



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GM TH350/350C 69 - 86 model years. an ATSG General Motors

TH350 / THM350C Transmission Tech Service Manual MINI CD

NOTICE:  If you require a printed manual, please visit part number HP511.

The THM 350 C and  TH350 transmission, first introduces in model year 1980, is a modified version of the previous THM 350 transmission, with the addition of a Torque Converter Clutch. The similarity of the THM 350C and the THM 350 are covered in this manual, along with some of the 350 updates.

We wish to thank General Motor Corporation for the illustrations and information that have made this booklet possible. The booklet covers the procedures necessary to diagnose, repair and/or overhaul the 350C transmission and the 350 transmission.

Information on the  350C automatic transmission:
THM350C and TH350 are a fully automatic unit consisting primarily of a 4-element hydraulic torque converter and two planetary gear sets. Four multiple-disc clutches, two roller clutches, and an intermediate overrun band provide the friction elements required to obtain the desired function of the two planetary gear sets.

A hydraulic system pressurized by a gear type pump provides the working pressure required to operate the friction elements and automatic controls.

External control connections to the transmission are

  1. Manual Linkage – To select the desired operating range. 
  2. Engine Vacuum – To operate the vacuum modulator. 
  3. Detent Cable – To operate the detent valve.

The ATSG THM350C and TH350 Transmission Repair Manual
or TH350 / THM350C Transmission Tech Service Manual
includes Trouble Diagnosis
The key to correcting any complaint is to make use of all the available symptoms and logically letting them direct you to the cause. Symptoms or conditions that will help are determined by subjective road test, oil pressure checks or noise evaluation.

When dealing with automatic transmission complaints, it is best to gather as many symptoms as possible before making the decision to remove the transmission from the vehicle.

Remember, the vehicle is the best test stand and diagnostic tool available to you, if the transmission is operable. Once the transmission is on the bench, it cannot tell you “what hurts” and quite frequently the correction of the cause of the complaint does not require removal of the transmission from the vehicle.
 

The ATSG THM350C and TH350 Transmission Repair Manual
or TH350 / THM350C Transmission Tech Service Manual includes the following:

  • THM350C and TH350 general description
  • THM350C and TH350 diagnosis
  • THM350C and TH350 teardown
  • THM350C and TH350 pump external parts exploded view and diagnosis
  • THM350C and TH350 valve body internal parts exploded view and diagnosis
  • THM350C and TH350 checkball locations exploded view and diagnosis
  • THM350C and TH350 case and external parts exploded view
  • THM350C and TH350 step by step disassembly
  • THM350C and TH350 step by step reassembly
  • THM350C and TH350 specifications
  • THM350C and TH350 Supplement information
  • THM350C and TH350 Tech bullentins
  • and much more