TH350 rebuild tech
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The GM Turbo Hydra-Matic 350 transmission (aka "T350", "TH350", "T-350", "Turbo 350", etc.) was used between 1968-'86 in RWD and 4WD GM vehicles. It is a relatively rugged, compact transmission that lends itself to a wide variety of applications and modifications. | The GM Turbo Hydra-Matic 350 transmission (aka "T350", "TH350", "T-350", "Turbo 350", etc.) was used between 1968-'86 in RWD and 4WD GM vehicles. It is a relatively rugged, compact transmission that lends itself to a wide variety of applications and modifications. | ||
| − | == | + | ==Basic rebuild information== |
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|[[File:TH 350 backXL diagram.jpg|thumb|300px|center|Exploded view, "back" of the TH350 transmission.]] | |[[File:TH 350 backXL diagram.jpg|thumb|300px|center|Exploded view, "back" of the TH350 transmission.]] | ||
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[http://www.nastyz28.com/forum/showthread.php?t=53671 Original article by Jakeshoe] | [http://www.nastyz28.com/forum/showthread.php?t=53671 Original article by Jakeshoe] | ||
[[File:Sessions- ATSG-Haynes manuals.jpg|thumb|600px|left|Left to right: [http://www.amazon.com/Turbo-Hydra-Matic-350-Handbook-Sessions/dp/0895860511 Turbo Hydra-Matic 350 Handbook] by Ron Sessions; [http://www.northernautoparts.com/ProductModelDetail.cfm?ProductModelId=786 ATSG manual] p/n 44400; Haynes [http://www.amazon.com/gp/product/1563924234/ref=pd_lpo_k2_dp_sr_1?pf_rd_p=486539851&pf_rd_s=lpo-top-stripe-1&pf_rd_t=201&pf_rd_i=0895860511&pf_rd_m=ATVPDKIKX0DER&pf_rd_r=0J4A1QHT1Y8B032P3Z6P GM Automatic Transmission Overhaul] manual, p/n 10360.]]<br style="clear:both"/> | [[File:Sessions- ATSG-Haynes manuals.jpg|thumb|600px|left|Left to right: [http://www.amazon.com/Turbo-Hydra-Matic-350-Handbook-Sessions/dp/0895860511 Turbo Hydra-Matic 350 Handbook] by Ron Sessions; [http://www.northernautoparts.com/ProductModelDetail.cfm?ProductModelId=786 ATSG manual] p/n 44400; Haynes [http://www.amazon.com/gp/product/1563924234/ref=pd_lpo_k2_dp_sr_1?pf_rd_p=486539851&pf_rd_s=lpo-top-stripe-1&pf_rd_t=201&pf_rd_i=0895860511&pf_rd_m=ATVPDKIKX0DER&pf_rd_r=0J4A1QHT1Y8B032P3Z6P GM Automatic Transmission Overhaul] manual, p/n 10360.]]<br style="clear:both"/> | ||
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[[File:B&M Governor recalibration kit.jpg|thumb|300px|left|B&M Governor recalibration kit.]] <br style="clear:both"/> | [[File:B&M Governor recalibration kit.jpg|thumb|300px|left|B&M Governor recalibration kit.]] <br style="clear:both"/> | ||
| + | ==Rebuilding the T-350== | ||
| − | = | + | ===Case prep=== |
| − | ==Case prep== | + | |
Once the case has been cleaned, all threads checked and/or repaired, and the rear case bushing installed you can start assembly. | Once the case has been cleaned, all threads checked and/or repaired, and the rear case bushing installed you can start assembly. | ||
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[[file:T-350_acumilator02.jpg|frame|none|Pressure ports circled.]] | [[file:T-350_acumilator02.jpg|frame|none|Pressure ports circled.]] | ||
| − | ===Low-reverse piston install | + | =Transmission reassembly= |
| + | ==Low-reverse piston install== | ||
The first item to go in the case will be the low/reverse apply piston. | The first item to go in the case will be the low/reverse apply piston. | ||
Its function is for oil to force it towards the front or bell housing side of the trans, applying the low/reverse clutches. This allows reverse when applied simultaneously with the direct (high gear) clutches, and allows manual low gear when applied with the forward clutches. Manual low gear creates engine braking on deceleration. The low/reverse clutches do not apply in automatic range 1st gear. The low sprag (low roller clutch actually) causes first gear when only the forward clutches are applied. | Its function is for oil to force it towards the front or bell housing side of the trans, applying the low/reverse clutches. This allows reverse when applied simultaneously with the direct (high gear) clutches, and allows manual low gear when applied with the forward clutches. Manual low gear creates engine braking on deceleration. The low/reverse clutches do not apply in automatic range 1st gear. The low sprag (low roller clutch actually) causes first gear when only the forward clutches are applied. | ||
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