General Motors transmissions
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the TH350 trans was built in 5 different lengths. Two were 4x4 applications. Tail housing lengths of the two wheel drive were 6 inch, 9 inch and 12 inches. The 12 inch length is not very common. It was used mostly in Buick AND Oldsmobile station wagons. | the TH350 trans was built in 5 different lengths. Two were 4x4 applications. Tail housing lengths of the two wheel drive were 6 inch, 9 inch and 12 inches. The 12 inch length is not very common. It was used mostly in Buick AND Oldsmobile station wagons. | ||
| − | ===TH350 model ID codes=== | + | ====TH350 model ID codes==== |
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|[[File:1972 th350 id.jpg|thumb|200px|TH350 accumulator with ID. "72" is year, "152" is a calibration code, "KE" is application code (link to application codes below)]] | |[[File:1972 th350 id.jpg|thumb|200px|TH350 accumulator with ID. "72" is year, "152" is a calibration code, "KE" is application code (link to application codes below)]] | ||
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Codes for 1969-'72 TH350 transmissions are located on the accumulator; 1973-'81 TH350 codes are on the governor cover. Listings of the transmission application codes can be seen '''[http://www.teufert.net/trans/trans.htm HERE]'''. | Codes for 1969-'72 TH350 transmissions are located on the accumulator; 1973-'81 TH350 codes are on the governor cover. Listings of the transmission application codes can be seen '''[http://www.teufert.net/trans/trans.htm HERE]'''. | ||
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| + | ====TH350 ratios==== | ||
| + | *First: 2.52:1 | ||
| + | *Second: 1.52:1 | ||
| + | *High: 1:1 | ||
===TH400 (3L80), TH375C, TH475 (3L80HD)=== | ===TH400 (3L80), TH375C, TH475 (3L80HD)=== | ||
1987-up 3L80HD is the heavy duty version of the TH400 found in light trucks. It has a 27 spline output shaft and is 34.5" long overall in the 2WD version. 'HD' is cast into the bellhousing in medium size letters. The TH400 transmission was used between 1964-1990. 1987 was the year GM transmissions began using the alphanumeric designations. | 1987-up 3L80HD is the heavy duty version of the TH400 found in light trucks. It has a 27 spline output shaft and is 34.5" long overall in the 2WD version. 'HD' is cast into the bellhousing in medium size letters. The TH400 transmission was used between 1964-1990. 1987 was the year GM transmissions began using the alphanumeric designations. | ||
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| + | ====TH400 ratios==== | ||
| + | *First: 2.48:1 | ||
| + | *Second: 1.48:1 | ||
| + | *High: 1:1 | ||
===Switch Pitch=== | ===Switch Pitch=== | ||
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