Transmission identification
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==GM transmissions== | ==GM transmissions== | ||
==Automatic== | ==Automatic== | ||
| + | ===TH350=== | ||
| + | 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. | ||
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| + | ==TH350 transmission ID== | ||
| + | {| | ||
| + | |[[File:TH350 ID governor cover.jpg|frame|left|ID stamped into governor cover]] | ||
| + | |} | ||
| + | |||
| + | ===TH350 dimensions and tailshaft (extension housing) lengths=== | ||
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| + | [[File:TH350 dimensions.jpg|thumb|left|400px|]]<br style="clear:both"/> | ||
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| + | You will find the TH350 with 6", 9" and 12" tail housings. There is also a 4WD output (seen below). | ||
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| + | [[File:3504WD output.jpg]] | ||
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| + | ===What vehicles came with the TH350?=== | ||
| + | TH350 was used in some Y- and F-body cars in 1968, then across the board in 1969 to 1980. Then from 1981-’86 the TH350C was available. | ||
| + | |||
| + | *1969-'84 Buick, Chevrolet, Olds and Pontiac full-size cars | ||
| + | *1969-'81 Buick, Chevrolet, Olds and Pontiac A-body, G-body and F-body cars | ||
| + | *1973-'79 Buick, Chevrolet Olds and Pontiac X-body cars | ||
| + | *1969-'78 Riviera | ||
| + | *1975-'82 Corvette | ||
| + | *1975-'80 Buick, Chevrolet, Olds and Pontiac H-body cars (Vega, Monza, Skyhawk, etc.) | ||
| + | *1981-'82 Cadillac Fleetwood and Deville (uni-bell and TH350C versions) | ||
| + | *1973-'85 Chevy and GMC 2- and 4WD pickups, Blazers, G-10, G-20 Vans and Suburbans | ||
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| + | ==TH350C== | ||
| + | There was also a TH350'''C''' version that has a lockup torque converter (TCC). The case has a "C" cast into it, and there will be an electrical plug adjacent to the shifter shaft on the driver side of the tranny. Not to be confused with a TH350 non-lockup tranny with a screwed-in electrical connector on the ''passenger'' side of the case. This is a pressure switch that was used ~1972-'73 for the Transmission Controlled Spark (TCS) system. This disabled the distributor vacuum advance in all gears except high gear, and is a single wire switch threaded into a pressure port near where the cooler lines are located. In the case of this switch, you can either leave it in place, unused- or remove it and plug the port. There have been reports of some TH350 trannys having a temp sender in this area as well. | ||
| + | |||
| + | ==TH250C== | ||
| + | The TH250 looks almost identical to the TH350 externally- same size, same oil pan. Unlike the TH350, it has a band adjuster stud and lock nut on the passenger side of the case near the cooler lines. Be careful to not be fooled into thinking a TH250 is a TH350. | ||
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===General information=== | ===General information=== | ||
[[Image:Pan_id.jpg|frame|center|Transmission identification by pan shape with gear ratios.]] | [[Image:Pan_id.jpg|frame|center|Transmission identification by pan shape with gear ratios.]] | ||
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[[Image:Transmission_dimensions.jpg|Transmission dimensions.]] | [[Image:Transmission_dimensions.jpg|Transmission dimensions.]] | ||
| − | '''NOTE:''' An aluminum | + | '''NOTE:''' An aluminum Powerglide also exists with an 18" extension housing. |
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#The FMX (from 1967 to 1979). | #The FMX (from 1967 to 1979). | ||
| − | *Early Cruise-O- | + | *Early Cruise-O-Matics had a filler tube that attached to the transmission pan. |
*FMX transmissions filler tube slid into the main case. | *FMX transmissions filler tube slid into the main case. | ||
| − | The Cruise-O-Matic/FMX transmissions are easily identified by their design, which incorporates a cast-iron main case (unlike all other Ford three-speed automatic offerings) with separate aluminum bellhousings and extension housings bolted to it. The Cruise-O- | + | The Cruise-O-Matic/FMX transmissions are easily identified by their design, which incorporates a cast-iron main case (unlike all other Ford three-speed automatic offerings) with separate aluminum bellhousings and extension housings bolted to it. The Cruise-O-Matic should be avoided in performance applications as very little is available in the way of aftermarket performance parts other than shift kits. The Cruise-O-Matic were also offered with all three bolt-common V8-pattern bellhousings. |
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**Small block (302, 351W, etc): 5-1/8" top bolt centers | **Small block (302, 351W, etc): 5-1/8" top bolt centers | ||
*Case: Aluminum; 11 pan bolts; 1 adjusting screw; 1 servo; Modulator | *Case: Aluminum; 11 pan bolts; 1 adjusting screw; 1 servo; Modulator | ||
| − | *Extension housing ( | + | *Extension housing (2WD, Divorced 4x4): 6 bolts to case |
**Aluminum | **Aluminum | ||
***7": Bearing; 0, 1, or 2 threaded bosses; With or without speedometer hole | ***7": Bearing; 0, 1, or 2 threaded bosses; With or without speedometer hole | ||
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