That also converts into a lighter transmission that carries a weight of 120 pounds. The TH350 was also known for its quite short length, with an overall length of 21.75”. The transmission casing is made of cast aluminum. The Turbo 350 transmission was a single piece transmission with the bell housing integrated into the transmission body. The gear ratios used for this transmission were 2.52 for 1st gear, 1.52 for 2nd gear, and 1.0 for 3rd gear. This transmission is a 3 speed, and no overdrive gear was available. This is an automatic transmission that is longitudinally mounted, making it applicable for rear-wheel drive cars. The most torque from an engine that this transmission was applied to was 410 lb-ft. The transmission would be modified so that the transmissions behind the stronger engines were able to handle the additional torque. The maximum torque that this transmission could handle varied depending on the application to which it was being applied. One of the weaknesses noted about this transmission was wobble of the direct clutch drum. This transmission is also known for being strong and versatile, in addition to being quite compact. The simple fact that this transmission had an extra gear compared to its predecessor is an advantage from the start. The TH350 was popular for a variety of reasons. While the TH350 is no longer in production, the transmission is still used for many classic car builds. In addition, a TH350-C added the lockup torque converter capability and was introduced in 1979. This transmission was in production for about 15 years, being fully replaced by the 700R4 in 1984. While the phase-in began in 1969, it was not complete until the 1973 when the Powerglide fully phased out. The TH350 was introduced in 1969 as a replacement to the Powerglide 2 speed automatic transmission.
To name a few, this transmission was used in the Caprice, Chevelle, Corvette, Blazer, and Nova. The Turbo 350, known by the name TH350, was used in nearly all GM rear wheel drive car and truck applications during its tenure. This transmission replaced the GM Powerglide automatic transmission, which was a 2 speed automatic transmission that was in production for 23 years. Although they were both under the General Motors umbrella, at the time they acted as completely separate entities, whereas now the developers at General Motors powertrain work only for GM, not Chevrolet or Buick. This transmission was a 3 speed automatic transmission developed jointly by Chevrolet and Buick. This is the same ratio as a 4R70W transmission.The Turbo 350 transmission was introduced beginning in 1969. Low geared 1st with 11,72% less 1st to 2nd Splines (output shaft) Pan Bolts (number of) TypeĬhevrolet Transmission Ratios Transmission Ratiosħ00R4 / 4L60E with PATC close ratio gear set. This 7-3/8" long extension housing can eliminate transmission crossmember modifications when replacing a TH400 or TH200-4R transmission with a 4L60 assembly.ĤL60E (bellhousing pattern - Chevrolet/removable) StyleĤL60E / 4L65E (w/ removable bellhousing) All LS1 Type StyleĤL80E 1991-Later (bellhousing pattern - Chevrolet) StyleĦL80E 2006-Later (w/ removable bellhousing) StyleĦL90E 2006-Later (w/ removable bellhousing) Style * An extension housing p/n 8673406 (old p/n 24214689) is available for the TH700R4/4L60 transmission that moves the rear transmission mount to the same position as a TH400 (short-style 4" tail) or TH200-4R transmission. TH700-R4 /4L60 (bellhousing pattern - Chevrolet) Style TH200-4R (bellhousing pattern - BOP, Fit-all) Style TH400 (bellhousing pattern - Chevrolet, BOP) Style TH350 (bellhousing pattern - Chevrolet, BOP, Fit-all) Style Powerglide (bellhousing pattern - Chevrolet, Fit-all) Style this means that dimension "C" is usually longer than dimension "B". Note: The mounting pad is usually a part of the extension housing, but the graphic shows it on the maine case. Dimension "C" is the distance from the bellhousing to the center of the transmission mounting pad.