Circlematic™ Transmission Applications

TCI® offers competition transmissions for oval track and marine performance applications. Several different options and speciality combinations are available for the Powerglide as well as the TH-350. Standard length transmissions weigh approximately 97 pounds and the rotating assemblies weigh 24.25 pounds in standard trim to less than 20 pounds in lightweight trim.

Our Direct Drive Powerglides eliminate the need for all external control of the line pressure when using a straight pump drive. This design allows you to operate the transmission by simply placing it into gear and easing down on the accelerator. Our TH-350 transmissions provide full engine braking and the the transmisison/converter combonations give you 100% fluid coupling. All transmissions feature high performance clutches, bands, a steel clutch hub (where applicable) and the Powerglides have a modified planetary gear set that will work with the latest rear suspensions.

Part No.	Transmission	Length	Low Gear Ratio	Valve Body	Drum & Hub	Oil Pan	Additional Information
7420101	Powerglide	279/16	1.82:1	Manual shift REV Pattern clutch less style 744500	steel drum, steel hub	528300 aluminum, std capacity	Clutch less style. Most popular style, recommended for all classes, easiest Circlematic to operate
742011	Powerglide	279/16	1.82:1	Manual shift FWD Pattern internal valve 744300	steel drum, steel hub	528300 aluminum, std capacity	Recommended for all classes, can be raced in low or high gear, shift on the fly
742012	Powerglide	279/16	1.82:1	Manual shift FWD Pattern internal valve 744300	steel drum	528300 aluminum, std capacity	Low gear only (no high gear), great for short track hobby cars with stock rear end gear rules
742013	Powerglide	279/16	1.82:1	Manual shift FWD Pattern internal valve 744300	Steel drum, steel hub	528321 “Kickout” steel pan for asphalt only	For asphalt track racers, kick-out pan prevents fluid starvation in corners
742014	Powerglide	279/16	1.82:1	Manual shift FWD Pattern internal valve 744300	Aluminum drum and  hub	528321 “Kickout” steel pan for asphalt only	Super lightweight version for asphault racers, lightweight planetary & gun drilled output shaft, with billet input shaft
742015	Powerglide	279/16	1.82:1	Manual shift FWD Pattern internal valve 744300	steel drum, steel hub	528300 aluminum, std capacity	Same as 742011 but with the shift lever pointing up for extra clearance in transmission tunnel area
742016	Powerglide	279/16	1.76:1	Manual shift FWD Pattern internal valve 744300	Steel drum, steel hub	528321 “Kickout” steel pan for asphalt only	For asphalt track racers, kick-out pan prevents fluid starvation in corners.  Has a 1.76:1 lo gear
7420171	Powerglide	279/16	1.82:1	Manual shift REV Pattern clutch less style 744500	steel drum, steel hub	528321 “Kickout” steel pan for asphalt only	Clutch less style. Most popular style, recommended for all classes, easiest Circlematic to operate. Asphalt only version
742018	Powerglide	279/16	1.82:1	Manual Shift FWD Pattern For working converter 744200	steel drum, steel hub	528300 aluminum, std capacity	Full manual design can be raced in Lo or Hi gear.  Use with FastLap Converter
742019	Powerglide	279/16	1.82:1	Manual Shift FWD Pattern for working Converter 744200	steel drum, steel hub	528321 “Kickout” steel pan for asphalt only	Full manual design can be raced in Lo or Hi gear.  Use with FastLap converter.  For asphalt use only.
7420202	Powerglide	279/16	1.82:1	Manual Shift REV Pattern Lo gear Only, clutchless style 744600	steel drum, steel hub	528300 aluminum, std capicity	Clutchless style, Lo Gear Only.  Easiest Circlematic to operate
7420212	Powerglide	279/16	1.82:1	Manual Shift REV Pattern Lo gear Only, clutchless style 744600	steel drum, steel hub	528321 “Kickout” steel pan for asphalt only	Clutch less style, Lo Gear Only.  Easiest Circlematic to operate.  For asphalt use only.
312020	TH-350 w/converter	279/16	2.52:1	Manual shift standard pattern 3 Speed	steel drums & hubs	std. steel	100% fluid coupling for maximum engine braking and instant throttle response coming out of turns
312021	TH-350 w/converter	279/16	2.52:1	Manual Shift standard pattern 2-speed	Steel drum & hubs	std. steel	100% fluid coupling for maximum engine braking and instant throttle response coming out of turns

* Suitable only in oval track and marine applications.