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The Borg-Warner T-15 is a 3 speed transmission with a cast iron case with a casting number of T15 or 1307. The casting numbers on the T-15 are on the passenger side near the top back. It has a 1 1/8" 10 spline input shaft. The T-15 has a 1 3/8" 6 spline output shaft. It has a reputation as the strongest of the 3 speeds.

 

Usage

The T-15 was used both in V8 and I6 full-size Jeeps (FSJs - trucks, Wagoneers and Cherokees) and in V8 equipped CJs and Commandos. In FSJs, the T-15 was the standard transmission behind the 350 Buick, AMC 258, and AMC 360 from 1969 to 1979. Some Wagoneers came with a column shift 3-speed as late as 1972; according to the 1972 Jeep factory service manual, these are T-15s. In the CJs and Commandos, the 72-75 304 V8 came only with the T-15, and was replaced by the Tremac T-150 in 1976.

While the variants of the T-15 share the same internal gears, the overall length of the transmission varied with application. This allowed for transmission positioning according to the distance between the driver and the back of the engine. The change in length was accomplished by using a specific input shaft and either a matching bellhousing, or a standard bellhousing with a large aluminum spacer between the bellhousing and the transmssion case. Later AMC vehicles had T-15s with one of three lengths of input shafts; short (CJs and Commandos), middle (FSJs with the 258 I6) and long (FSJs with the 360 V8).

 

Transmission	1st	2nd	3rd	4th	5th	Rev
T-15	3.00	1.83	1.00			3.00

 

Photos

Drivers side view of T-15 transmission.

Back view of T-15 transmission.

Front view of T-15 transmission.

Passenger side view of T-15 transmission. The casting numbers on the T-15 are on the passenger side near the top back.

Top view of T-15 transmission.

T-15 and T-90 transmission. Here's a top view of a T-90 and a T-15. The T-90 has an adapter on the front for the Dauntless V6, the adapter was probably originally on a T-86. The front of each transmission is even to show how much longer the T-15 is compared to the T-90.