T-15

If your J Truck has a 3 speed transmission, chances are that it is the T-15. This tranny is regarded by some as one of the all-time bullet proof gear boxes.

I don't know about all that, but it certainly is at least medium-duty, and second only to the T-18s in the J Series line of sticks.

  • It is identified by the casting number of T15 or 1307.
  • The input shaft measures 1 1/8" and has 10 splines.
  • The output shaft measures 1 3/8" and has 6 splines.

T-15 Gear Ratios

1ST 2ND 3RD REV
2.97 1.55 1.00
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