GM TH700R4 Automatic Transmission

TH700R4 Transmission Ratios & Specs

The TH700R4, or simply 700R4 as most refer to it as, is a four speed overdrive automatic transmission developed by General Motors. It is commonly swapped in place of the TH350 in older GMC and Chevrolet pickups, as having an overdrive transmission provides significant improvements in fuel economy and the swap does not sacrifice any of the TH350's favorable characteristics.

The Turbo Hydra-Matic 700R4 transmission was introduced in 1982 as a replacement for the TH350. It features a 30% overdrive, which provided significant improvements in fuel economy over the three speed TH350, whose tallest gear was direct drive (1:1). Also beneficial, the 700R4 has a shorter 1st gear ratio (3.06 as opposed to 2.52). It's heavier than the TH350, weighing in the ballpark of 200 lbs including the torque converter. In 1990, GM renamed the transmission the 4L60 - "4" for four speed, "L" for longitudinal (mounted), and "60" to represent a nominal GVWR of 6,000 lbs. The transmission continued to appear in a variety of GM vehicles, including 1/2 ton GMC/Chevrolet pickups, until 2012.


700R4 Transmission Ratios






3.059 : 1

1.625 : 1

1.00 : 1

0.696 : 1

2.294 : 1


700R4 Transmission Specs


4 speed, overdrive automatic transmission


1982 - 2012, various GMC, Chevrolet, and Buick applications

Case Material:

Cast aluminum

Case Length:

23.375" overall

Input Spline:

27 spline from 1984, 30 spline from 1984 on


~ 200 lbs dry

Fluid Type*:

DEXRON VI, 8.8 - 11.4 quart capacity


GM 700R4 transmission pan bolt pattern

*Required fluid type and fluid capacity may vary with application and model year - refer to vehicle's owner manual.