The Specs for a 200R4 Transmissionby A.J. Andrews
General Motors produced the 200-4R automatic transmission from 1980 to the early 1990's. The 200-R4 powered the 1983 Buick Regal Grand National, where it proved sturdy enough to handle performance ratings of 190 horsepower and 275 pound-feet of torque.
The 200-R4 has a first-gear ratio of 2.74:1, a second-gear ratio of 1.57:1 and a third-gear ratio of 1:1. It has a fourth-gear ratio of .67:1 and a reverse gear ratio of 2.07:1.
The 200-R4 has an overall length of 27 11/16 inches and a bell housing height of 19 1/8 inches. The distance from the center bearing cover retainer bolts to the rear of the transmission case measures 27 inches and the spacing between the retainer bolts equals 3 ¾ inches.
When paired with General Motors' engines that have full-size bell housings (with the exception of Chevrolet models), the 200-R4 provides a 30 to 40 percent increase in gas mileage over a three-year period. The 200-R4 uses a 12-volt feed to operate the torque converter's solenoid.
A.J. Andrews' work has appeared in Food and Wine, Fricote and "BBC Good Food." He lives in Europe where he bakes with wild yeast, milks goats for cheese and prepares for the Court of Master Sommeliers level II exam. Andrews received formal training at Le Cordon Bleu.