Automatic Transmission Identification and Information

(Everything you wanted to know and keep asking!)

Gear Ratios of Popular GM Transmissions

Trans1st Gear2nd Gear3rd Gear4th GearReverse
Powerglide1.76/1.821.001.76/1.82
TH3502.521.521.001.94
TH4002.481.481.002.07
TH200-4R2.741.571.000.672.06
TH700-R43.061.621.000.702.29
4L80E2.431.491.000.752.07

Transmission Guidelines

Transmission Dimensions

Transmission Identification By Pan

1Aluminum Powerglide14 bolts
2TH200 Metric11 bolts
3TH35013 bolts
4TH40013 bolts
5TH200-4R16 bolts
6TH700-R4, 4L60, 4L60E16 bolts
74L80E17 bolts

Identifying a TH200-4R vs. TH200

Photo of TH200-4R transmission

The TH200-4R is identified by 10 bolt holes and 2 dowel-pin locator holes on the universal bellhousing.  It has a dual bolt pattern for both Chevrolet and BOP (Buick, Olds, Pontiac) applications.  The TH200 has only six bolt holes and 2 dowel-pin holes.

%d bloggers like this: