Automatic Transmission
Identification and Information
(Everything you wanted to know and keep asking!)

 

 

Gear Ratios of Popular GM Transmissions

Trans 1st Gear 2nd Gear 3rd Gear 4th Gear Reverse
Powerglide 1.76/1.82 1.00 --- --- 1.76/1.82
TH350 2.52 1.52 1.00 --- 1.94
TH400 2.48 1.48 1.00 --- 2.07
TH200-4R 2.74 1.57 1.00 0.67 2.06
TH700-R4 3.06 1.62 1.00 0.70 2.29
4L80E 2.43 1.49 1.00 0.75 2.07

 


Transmission Guidelines

 


 

Transmission Dimensions

 


 

Transmission Identification By Pan

1 Aluminum Powerglide 14 bolts
2 TH200 Metric 11 bolts
3 TH350 13 bolts
4 TH400 13 bolts
5 TH200-4R 16 bolts
6 TH700-R4, 4L60, 4L60E 16 bolts
7 4L80E 17 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.

 

Information from November 2002 Car Craft Magazine