Automatic Transmission Info
 

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

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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

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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