(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
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.