1998 - 4T60E
| Model Code | Motor and Platform | Differential Ratio | Sprocket Ratio | Final Drive Ratio | VSS Reluctor | Stall Speed |
| 8AHW | *3.29 | 35/35 | 3.29 | 30 | ||
| 8BSW | 3100 N-Body | *3.29 | 37/33 | 2.93 | 30 | 1630 |
| 8CUW | 2.4L | *3.05 | 33/37 | 3.42 | 30 | |
| 8DKW | *3.29 | 35/35 | 3.29 | 30 |
1998 - 4T65E
| Model Code | Engine | Platform | Differential Ratio | Sprocket Ratio | Final Drive Ratio | Converter Code | Converter Diameter | K-Factor (Stall) | IMS |
| 8FCB | 3800SC V6 | Buick Riviera, Park Avenue/Ultra | 3.29 | 37/33 | 2.93 | JSFM | 258mm | 133 | No |
| 8FDB | 3800SC V6 | Olds 88, Pontiac Bonneville | 3.29 | 37/33 | 2.93 | JSFM | 258mm | 133 | No |
| 8FFB | 3800 V6 | Buick Park Avenue/Ultra | 3.05 | 35/35 | 3.05 | JSFM | 258mm | 133 | No |
| 8KAB | 3800 V6 | Chevrolet Police/Taxi | 3.29 | 35/35 | 3.29 | FLHB | 245mm | 163 | No |
| 8THB | 3800 V6 | Chevrolet Lumina/Monte Carlo, Pontiac GP | 3.29 | 35/35 | 3.29 | FLHB | 245mm | 163 | No |
| 8TNB | 3800 V6 | Buick Regal/Century | 3.05 | 35/35 | 3.05 | FLHB | 245mm | 163 | No |
| 8TPB | 3800 V6 | Buick LeSabre, Olds 88, Pontiac Bonneville | 3.05 | 35/35 | 3.05 | FLHB | 245mm | 163 | No |
| 8XAB | 3800SC V6 | Buick Regal, Pontiac Grand Prix | 3.29 | 37/33 | 2.93 | JTFM | 258mm | 155 | No |
| 8YCB | 3.5L DOHC | Olds Intrigue | 3.29 | 35/35 | 3.29 | JXFM | 258mm | 164 | No |
| 8YFB | 3800 V6 | Buick LeSabre, Olds 88, Pontiac Bonneville | 2.86 | 35/35 | 2.86 | JSFM | 258mm | 133 | No |