For 1988, the fourth-generation Chevrolet and GMC C/K was introduced, including (1500) 1⁄2 ton, (2500) 3⁄4 ton, and (3500) 1 ton pickup trucks.
Here you will find specifications and information for 1988 model year Chevrolet and GMC full-size trucks.
This includes engine ratings, drivetrain specs, and chassis dimensions.
Looking for GM official tow ratings? Tow Ratings
Engines
| RPO | Engine | Power(hp) | Torque(ft-lb) | Notes |
|---|---|---|---|---|
| LB4 | 4.3L (262ci) V6 | 160 @ 4000 | 235 @ 2400 | Below 8600 GVWR |
| LB4 | 4.3L (262ci) V6 | 160 @ 4000 | 235 @ 2400 | 8600+ GVWR |
| L03 | 5.0L (305ci) V8 | 175 @ 4000 | 270 @ 2400 | |
| L05 | 5.7L (350ci) V8 | 210 @ 4000 | 300 @ 2800 | Below 8600 GVWR |
| L05 | 5.7L (350ci) V8 | 185 @ 4000 | 295 @ 2800 | 8600+ GVWR |
| L19 | 7.4L (454ci) V8 | 230 @ 3600 | 385 @ 1600 | |
| LH6 | 6.2L (379ci) V8 Diesel | 126 @ 3600 | 240 @ 2000 | Below 8600 GVWR Manual Transmission |
| LH6 | 6.2L (379ci) V8 Diesel | 140 @ 3600 | 247 @ 2000 | Below 8600 GVWR Auto Transmission |
| LL4 | 6.2L (379ci) V8 Diesel | 143 @ 3600 | 257 @ 2000 | 8600+ GVWR |
Manual Transmissions
| Model | 4-SPEED SM465 | 5-SPEED W/OVERDRIVE |
|---|---|---|
| RPO | MM4 | MM5 |
| Synchronized Speeds | 2/3/4 | 1/2/3/4/5 |
| First | 6.55 | 4.02 |
| Second | 3.58 | 2.32 |
| Third | 1.70 | 1.40 |
| Fourth | 1.00 | 1.00 |
| Fifth | – | 0.73 |
| Reverse | 6.09 | 3.74 |
Automatic Transmissions
| Model | 3-SPEED TH400 | 4-SPEED w/OVERDRIVE 700R4 |
|---|---|---|
| RPO | MX1 | MX0 |
| First | 2.48 | 3.06 |
| Second | 1.48 | 1.63 |
| Third | 1.00 | 1.00 |
| Fourth | – | 0.70 |
| Reverse | 2.08 | 2.29 |
