The transmission in a 1998 Chevy 2500 4×4 is a 4L80E 4-speed automatic transmission. The 4L80E is a heavy-duty transmission that is designed to handle the torque and power of a large V8 engine. It is a relatively reliable transmission, but it is important to have it serviced regularly to prolong its lifespan.
If your 1998 Chevy 2500 4×4 has a manual transmission, it is most likely an NV4500 5-speed manual transmission. The NV4500 is a durable transmission that is well-suited for heavy-duty use.
To be sure which transmission is in your 1998 Chevy 2500 4×4, you can check the RPO codes on the driver’s side doorjamb. The RPO codes are a series of letters and numbers that indicate the specific features that your vehicle came with. The RPO code for the 4L80E transmission is M30. The RPO code for the NV4500 transmission is M5W.
If you are still unsure which transmission is in your vehicle, you can contact your local Chevrolet dealer or a qualified transmission specialist.