What does “Pre‑LS” mean here?

Pre‑LS refers to Gen I/II small‑ and big‑block Chevy engines (SBC/BBC) used before GM’s Gen III/IV LS platform. These use traditional crank pilot dimensions and a 168‑tooth flexplate. LS engines require a 4L85E Transmission.

Do I need a special controller?

Yes for swaps. The 4L80E is electronically controlled by a PCM/TCM. Use your factory PCM (if equipped) or a quality standalone controller. We provide baseline shift/lockup guidance; final calibration should match your gear, tire, and use case.

Is my converter included and matched?

Every package includes a matched lockup converter. Multi‑disc lockup options are available on Sport/Track builds.

What about PWM vs non‑PWM lockup years?

Early 4L80E (’91–’93) used on/off TCC; ’94+ added PWM strategy. We build to your year and calibration—just confirm your ECM/PCM or controller.

Any install must‑dos?

Replace/flush cooler & lines, verify flexplate/converter fasteners and spacing, set TV/line adapters if applicable for your controller, and complete PCM/controller calibration before road test.

Warranty details?

See tier notes above. Monster coverage up to 6 years total with Extend on transmissions. Abuse/mis‑calibration/overheat are excluded—call us if you’re adding power to pick the right tier.

*HP figures are guidance; weight, traction, gearing, aero, and tune all affect capacity.