LS/Gen III-IV engines use different crank pilot depth and flexplate/converter spacing than traditional SBC/BBC. These 4L85E packages are set up to bolt directly to LS engines with the correct converter engagement.
LS applications require the correct flexplate and converter setup. Our packages include a converter matched to LS spacing and stall needs. Multi-disc options are available for higher tiers.
Factory PCM/TCM can control the 4L85E in many LS trucks/cars. For swaps, we recommend a quality standalone controller (TCI, Holley, etc.). We provide baseline shift and lockup guidance; final tuning should match your build.
Yes—flush or replace the cooler and lines at install. Heat and contamination are the #1 killers of any build and can void warranty coverage.
Coverage is tiered per build and can be extended up to 6 years total with Extend. Abuse, overheating, or improper tuning are excluded.
*Horsepower ratings are guidance; weight, gearing, converter lockup strategy, and tune all affect results. When in doubt, step up a tier.
