Johnson Lifters ST2356 - Drop-in Gen III Hemi Lifters with Axle Oiling

Description

Eliminate valvetrain instability and prevent common roller failures with the premium Johnson Lifters Gen III Hemi Drop-In Short Travel Lifter Set with Axle Oiling (Part # ST2356). Sourced and manufactured 100% in the USA, these precision hydraulic roller lifters are built to handle the rigorous demands of high-RPM, high-spring-pressure, and high-boost Chrysler/Dodge/RAM Gen III Hemi builds.

Featuring proprietary pressurized direct axle oiling, a short-travel internal plunger design, and a heat-treated cold-forged steel body, the ST2356 set delivers solid-roller-like valvetrain stability while retaining the quiet, low-maintenance operation of a hydraulic setup. Designed as a direct drop-in non-MDS replacement for factory plastic lifter guide yokes, they are the gold standard for Hellcat, Trackhawk, Scat Pack, and custom stroker valvetrain assemblies.

Core Technical Specifications

• Engine Platform: Gen III Hemi (5.7L, 6.1L, 6.2L Hellcat/Demon, 6.4L 392 Apache)
• Lifter Body Diameter: 0.842 in. (Standard OEM bore diameter)
• Lifter Design: Drop-in hydraulic roller (compatible with non-MDS OEM-style guide trays/yokes)
• Axle Oiling: High-pressure targeted direct axle oiling for continuous needle-bearing lubrication under extreme loads
• Internal Travel: Short travel plunger design (minimizes plunger travel to resist pump-up and valve float at high RPM)
• Body Construction: Cold-forged steel body, precision heat-treated for superior hardness and wear resistance
• Roller & Axle: Precision-ground needle roller bearings with high-chromium steel axle
• Valving: High-flow, fast-reacting disc check valve engineered for immediate recovery at extreme engine speeds
• Metering: Calibrated oil metering band to ensure proper rocker tip lubrication without dropping engine oil pressure
• Quantity: Complete engine set of 16 lifters

Crucial Installation & Fitment Notes

• Pushrod Length Check Required: Due to the relocated pushrod cup depth and short-travel plunger design, custom pushrod lengths are typically required. Always verify pushrod length with an adjustable length checker during final mock-up.
• Recommended Lifter Preload: Target .035 in. (+/- .005 in.) preload. When building with an aluminum engine block, consider the upper end of the preload window to compensate for thermal block expansion.
• MDS De-Activation: These lifters are strictly non-MDS. When replacing MDS-equipped lifters (5.7L/6.4L), factory MDS solenoids and PCM parameters must be physically deleted and electronically disabled.
• Lifter Trays: Requires standard non-MDS Gen III Hemi plastic lifter guide yokes/trays (Mopar Part # 53021721AA or equivalent).