Mopar Masters

Jeep Wrangler 8HP75 Swap
This Hellcat-powered Wrangler just got even meaner. We upgraded it with the legendary 8HP75 8-speed automatic transmission, delivering lightning-fast shifts, improved drivability, and better power delivery throughout the entire RPM range.
The result? Harder launches, smoother cruising, lower cruising RPM, and a transmission capable of handling serious horsepower while keeping the Hellcat's power right where it belongs—on the ground.
From custom integration to final calibration, this swap transforms the driving experience and takes this Wrangler to the next level.
More gears. More control. More performance.
Mopar Masters — Factory experience, custom solutions, and performance without compromise. 💪🔥🚙

Vehicle presented with complaints of reduced power, frequent regeneration events, and elevated exhaust backpressure. Diagnostic testing revealed the Diesel Particulate Filter (DPF) was severely face-plugged with soot and heavily contaminated with ash deposits, restricting exhaust flow through the filter substrate. Differential pressure readings across the DPF were significantly above specification, confirming excessive restriction within the aftertreatment system.
Further diagnosis identified a leaking EGR cooler as the root cause of the failure. Coolant entering the exhaust stream through the failed EGR cooler introduced contaminants into the aftertreatment system, accelerating ash accumulation and contributing to severe face plugging of the DPF. The resulting restriction prevented effective regeneration, increased exhaust backpressure, reduced engine performance, and placed additional stress on the turbocharger and exhaust aftertreatment components.
Corrective action includes replacement of the failed EGR cooler, replacement of the DPF assembly, inspection of related aftertreatment components for coolant contamination, and verification of proper EGR and exhaust system operation. Following repairs, all applicable aftertreatment adaptations and learned values should be reset, and the vehicle should be road-tested to confirm normal exhaust backpressure, regeneration performance, and overall engine operation.

Inspection revealed engine damage consistent with the use of an oil viscosity not meeting manufacturer specifications. Modern engines are engineered with precise lubrication requirements, and deviating from the recommended oil weight can adversely affect oil pressure, lubrication performance, and component longevity. This serves as a reminder that manufacturer oil specifications are established through extensive engineering and testing to ensure proper engine operation and durability.