Dodge Transmission

The OM3GA

Sun Coast calls this transmission package the OM3GA. It's a Dodge 47RE/48RE-based four-speed automatic designed to handle obscene amounts of horsepower and torque. It can be tailored to a variety of applications, including Ford, Dodge, and Chevy diesel trucks. This transmission was developed through the years as Cummins racers and hot-street-truck owners advanced their engines' horsepower levels.

Strength Training 

In the beginning, Cummins-powered Dodge trucks wiped out torque converters. Then the weak link moved to the input shafts. That led shops like Sun Coast to develop better converters and input shafts machined from billets of high-strength steel. These "billet shafts," as they are often called, still weren't always strong enough. The Sun Coast OM3GA fixed this problem with the introduction of a larger-diameter input shaft.

Increasing the diameter of the input shaft meant custom pump gears had to be made, along with a custom stator support, stator, and torque converter. The intermediate and output shafts have also been upgraded with billet shafts machined from 300M alloy.

OM3GA transmission installed in the J&H Performance Ramcharger.

A)   Short output shaft

B)    Mag – Hytec pan for additional cooling

C)    Universal TH350 crossmember for engine swaps

D)   Flexplate speed sensor that sends out a V-8 tachometer signal to run a variety of electronics.

Power Application
Unfortunately for mega-horsepower diesel owners, the carnage didn't end there. Bands would be destroyed, clutches would slip, and drums would explode, so the OM3GA transmission uses a revised clutch count and a rigid Second gear band (with more apply area), as well as a billet drum and steel planetary gears. The transmission has an increased-pressure Second gear servo, which meant the strut, anchor, and apply levers all had to be custom-made by Sun Coast.