I can't help you with price but I can tell you the Jake will be a good addition to that engine. I drove a White with a 300 L10 equipped with a Jake throughout the Hudson Valley and it was very effective. I often grossed real close to the 80,000lb limit. I'm pretty sure this engine allows 3 settings, my memory isn't the best. I routinely did an 80,000lb haul coming down off Mountain Top, Pa and I was damn glad I had it!