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Message: [QUOTE="Wayne, post: 802305, member: 863"] Has anyone got cruise control working on a 6.4 with a 4r? That would be a huge drawback to me. The main complaint of a 5r compared to 4r is interference shifting. With good tuning it s not much of a problem until you start knocking on 10 second 1/4 mile times. Then the simplicity of the 4r has more appeal, even though it's been proven that a 5r CAN run in the 9's. Allison also has interference shifting, but you don't see too many trucks swapping it out for something else because you need a REALLY fast truck to justify the change. At that point, you still fight shafts (at least on 4&5r's) as the weak link, so for a dedicated race truck, you might as well put your big boy pants on, and do a real race trans. I totally see the point of companies who build performance transmissions to use them in shop race trucks for r&d though so nobody needs to get their panties in a bunch. I'm not telling anybody what to do, just sharing my observations. [/QUOTE]

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