[Jackpine]

Originally Posted by JWBFX4

Someone will correct me if I am wrong but I dont believe the edge/gryphon supports the 4.2L. But I think Bill has said that he can custom tune for them.

I think you're right about that JWB. Bill CAN program a Gryphon for the 4.2, but it will cost more since he has to build all the stock files from scratch. I don't know what the additional cost would be, trbsht, you'd have to call him to find out. (You might try a PM too, for this information).

I think e-fans would probably give you more power and improve your mileage. I'd say that is a reasonable mod to try. You didn't say what your gear ratio was, but I'm assuming it is 3.55. The new tires give you an effective ratio of only about 3.36. To get back to the "stock" ratio (for more power), you'd need to regear to 3.73 gears. (If it's a 4WD, you need to do both axles). You could get an increased feeling of power by upping the gearing to 4.10, which will give you a modest hit on fuel economy. I would not go higher than 4.10. If it were my truck and if it were 2WD, I think I'd go with the gears before thinking about a programmer.

- Jack