I almost did that swap into a super duty. For gears, you need some freeway flyers, 3.55 at the steepest if you dont have overdrive. Trans, I was going to use an Allison AT545 with mine, mainly due to the size and quicker shifts than the bigger ones. Suncoast makes a better converter for them to take away the rubbe band feel. The 545 is a non-lockup, non-overdrive auto, but does have 4 nicely spaced / progressive gears. For a manual, you should be able to fit an RT or RTO610, but that's more fab work with the clutch. If you're gonna up the power too much, you better have some good axles & shafts.
Fitment.... newer is better. There's a 466 swap being done to a 74 krew kab, and the back 2 cyls are in the cab. The 99 that I was gonna do, I was only needing to go into the cab about 3-4".
With that governer, there's no 3k gov spring kit. You can make your own. Take out the smallest spring in the gov spring pack. Make/ grind down 2 washers that fits the diameter of the spring and still fits in the stud. Make sure it's around 1.55mm thick for best results. Put a washer in each set of springs, and tighten to 2 -4 clicks past the factory setting(measure the original stud protrusion). You should hit at least 3200 like that. Besides that, it takes fuel and timing with your turbo. Those 3LM's arent that big are they?
Last edited by nevrenufhp; 11-01-2009 at 12:05 PM.
Reason: Automerged Doublepost