I would spend some time making sure it's not a balance issue, I had that on my 40 and it took some time to figure out which wheel it was coming from. It would only start at 50 and ended at 65, but it was a pain until I figured out which wheel.
Did you mount the pump low enough so that it's in as much fuel as possible. Just wondering if as you are using fuel it is getting warmer. I used a holley pump in mine and it actually gets quieter after about 30", I have a smaller tank and don't have any issues from fuel getting hot. Not sure on...
I have 7.5 and it is perfect with 37" tires. 95 mph and hands off steering wheel, although that was a one time deal. It drives great. I would shoot for 6 min, but your call.
I went and looked at it again, I am 6"s back. But my driveshaft is 32"s long with no doubler. Who do you have making your shaft? Modified toyota, or custom?
Yeah, it looks good where u have it. But I think you may have to comp cut the back. I guess you can run it and if you have issues move it back and cut more out. Have you thought about running longer leafs. I used tahoe and they are awesome as far as flex goes
Definitely move your axle back as far as you can, especially if you are raising the engine and tranny. 17 is scary short, any way you can go forward with engine?