[80powerwagon]

In theory you should try 5th gear because it should be straight through you won't be turning counter shaft I believe. Correct me if I'm wrong but it should free up just a little power. There is a 528 hemi that pulls here and he has a NP435 and runs 4th gear because it is straight through.

 

[80powerwagon]

I also found out that with my 80 I was running 15mph at just over 7000rpm the guysthat beat me were running 19 & 20 mph so now I am switching trannys to get more ground speed. Ground speed is the key if you can pull more gear.

 

[80powerwagon]

Thats on my 1980 powerwagon with a 383

 

[80powerwagon]

Can you get that clutch rebuilt or is it not worth it

 

[80powerwagon]

Good luck in the pulls. I didn't know you were running such big tires. I can't wait to get my exhaust so I can pull a little here.

 

[80powerwagon]

How much for the Iron giant and can I still pull my 29' fifth wheel with it?

 

[80powerwagon]

There are big differences between sleds some let you get started easier and pull down the track farther it puts on a better show if you ask me and way easier on the clutch.