Bigger diameter tires is the easiest way to add road speed. (I'm using 8.25-20's-wanted 9.00 Radials but ran outta $$$$ ) Upgrade your brakes at this point. Make sure your suspension and ESPECIALLY your steering are in VERY good shape and properly adjusted.Then add some more power.You'll need it. Next is an overdrive transmission. My '54 GMC 2 Ton has been upped to a 302 and Clark 5 speed with a .85 Overdrive 5th. I also have a 5531 Brownie,with a .74 Overdrive. It's happiest (smoothest and quietest) in 4th and Overdrive,in High range on the 2 speed axle. I don't have enough power to run both Overdrives,and loaded it's 4th and Direct...the steering is in great shape,and I upgraded to a dual reservoir master cylinder for a mid 70's one ton van-no booster,though there's plenty of room for one if I decide I need one. With all the gearing, top speed in 5th/Overdrive/High range at 3400rpm would be something like 118 mph,and my crawl speed in Low/Low/Low at idle is something like 0.336 mph. Fun,huh?
RULE #1-Speed costs money-how fast do you wanna go?
Speed
