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Old 05-30-2013, 09:41 AM
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You could use an adjustable shock, just not coilovers. A supercharger is more manageable than a turbo for autocrossing, but can get expensive. I focus on handling to start with, you can always add more power later.
I looked up the Goodguys autocrossing rules. The event at Pleasanton is the only one they have where your truck is allowed, otherwise it's too new. https://www.good-guys.com/events/goodguys-autocross
One class for all the trucks means you could have some tough competition, but I know from experience you don't have to win to have a blast cutting corners and making cones fear for their lives.

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Old 05-30-2013, 09:43 AM
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Astroracer has the right idea!
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Old 05-30-2013, 09:52 AM
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I wouldn't discount the 60-72 truck arm suspension in the rear. Look at every NASCAR and NASTRUCK out there. They all use this truck arm setup. For handling, they work VERY well. For hauling a heavy load, not so much, hence GM dropping them in later years and making leaf springs an option during these years.

Your biggest problem is going to be weight transfer. With a light back half of the vehicle, getting it to hook up coming out of corners will be the hardest part. A big thing that helps that is an engine set back. Getting more weight moved to the rear and off the front will gain you the biggest benefits. The other problem you have with a truck platform is frame twist. Until you get into later years with boxed frames, most open C types just have too much twisting action which make dialing in a suspension very hard.

Another trick when I used to autocross was to dial in a little toe out. (1/16"). This would make turn in quicker but a little more twitching in a straigth line for daily driving.
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Old 05-30-2013, 09:57 AM
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When one get serious about autocross one can spend a great deal of cash on suspension..We used to take a whole box of springs with us to the track when we were doing test and tune..As well good bucks were spent on shocks that are adjustable..Sway bars are a whole nother story to get the balance right on a particular rig,,

All is not lost though just get out there and run the truck study and make mods as the budget fits and someday you will run up front..

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Old 05-30-2013, 10:21 AM
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thanks mark,

i will be swapping out the 307 to 350 due to the fact that i still have to smog the truck, california....meeeh. seeing that they only made it till '74 i can't have it in the truck. the th400 is a plus that im getting with the 350. package deal for $400. (i will r&r both of them before putting them into my truck)
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Old 06-18-2013, 09:48 AM
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All good suggestions above... One item I did not see listed was to upgrade the power steering box to a higher ratio turn box. Autocrosses are notoriously tight requiring a lot of aggressive steering.
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