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Discussion Starter #1
So I took my truck to the Medford 1/4 dragstrip yesterday for the first time since I got it back together. I’m having some traction problems though and I was hoping for some advice. I’ve searched all over but can’t really find want I was looking for. Truck is a 66 F100 short bed 3900lbs with me in it. Motor is 460 .40 over SCJ heads and RPM intake with work done by the Mad Porter Cam is also from him. Suspension is DJM drop beams with new stock springs and DJM shocks rear is set up with factory leafs with one leaf removed and DJM rear shackle kit and DJM shocks. Rearend is Ford 9inch with 3.89 gears and locker. I installed cal tracs had 1/2 turn preload for first 2 passes and then went to 1 full turn preload still no luck I’m running mickey Thompson et street r’s 315/50-17. The rest of the night I tried longer burn out shorter burn out but no luck to get it to hook. I was foot braking it to about 2200. Any advice would be awesome. Here is a video of one 60 ft was 1.82..

https://youtu.be/XTiWN8ZSa7w
 

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Discussion Starter #3
First pass and the pass in the video were 24lbs then I dropped them down to 20lbs with no change in the way it hook
 

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The one thing I don't see is weight transfer and with a pickup I wouldn't expect it with the weight bias. I would throw 100 lbs or so in the bed, drop your tire pressure to 15 psi or so and test.
 
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