Extended cab 45 SWB from a 40 (1 Viewer)

[Ditcherman]

I spent some time yesterday and re-measured everything for the rear 4-link. I think the issue may be roll-oversteer and not bump steer. When I initiate a turn with the wheel, the vehicle starts a turn and then a half second later with no more wheel input the truck starts to turn more, so you end up having to catch it with the wheel. It's not so abrupt that it's dangerous but really annoying and takes way more effort to drive than I want.
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This is what I ended up with using the TMR customs combined frame side brackets. I think I need to get the 2-degrees roll oversteer to 2-degrees roll understeer. Playing with the calculator it looks like moving the lower links, frame side in and down to triangulate it more will give me a 4-degree swing in roll steer. I think I can take a piece of 3/16" 2x4 tube and go across the frame under where the links mount now and get what I need.
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I may have to french the link brackets into the 2x4 a little bit, because the lower they go the lower my anti-squat number goes. Currently at 93% it seems to deliver torque nicely.

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I bet you’re on to something with the oversteer.
I only know from reading, as opposed to experience, but Treefrog on irate, the author of the link calculator, has seemed to me to be a lot less concerned about the anti numbers as time has gone on, but is still very concerned about oversteer numbers.
I made sure to have understeer but had to compromise on my anti numbers and I’m at 63% on the rear with 50% drive bias.

I would think 93% is plenty high especially if you can achieve it and understeer.