So when Kyle was over and we were making his transmission skid, and I think we figured out why many of our stock TBs have slightly different spring rates, left to right. The engine/transmssion/T-case/driveshaft/pumpkin aren't in the center of the vehicle. They are all ~1.5-2" off center, toward the passenger side.
Mike
Reason for Different Spring Rates L-R?
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- bartonmd
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Wonder the reason for that. Is the rear axle off center? Or are you talking about the front
- Rob93
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I'm talking about the rear.
Mike
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That should make for different length shafts on each side then. Seems strange. Should have known better from the oddball tb!
- Rob93
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I get it. The splined disconnect is thinner than the differential, so of course the engine has to be offset to allow the CV shafts to be identical. 
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The Roadie - Founder
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seems like it would have been easier to center everything, use the same springs and different CV shafts or make the disconnect housing larger to accommodate the same CVs.
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Same cvs is cheaper than same springs since they already make different spring rates anyway.
they've always worked for me.
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Yep, and the pinion is already offset a couple inches in the rear end, anyway.
Mike
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I also suspect centering the engine would have caused the driver's side half shaft to be too short for proper suspension travel without increasing the front track width.
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fishsticks wrote:I also suspect centering the engine would have caused the driver's side half shaft to be too short for proper suspension travel without increasing the front track width.
Exactly.
Mike
- bartonmd
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Interesting. And since the springs are computer selected, I'm guessing that there is some sort of stepped solution matrix. Some trucks might have been in the weight bracket that required different springs L & R, while others might have been slightly heavier or lighter, and been in a weight class requiring the same springs L & R (like mine, 83s left and right).
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In the Toyota world this is a very common thing. On the 4runner and Tacoma's they account of the Fuel Tank, Battery and driver all being on the driver side by using a firmer spring rate. Usually about a 30-60LB spring rate difference. Off the line they want the truck to sit level with a full tank, and only a driver.
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