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That's why propshafts have sliding yokes - to allow the axle to move back & forth relative to the gearbox.
And I thought that was to allow up and down movement of the axle without "polevaulting". Because the driveshaft is at an angle it needs to move back and forth relative to trans or axle. (Higher pinion angle and/or more travel needs longer slip).
But the longer I think about it I think you're right about axle moving on compression. If the distance from eye to eye gets longer, the distance from spring pad to front eye AND distance from spring pad to back eye increases.
Shackle in the back takes up rear difference. Front is fixed therefore the spring pad would be moving back.
No shackle=no suspension
Front and rear shackle= axle flopping about
But by that logic how do Trac-bars EVER work?
Last edited on Mon Mar 30th, 2020 03:51 pm by Arthur
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2008 XLT 4x4 4.0 5Spd. Pretty much stock except 33's and Bilsteins: A bit broken for now.
2007 FX4 Level II auto: new project!