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Old 12-11-2017, 02:55 AM   #9
'63GENIII
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Join Date: Sep 2008
Location: San Carlos, Ca.
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Re: Shackle flip lift vs spring lift

Agreed on all the above. Added points for getting rid of the lift blocks.

One thing to consider is that since you would be bringing the rear spring eye farther from the frame (and further into the arc created by the stationary front eye) , you'll find that the drive shaft will actually compress slightly. As Zoomad said, DS angles will get a little weird. Even on a long bed.

This would be a great time to get the perches replaced with a set that allows the axle to be moved rearward 1" and then get the pinion angle dialed in as well. They're super cheap and easy to weld on. Small adjustments can be made with the zero rate springs (which are just 1" steel blocks).

You might also be able to keep your overload springs intact with the flip. Ive never bought rear lift springs but can't recall any of the ones that I've looked at coming with OLs on the bottom. I could definitely be wrong on that though.
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'63 k15 long step
Vortec 7.4 - L29 Blackbear tune, Five 0 Motorsports injectors, Chris Straub Cam, NV4500, divorced 205
52" front and 63" rear spring swap
D44 / 14bff - disc axles
Milemarker 9K and 10.5K hydraulic winches

63" & B52 Spring Install http://67-72chevytrucks.com/vboard/s...ng+swap+thread


NV4500 Reverse Build Thread http://67-72chevytrucks.com/vboard/s...=reverse+build

L29 - 7.4 Vortec Build http://67-72chevytrucks.com/vboard/s...&highlight=L29
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