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Old 11-19-2015, 01:13 PM   #1
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Basic suspension lift question (89 Burb V2500)

A "suspension lift" usually involves larger leaf springs and a block that goes in between the axle and the leaf spring. So what people call a "4 inch lift kit" amounts to larger leaf springs and a block that, when installed, add approximately 4" of additional height to the rig. CORRECT?

On the other hand, a "shackle flip" kit actually replaces the rear spring shackle with a new unit that reverses (flips) it. The end result of a "shackle flip" is an increase of overall height of the rig, usually in the range of 4". CORRECT?

A "shackle flip" is considered superior to the usual "4 inch lift kit" (larger springs and blocks) because it involves greater stability/flex and overall sturdier construction and better handling. CORRECT?

Reason I'm asking: my 89 Burb 2500 (3/4 ton) has a block lift. I think it is a 4" lift, but when put on a 3/4 ton truck, the end result is probably more like 6". It frankly is a bit more than I want/need, as far as overall height and driveability.

SO: what happens if I get rid of the blocks and put on a shackle flip? What do I need to do to be sure that the rear axle ends up at the same height as the front axle?

Sorry for the "noob" questions and thanks for all input.
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Old 11-20-2015, 09:48 AM   #2
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Re: Basic suspension lift question (89 Burb V2500)

The leaf springs aren't necessarily larger, they just have more arch to lift the vehicle. True that a suspension lift might use springs with more arch in combination with lift blocks. A shackle flip does give 4" lift and people say it does ride better and work better off road. Can you post up a picture of the truck?

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Old 11-20-2015, 11:30 AM   #3
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Re: Basic suspension lift question (89 Burb V2500)

Pic 1 is a standard stock shackle

Pic 2 is a DIY flip shackle

Pic 3 shows what happens to the rear pinion when you install a shackle flip - it gets moved up and changes driveshaft geometry / internal lubrication. On a 4" lift it may or may not create a vibration - meaning you may or may not have to adjust the pinion angle back down with a shim kit or re-welding the perch. It may also cause the pinion bearing to get less lubricant - although I've never seen a problem with that.

The flip kit improves articulation and is supposed to improve / eliminate any rear axle/wheel hop.

More answers to your questions:
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Last edited by Front Range; 11-20-2015 at 11:30 AM. Reason: adding pictures
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