Rancho RS5147's or RS5112

Rancho RS5147's or RS5112

Postby cybrvanr [OP] » February 24th 2017, 2:38pm

I am planning on a 2 inch lift on my 2000 Astro. I want to first purchase new shocks. With the stock height, the RS5150 is recommended. I was wondering if I could use the 5150's with the 2 inch lift once it is done? Also, could I use the RS5112 at the stock height prior to performing the lift? Those are 2 inches longer, but didn't know if they would bottom out too quickly for the short duration prior to me installing the lift kit.
1988 Astro CL 5-speed 4.3 TBI
2000 Astro AWD LS
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Re: Rancho RS5147's or RS5112

Postby Lumpy » February 24th 2017, 3:28pm

Some confusion in the part numbers, perhaps a typo?

In any case -

5150 -
Extended Length (in): 16.125 in.
Collapsed Length (in): 11.500 in.

5147 -
Extended Length (in): 23.120 in.
Collapsed Length (in): 14.750 in.

5112 -
Extended Length (in): 26.250 in.
Collapsed Length (in): 16.000 in.

Measure/estimate the travel of your axle in the stock config. Measure/estimate the same thing with your lift. Plug in the shock that's the appropriate length.

Keep the geometry of the shock in mind as you estimate. The axis of the shock is the hypotenuse. They don't travel just up and down vertically. They're on an angle. 1" of axle movement does not equal 1" of shock movement.


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Re: Rancho RS5147's or RS5112

Postby cybrvanr [OP] » February 24th 2017, 7:57pm

From many of the responses on here looking around, it appears the KYB monotube shocks are better shocks than the Rancho's

The 565050 is spec'ed for the Astro, but they are shorter than the Rancho 5147's
565050 22.52 14.49 8.03 X X – E2(12×42) E2(12×42)


The ones specified for the Dodge Durango howver have the proper mounting size, and the additional lenghth I will need for my slight lift:
565079 24.61 15.75 8.86 X X – E2(12×42) E2(12×42)


I am also looking at upgrading the stock 1400 pound leaf springs to heavier duty 1750 pound leaf springs at the same time
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Re: Rancho RS5147's or RS5112

Postby Lumpy » February 24th 2017, 8:09pm

Um, ok.


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Re: Rancho RS5147's or RS5112

Postby TurnNburn » February 24th 2017, 8:20pm

Lumpy wrote:Um, ok.


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