72 J2000 63" rear spring conversion

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CarlJ2000
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Joined: Sat Jan 21, 2012 7:42 am

72 J2000 63" rear spring conversion

Post by CarlJ2000 »

Does anyone have an approximate lift amount using Chevy 63" rears under the frame rails?

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Carl72J2000
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Re: 72 J2000 63

Post by Carl72J2000 »

CarlJ2000 wrote: Sun Nov 24, 2019 7:48 pm Does anyone have an approximate lift amount using Chevy 63" rears under the frame rails?

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Perhaps I should expound a bit. I was originally going to lift my truck approximately 4” and trim to fit 37s. I was going to accomplish this by doing a swap to 63s with new hangers but still mounted outboard. I had a new set of 40” Trepadores fall into my lap at a price I couldn’t pass up so now I need to lift my truck a few more inches. I prefer minimal lift and trimming to keep my rig low. My plan for the front is coil overs with either a three link or radius arm set up.
1972 J2000


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Topic author
CarlJ2000
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Re: 72 J2000 63" rear spring conversion

Post by CarlJ2000 »

Never mind, found the answer on the mother ship.

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LMJ20
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Re: 72 J2000 63" rear spring conversion

Post by LMJ20 »

So what is tha amount of lift the 63s will give you under the frame?

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Carl72J2000
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Re: 72 J2000 63

Post by Carl72J2000 »

Approximately 10.5” spring over axle. I got exactly 3.5” spring under with a 14 bolt axle.
1972 J2000


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Tad
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Re: 72 J2000 63

Post by Tad »

Not to chime in late but I am going to.
There are three versions of the 63’s (actually 64’s but who cares)
There is the 3-1 pack (three plus the overload)
4-1 and 5-1.
They will all give different lift height.
I ran the 3-1 with the overload spring removed for 10 years, it matched your basic SOA very well.
They started sagging and warping about 6 years in, so the overload went back in.
They are now toast, warped to BEEP now so I have new ones going in.
Nothing wrong with getting 10 years out of a spring but I highly doubt someone got 10.5” out of a 63” spring swap unless they are not counting a bigger tire size.
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Topic author
CarlJ2000
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Re: 72 J2000 63" rear spring conversion

Post by CarlJ2000 »

This is on the tires supporting its own weight. SUA with 64" 3 leaf+overload springs w/ the overload removed and a short add-a-leaf installed. After bouncing on the rear to settle the suspension some it measures 6" of lift It should settle some with use. Shackles are 6".
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