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Unread 07-16-2013, 12:10 AM   #1
Xzero117
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question regarding factory replacement "heavy duty springs"

I want to replace the old sagging springs on my jeep, I currently have 1 inch lift boomerang shackles on it giving me 1 inch of lift and a 1 inch body lift

my question is, what is the deal with the "heavy duty" standard replacement springs, as opposed to the "standard" duty replacement springs ?

is there a difference in height between the two ? a difference in ride quality ?

I recently did a 350 sbc swap so the front end is about 50lbs heavier than stock up front, thus why i'm considering the "heavy duty" spring set

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Unread 07-16-2013, 12:13 AM   #2
Michaelgoesrawr
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I believe the "heavy duty" would be for the hard top. Mine came with a soft top and the tires scrub the fenders on rolling bumps with the hard top on.
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Unread 07-16-2013, 12:15 AM   #3
Xzero117
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In case someone suggests lift springs, I'd rather keep the jeep with just a 1 inch suspension lift as not to effect with it's on-road manners and stability too much, the toughest obstacle i'll see is a snowday or two in a year.
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Unread 07-16-2013, 12:17 AM   #4
Xzero117
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Quote:
Originally Posted by Michaelgoesrawr View Post
I believe the "heavy duty" would be for the hard top. Mine came with a soft top and the tires scrub the fenders on rolling bumps with the hard top on.

i see, mine came standard with a hardtop, so i guess i should just go straight with the heavy duty set
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Unread 07-16-2013, 12:17 AM   #5
Michaelgoesrawr
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Quote:
Originally Posted by Xzero117
In case someone suggests lift springs, I'd rather keep the jeep with just a 1 inch suspension lift as not to effect with it's on-road manners and stability too much, the toughest obstacle i'll see is a snowday or two in a year.
I understand. Personally I'd weigh the 1"-1.5" lift spring options to help with the additional weight of the motor.

And in your case I'd go with the heavy duty.

Edit: Yeah, what you said.
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Unread 07-16-2013, 12:24 AM   #6
kgb_m3
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Heavy vs regular is simply added spring rate and sometimes added leaf to a pack. 4 pack spring with lower spring rate is regular duty. 5 pack or more with higher spring rate is heavy duty. Accounts for hard top, heavy bumpers, winch, etc..
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Unread 07-16-2013, 09:26 AM   #7
bmedeiros678
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Heavy was for hardtop. Just replaced my wife's last year with stock replacement heavy duty from crown. Was under 400.00 for all four if I remember correctly. I live in MA so am able to deal with them directly.
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Unread 07-16-2013, 10:29 AM   #8
Rproject
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I looked at both Crown springs and lift springs when I upgraded last year. I ultimately decided to go with lift springs, but that was my decision. If I had not gone with lift springs, heavy duty Crowns would have been my second choice. The Heavy Duty springs are supposed to be for 6-cyl motors and vehicles with hard tops. The Standard Duty are for 4-cyl soft top models. That information came from Morris 4x4, whom I trust when it comes to buying schtuff of the Jeep.
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