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My Heavy Duty truck currently has Regular Duty rear leaf springs. The original springs broke when my dad owned the truck and had it a little over loaded. New Heavy Duty springs were too expensive, and were not available in the junk yards, so he replaced them with Regular Duty leaf springs.

On Regular Hardbody trucks, there are 3 leaves in the rear:

  • 2 at 7mm thick, and
  • 1 at 13mm thick.

On the Heavy Duty Hardbody truck, there are 4 leaves in the rear:

  • 2 at 8mm thick, and
  • 2 at 14mm thick.

Picture from the 1994 Service Manual

I was on Courtesy Parts yesterday looking at new rear leaf springs for my HD truck because no local junk yards and no eBay sellers have had the "HD" rear leaf springs for over a year.

Yikes! New springs are still expensive @ $343.72 for each side!

Both were the same price, so what is the difference?

Does the newer version have something that was improved upon? Would it still fit in my 1994?

I'd always thought if I found any HD version truck that I would be able to use those rear leaf springs. Now I wonder if I need to pay attention to the year as well.

By the way, if anyone has a pair of rear leaf springs for the Heavy Duty Hardbody truck, I am interested in them!

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One trick I have used over the years is to look at aftermarket suppliers. They seem to be much more open and knowledgeable about year to year variations. If you check several suppliers and the model years overlap, the parts will fit. If they breakdown to separate model years there is a reason for it. In some instances the parts will interchange only if both sides are replaced. – mikes Jul 27 '12 at 17:10
I can't afford new (OEM or aftermarket), so my only option is to sort this out with parts off of existing vehicles. The aftermarket does not even list the HD version of the D21. These Longbed 3/4-ton and 1-ton models were not common. – jp2code Jul 27 '12 at 18:07

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