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Description
1987 - 2006 Navistar International 1000, 2000, 4000 and 7000 Front Leaf Spring 55-160*Diagram Spring May Differ From Actual Spring* Number of Leaves 8 Leaf Spring Width 4" A Leaf Spring Length: 25" B Leaf Spring Length: 29" C Leaf Spring Arch: 4 1 4" D Leaf Spring Pack Thickness: 4 1 8" Leaf Spring Capacity: 8,100 lbs. Leaf Spring OEM Number: 1667488C92 Leaf Spring Eye Bushings: Front RNK Rear RNK Leaf Spring Material: 4 . 527, 4 . 499, Bracket Location Front 9,000 lb. 20,000 lb. Axles Only Verify the OEM part number and measurements
- *Diagram Spring May Differ From Actual Spring*
- Number of Leaves - 8
- Leaf Spring Width - 4"
- A - Leaf Spring Length: 25"
- B - Leaf Spring Length: 29"
- C - Leaf Spring Arch: 4-1/4"
- D - Leaf Spring Pack Thickness: 4-1/8"
- Leaf Spring Capacity: 8,100 lbs.
- Leaf Spring OEM Number: 1667488C92
- Leaf Spring Eye Bushings: Front RNK / Rear RNK
- Leaf Spring Material: 4/.527, 4/.499, Bracket
- Location - Front
- 9,000 lb. - 20,000 lb. Axles Only
Verify the OEM part number and measurements to confirm compatibility before purchasing. Need help? Visit: How to Identify a Leaf Spring.
Leaf spring 55-160 is the front leaf spring on 1987 - 2006 Navistar International 1000, 2000, 4000 and 7000 heavy duty trucks. The spring is 4" wide, is a 8 leaf spring with a bracket and the capacity is 8,100 lbs. The OEM part number is 1667488C92.
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4.1 ★★★★★
Based on 341 reviews
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Product Reviews
★★★★★ 5
Good value
Model: NewSLS50_52, Model: NewSLS50_52
Working perfectly. Install of stereo equipment and carpet left me wanting some heat and sound resistant materials.
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Reviewed in the United States on March 23, 2026
★★★★★ 5
BUY THIS ONE!
Model: NewSLS50_52
This is one of the good ones. There are other brands just as good, and manny brands are worse, but this handles well, rolls down easily, doesn't come off at all easily, and adapts to dips and curves like a champ.
Appropriately heavy and dead, I'm happy with the way it smothers panel resonances and even at muffling direct sound, like a big hand over my Uncle Harry's eternally noisy mouth. You can rip the foil but you have to work hard at doing that.
Remember to buy a brayer; you can roll overlaps nice and thin. Also remember to pre-wipe the sheet metal with a decent solvent like acetone or Stoddard/Varsol. It should last forever.
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Reviewed in the United States on April 26, 2025
★★★★★ 5
Good stuff, but watch the temp
Model: NewSLS50_52
I used this in my single cab pickup truck (89 ford.) It only took half the box (10 sheets or 25 square feet) to do the floors, but I bought the big box because I plan to do the doors, back wall, and maybe the roof as well. One thing I learned is that the temperature matters when you’re doing the installation. It was around 55F when I started in the evening, and when it dipped down into the 40s the sheets would not stick to the metal, and were hard to compress with the roller. That’s why I ended up only doing the floors and not any vertical surfaces; i will have to wait for a nice hot day. The other thing is that the foil layer on top is razor sharp at the edges, definitely wear gloves! I didn’t notice until after but I have little papercuts all over my fingers. Aside from those things, the install was easy and straightforward. The sheets cut easily with scissors, and any goo that ends up on your hands or scissors can be cleaned up with acetone (nail polish remover), or lacquer thinner. I would use this stuff again.
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Reviewed in the United States on November 16, 2023
★★★★★ 5
Very efficient!
Model: NewSLS50_52
Amazing the difference it makes on dumping the noise. Very easy to install. Pell and stick literally! Great!
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Reviewed in the United States on November 23, 2025
★★★★★ 5
Cost effective
Style: 8.7 sqft（8 pcs）, Material Type: Aluminum 197 mil
Nice, cost effective material. It stuck nicely to the door and was fairly easy to use. The grid marks on the back made it easy to cut. I would not rank it up with other materials in sound and heat isolation, but it did cut down the overall vibrations on the door panels and I did not feel heat immediately from the floor area as i did with bare metal. If you are working with a budget and want modest improvement, this material will work well over most stock materials.
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Reviewed in the United States on June 7, 2026