SKU: 8091182101

1988 - 2021 Navistar International 9700, 9800, 9100-9400, Lonestar, Prostar, 8200 and 8300 Front Leaf Spring - 2 Leaves - 55-144

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Description

1988 - 2021 Navistar International 9700, 9800, 9100-9400, Lonestar, Prostar, 8200 and 8300 Front Leaf Spring - 2 Leaves - 55-144*Diagram Spring May Differ From Actual Spring* Number of Leaves 2 (PD 2 2PD) Leaf Spring Width 4" A Leaf Spring Length: 29" B Leaf Spring Length: 29" C Leaf Spring Arch: 4 1 2" D Leaf Spring Pack Thickness: 2 7 8" Leaf Spring Capacity: 5,350 lbs. Leaf Spring OEM Number: 1664618C91 Leaf Spring Eye Threaded Bushings: Front TB 26 Rear TB 26 Leaf Spring Material: Pad 1 . 323, 2 . 815, Pad 2 . 401 Full Taper Location Front Second Design Verify the OEM part

  • *Diagram Spring May Differ From Actual Spring*
  • Number of Leaves - 2 (PD/2/2PD)
  • Leaf Spring Width - 4"
  • A - Leaf Spring Length: 29"
  • B - Leaf Spring Length: 29"
  • C - Leaf Spring Arch: 4-1/2"
  • D - Leaf Spring Pack Thickness: 2-7/8"
  • Leaf Spring Capacity: 5,350 lbs.
  • Leaf Spring OEM Number: 1664618C91
  • Leaf Spring Eye Threaded Bushings: Front TB-26 / Rear TB-26
  • Leaf Spring Material: Pad 1/.323, 2/.815, Pad 2/.401 Full Taper
  • Location - Front
  • Second Design


Verify the OEM part number and measurements to confirm compatibility before purchasing. Need help? Visit: How to Identify a Leaf Spring.

 

Leaf spring 55-144 is the front leaf spring for Navistar International 9700, 9800, 9300, 9100, 9100i, 9200, 9200i, 9400, 9400i, Lonestar, Prostar, 8200 and 8300. The spring is 4" wide, is a 2 leaf full taper spring with 3 pads, has threaded bushings and has a capacity of 5,350 lbs. The OEM part number is 1664618C91.


Models And Year Ranges:

Fits: 1988-1999 Front Navistar International 9700

Fits: 1996-1999 Front Navistar International 9800 (With Set Back Axle)

Fits: 1988-1999 Front Navistar International 9300 (With Set Back Axle)

Fits: 1989-2011 Front Navistar International 9100, 9100i, 9200, 9200i, 9400 and 9400i

Fits: 2007-2016 Front Navistar International Prostar

Fits: 2008-2021 Front Navistar International Lonestar

Fits: 1988-2000 Front Navistar International 1988-2000

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SKU: 8091182101

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Drew Amador
Battle Creek, US
★★★★★ 5
Just buy them
Color: Black,navy,burgundy,brown, Size: Small
Used to wear sliders all the time, figured i'd switch it up. These are super comfortable, probably the best material underwear I own. Great to just lounge around it or wear everyday. Fit is really good, I got a small and about 29-30" waist. Good bang for your buck too. I've washed them a handful of times and they hold up great, fit great and dont' shrink.
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Reviewed in the United States on May 7, 2026
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Verified Purchase
Darling Dumpling
Phoenix, US
★★★★★ 5
Good underwear. Husband likes them.
Color: Black, Size: Large
Husband wears XL and XL fit well. This is the second pack I got for him. They are decent quality, look and feel nice, not baggy yet not too tight anywhere. They are somewhat thin (but still supportive) and do not make him sweat more so he loves that. No problems washing (they didn’t shrink). Will continue to repurchase these.
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Reviewed in the United States on May 11, 2026
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Joe Kool, Sr.
Natrona Heights, US
★★★★★ 5
Comfortable
Color: Black,navy,burgundy,brown, Size: Medium
I have had a lifetime of different briefs, some name brand, some generic. I am 165 lbs, wear Medium, and these are closest to feeling commando of anything I’ve ever worn. Comfortable, not too tight waist and legs, and yes silky touch yet not slinky. Maybe not for support wear, but casual and cool comfort, the “Cat’s meow”. I just came on to order some more
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Reviewed in the United States on April 30, 2026
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Verified Purchase
Uncle Steve
Fort Morgan, US
★★★★★ 3
Great fabric - pouch too small!
Color: Black, Size: X-Large
First, the fabric used is wonderfully soft and comfortable. It;s the first thing noticed when package was opened. Strange, but the elastic waistband is about 1/2", very similar to a woman's style panty. But it's comfortable and easily acceptable. The main problem is that the pouch that holds your "stuff" in place, is oddly and unnaturally small. Small enough where this average man's "stuff" tends to fall out of the pouch on one side or the other. I sleep in my underwear, and every time I did with these, I awoke with the front pouch off to the side and everything down there was hanging outside of the underwear. They also seem to do well through a wash cycle. However, if the main reason for wearing underwear is to keep your stuff in place, these fail from the beginning. I ordered another brand from overseas, and they had the exact same problems as these! I wonder if that's just how they make them outside of the USA. The Bottom Line? Uncle Steve Disapproved!
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Reviewed in the United States on October 30, 2025
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SareBear
West Palm Beach, US
★★★★★ 5
Premium cotton underwear at a modest price. Highly recommend!
Color: Multicolora6-4 Pack, Size: X-Large
Bought my husband 2 variety packs of these, and they are still great over 2 years in. High quality cotton briefs are breathable, colors are vibrant, and the fit is spot on. A good value at this price point compared to designer brands, and the product overall exceeds expectations in terms of comfort level, durability and appearance.
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Reviewed in the United States on April 11, 2026

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