SKU: 90977264492

2007 - 2021 Navistar International 8500, 8600, Transtar, LH & RH Series, 9100, 9200, 9400, Lonestar, Prostar, 8200 and 8300 Front Leaf Spring - 2 Leaves - 55-1218

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Description

2007 - 2021 Navistar International 8500, 8600, Transtar, LH & RH Series, 9100, 9200, 9400, Lonestar, Prostar, 8200 and 8300 Front Leaf Spring - 2 Leaves - 55-1218*Diagram Spring May Differ From Actual Spring* Number of Leaves 2 (PD 2 PD) Leaf Spring Width 4" A Leaf Spring Length: 29" B Leaf Spring Length: 29" C Leaf Spring Arch: 3 7 8" D Leaf Spring Pack Thickness: 2 3 4" Leaf Spring Capacity: 5,350 lbs. Leaf Spring OEM Number: 3527263C91 Leaf Spring Eye Bushings: Front RB 253 Rear RB 253 Leaf Spring Material: Pad 1 . 323, 2 . 999, Pad 1 . 323 Full Taper Location Front Verify the OEM part number and

  • *Diagram Spring May Differ From Actual Spring*
  • Number of Leaves - 2 (PD/2/PD)
  • Leaf Spring Width - 4"
  • A - Leaf Spring Length: 29"
  • B - Leaf Spring Length: 29"
  • C - Leaf Spring Arch: 3-7/8"
  • D - Leaf Spring Pack Thickness: 2-3/4"
  • Leaf Spring Capacity: 5,350 lbs.
  • Leaf Spring OEM Number: 3527263C91
  • Leaf Spring Eye Bushings: Front RB-253 / Rear RB-253
  • Leaf Spring Material: Pad 1/.323, 2/.999, Pad 1/.323 Full Taper
  • Location - Front

 

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

 

Leaf spring 55-1218 is the front leaf spring on Navistar International 8200, 8300, 8500, 8600, Transtar, LH625, RH613, 9100, 9200, 9400, Lonestar and Prostar. The spring is 4" wide, is a 2 leaf full taper leaf spring with 2 pads, has rubber bushings and the capacity is 6,350 lbs. The OEM part number is 3527263C91.


Models And Year Ranges:

Fits: 2007-2021 Front Navistar International 8500 And 8600; Transtar

Fits: 2017-2021 Front Navistar International LH625 And RH 613

Fits: Front Navistar International 9100, 9200, 9400, Lonestar and Prostar (Conventional)

Fits: Front Navistar International 8200 And 8300

Shipping Notes
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Exchange/Return Notes
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SKU: 90977264492

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Grma4m&m
Boise, US
★★★★★ 5
They’re fantastic!!!!
Size: X-Large, Color: Multicoloured E-(5-pack)
My clothing size is 16/18 and XL. Even though Amazon suggested a size XXL, I ordered my normal XL and they fit perfectly. The fabric for this style is 92% bamboo viscose and is amazingly soft and almost silky feeling. I had ordered a different boy short in this brand but they were 80% bamboo viscose and the fabric was significantly heavier. I returned those and ordered these.
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Adia
Grantham, US
★★★★★ 5
My favorite underwear
Size: Medium, Color: Multicoloured C (5-pack)
Super comfortable!! They are soft and breathable. No pinching, no shifting, and relatively invisible in skirts, pants, and loose dresses. True to size. Excellent quality, holds up well. Only thing is that the wording on the front does come off after a few washes, so you have to differentiate the front from the back of the underwear by how high the seam comes up. I almost exclusively wear this underwear now, I love it!
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Musicbookfan
New York, US
★★★★★ 5
Incredible Comfort
Size: Large, Color: Multicoloured F (5-pack)
Amazing; I’ll be ordering more. Super soft, lightweight, smooth under clothes, incredible comfort! Best underwear! I ordered these because I’m tired of underwear lines when wearing biker shorts/leggings. Other boy shorts were too long or the bottom hem too thick and both of those issues left lines around my upper leg. THESE are *just right* - perfect length and fit. No panty lines on close fitting pants, comfortable under other pants and dresses, great with jumpsuits, and fit well under slip shorts with dresses. NOTE: These take longer to dry, than similar clothes, in the dryer. No shrinking though. SIZE: I ordered these in size L and they fit perfectly. A little snug when first on but they loosened up. For reference I’m 5’4” tall, about 175#, carry my weight in my hips and backside,wear size L sweats/pajamas/loose pants, size 12 jeans.
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Kathy M Gasperin
Lexington, US
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Full coverage and full comfort
Size: XX-Large, Color: Multicoloured C (5-pack)
These boyshort underwear are a dream. They’re very soft, very stretchy, and very comfortable. They do not shrink when they’re washed. They’re heavy enough to make you feel like you have something covering you for discretion, but light enough to wear under any type of fabric. I have wide hips and I’m older so I don’t have a tight perky butt anymore. Most underwear tend to either ride up on me or become very uncomfortable. These stay where you put them. And they come all the way up to your waist so that there is no panty line whatsoever. The waist line is soft and comfortably. It does not dig in. They do not ride up and drive you crazy they stay where you put them. I would recommend them to anyone young or old. I have tried so many different styles and materials to find underwear that’s actually comfortable. These are the absolute best I have tried in five years. I just threw all the rest of them out.
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Janet R Geisler
Charlottesville, US
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Bamboo is an amazing fabric
Size: Large, Color: Multicoloured I (5-pack)
Comfy and soft . I’ve never worn boy shorts before so takes adjusting to. Legs roll sliding pants up but easy to adjust and smooth before zipping up then all day comfort. When I wear skirts or shorts they are perfect for that! I use to wear bike pants under skirts that don’t have to anymore. I like that they don’t creep up like regular underwear. I’m a new fan of bamboo fabric and bought briefs in bamboo as well.
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Reviewed in the United States on May 9, 2026

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