SKU: 81234961829

2006 - 2021 Kenworth & Peterbilt T400-T880, W900B-W990 And 357-587 Front Leaf Spring - 2 Leaves - 59-548

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Description

2006 - 2021 Kenworth & Peterbilt T400-T880, W900B-W990 And 357-587 Front Leaf Spring - 2 Leaves - 59-548*Diagram Spring May Differ From Actual Spring* Number of Leaves 2 Leaf Spring Width 4" A Leaf Spring Length: 27 5 16" B Leaf Spring Length: 32 1 4" C Leaf Spring Arch: 6 3 16" D Leaf Spring Pack Thickness: 2 1 4" Leaf Spring Capacity: 6,000 lbs. Leaf Spring OEM Number: B81 6012 001, B81 6012 004 Leaf Spring Eye Bushings: Front RB 295 Rear RB 328 Leaf Spring Material: PD . 214 2 . 984 Location Front Verify the OEM part number and measurements to

  • *Diagram Spring May Differ From Actual Spring*
  • Number of Leaves - 2
  • Leaf Spring Width - 4"
  • A - Leaf Spring Length: 27-5/16"
  • B - Leaf Spring Length: 32-1/4"
  • C - Leaf Spring Arch: 6-3/16"
  • D - Leaf Spring Pack Thickness: 2-1/4"
  • Leaf Spring Capacity: 6,000 lbs.
  • Leaf Spring OEM Number: B81-6012-001, B81-6012-004
  • Leaf Spring Eye Bushings: Front RB-295 / Rear RB-328
  • Leaf Spring Material: PD/.214 2/.984
  • 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 59-548 is the front leaf spring on Kenworth W900B, W900L, W990, T400, T440, T450, T470, T600, T660, T680, T800 and T880. Also fits Peterbilt 365, 367, 384, 386, 388, 389, 567 and 587. The spring is 4" wide, is a 2 leaf spring and has a capacity of 6,000 lbs. The OEM part number is B81-6012-001 and B81-6012-004


Models And Year Ranges:

Fits: 2006-2021 Front Kenworth T400, T440, T450, T470, T600, T660, T680, T800 and T880 (12,000 lb. - 14,600 lb. Axles Only)

Fits: 2008-2021 Front Kenworth W900B and W900L (12,000 lb. - 14,600 lb. Axles Only)

Fits: 2019-2021 Front Kenworth W990 (12,000 lb. - 14,600 lb. Axles Only)

Fits: 2006-2021 Front Kenworth 365 and 367 (12,000 lb. - 14,600 lb. Axles Only)

Fits: 2006-2021 Front Kenworth 388 and 389 (12,000 lb. - 14,600 lb. Axles Only)

Fits: 2013-2021 Front Kenworth 567 (12,000 lb. - 14,600 lb. Axles Only)

Fits: 2012-2021 Front Kenworth 579 (12,000 lb. - 14,600 lb. Axles Only)

Fits: 2010- 2018 Front Kenworth 587 (12,000 lb. - 14,600 lb. Axles Only)

Fits: 2006-2015 Front Peterbilt: With 4" Wide Leaf Springs Except LCF; 384, 386 

Shipping Notes
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Exchange/Return Notes
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  • Final sale items are not eligible for returns or exchanges.
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SKU: 81234961829

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4.7 ★★★★★
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Andrew
Bozeman, US
★★★★★ 5
Simply put, it’s a miracle product
Style: Restore & Protect, Size: 5 QT, Configuration: 5W-30
There’s a reason this product won the best consumer product of the year, 40,000 customers voted on this product as the most innovative product of the year for car care. Personally it has stopped my 185,000 mile, 16 year old Subaru EJ253 engine from consuming/burning oil in just 2 3,000 mile interval oil changes. I was previously burning about a quart of oil every 1,000 miles before using the Valvoline restore and protect and it has already done its job and then some. Not only have I stopped consuming oil, I’ve seen roughly a +3mpg increase compared to the times I’ve used and tracked MPG while using Shell Rotella T6 and Pennzoil Ultra Platinum; it doesn’t end there either as I regularly check my engine oil dipstick out of habit because the car used to burn oil and I had to stay on top of the oil level. Upon checking my oil level at 1,000 miles into the second oil change I was shocked to see how clean the Valvoline oil was on the sides of the dipstick, using other oils and checking them at that interval has always had my oil looking quite black and dirty just 1000 miles after a change, this was not the case with the restore and protect; it came out at 1000 miles looking very clean, translucent and not discolored. I can’t recommend this product enough, especially at the price point compared to competitors; I will always have a jug of this stuff in the garage.
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Reviewed in the United States on March 31, 2026
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Moosedidit
Los Angeles, US
★★★★★ 5
Incredible motor oil !
Style: Restore & Protect, Size: 5 QT, Configuration: 5W-30
I've used this in my 2014 Buick Encore with 91k miles on it for 2 oil changes and the results are extremely impressive. The engine in the 'ole gal is noticably quieter and my gas milage is definately improving. I switched from Mobil 1 to this oil based primarily on reviews and I'm glad I made the switch. This vehicle is not only my commuter car (80 miles per day), but it's my "winter" vehicle so it sees some temperature extremes. This oil is remarkable ! Time will tell, but I definately recommend it.
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Reviewed in the United States on April 1, 2026
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ARG
Louisville, US
★★★★★ 5
Good! I would buy this again if needed.
Style: Restore & Protect, Size: 5 QT, Configuration: 5W-30
Good! I would buy this again if needed. The best oil to use in a KIA, IMO. Keeps it clean and might help prevent oil burning. Your KIA needs the best oil you can feed it. They are known for failing engines so why not give it the best, especially if its out of warranty like mine!
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Reviewed in the United States on May 26, 2026
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Amazon Customer
Bozeman, US
★★★★★ 5
USE THIS 3 yr old-10yr old cars But it is not for use for classic muscle car-flat tappet cams
Style: Restore & Protect, Size: 5 QT, Configuration: 5W-30
Valvoline has come up with a tested, amazinng engine oil for not the newest cars..but for cars say 3-10 years old that may have some varnish-sludge build up..works slowly enough over time so it doesnt suddently clog the filter, but DO change oil and filter at 3500, not more. In fact 3500 to 4K max for ANY car, any time. DO NOT go longer as some mfg or oil say you can. Tests show that sludge builds up. This oil is NOT for classic muscle cars with flat tappet cams.
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Reviewed in the United States on May 20, 2026
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gillabyte
Pawtucket, US
★★★★★ 5
Amazing Oil!
Style: Restore & Protect, Size: 5 QT, Configuration: 5W-30
So far after first oil change it made my Toyota Tundra 5.7L with 255k miles run smoother and quieted the timing chain tensioner knock that I was quoted $5k and up to repair! Will be using from now on to 500k miles plus!
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Reviewed in the United States on May 14, 2026

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