{"product_id":"gabriel-fleetline-heavy-duty-rear-shock-absorber-85977-durable-ride","title":"Gabriel Fleetline Heavy Duty Rear Shock Absorber 85977 - Durable Ride","description":"\u003cp\u003eIn this review of the Gabriel Fleetline 85977 rear shock absorber, the bottom line is clear: this is a purpose-built heavy duty replacement for Class 8 trucks and Hendrickson HAS suspensions for fleets that need consistent damping and a direct-fit serviceable unit. The reviewer found the single biggest reason to consider these shocks is their application-specific valving and heavy construction that aim to restore ride control on worn suspension systems, making them a practical choice when replacing original equipment on box trucks, delivery rigs, school buses or other commercial vehicles.\u003c\/p\u003e\n\u003ch2\u003eKey Features\u003c\/h2\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eDirect fit for Hendrickson HAS:\u003c\/strong\u003e Designed to match HAS, Series HAS and 40LH suspensions so installation is straightforward on compatible Class 8 applications.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eHeavy duty construction:\u003c\/strong\u003e Chromed piston rods and 360-degree arc-welded end mounts improve corrosion resistance and structural strength for commercial use.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eApplication-specific valving:\u003c\/strong\u003e Tuned valving compensates for worn suspension components and helps deliver predictable handling under heavy loads.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eService dimensions:\u003c\/strong\u003e With a 26.2 in extended length, 15.91 in collapsed length and 10.29 in stroke, the shock meets the dimensional needs of specified Hendrickson and Mc Neilus applications.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eOEM interchangeability:\u003c\/strong\u003e Cross-referenced to multiple OEM numbers for fleet replacement, simplifying part sourcing for maintenance teams.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eBuilt for fleet duty:\u003c\/strong\u003e The FleetLine series targets commercial workloads to extend suspension life in demanding operating conditions.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch2\u003eWho It's For\u003c\/h2\u003e\n\u003cp\u003eThe Gabriel Fleetline 85977 is aimed at fleet maintenance managers, owner-operators and heavy equipment technicians who run Class 8 trucks with Hendrickson HAS or Mc Neilus suspension systems and need a direct-replacement heavy duty shock that restores ride control and reduces driver fatigue. It suits box trucks, RVs, school buses, dump trucks and similar commercial vehicles where durability and correct valving matter.\u003c\/p\u003e\n\u003cp\u003eDrivers seeking a lightweight aftermarket upgrade for passenger cars should look elsewhere, and buyers who require a lifetime-issue guarantee on shocks should carefully weigh reported durability concerns before purchasing multiple units for long-term cost planning.\u003c\/p\u003e\n\u003ch2\u003ePros \u0026amp; Cons\u003c\/h2\u003e\n\u003cp\u003e\u003cstrong\u003ePros\u003c\/strong\u003e\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003eWell-matched valving for worn suspensions delivers improved ride quality and pothole control.\u003c\/li\u003e\n\u003cli\u003eRobust materials like chromed rods and arc-welded mounts increase resistance to corrosion and mechanical damage.\u003c\/li\u003e\n\u003cli\u003eDirect replacement fit and multiple interchange numbers make sourcing and installation easier for fleet shops.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003e\u003cstrong\u003eCons\u003c\/strong\u003e\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003eSome users have reported premature failure and oil leakage on a subset of units, so longevity may vary by duty cycle.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch2\u003eSpecifications\u003c\/h2\u003e\n\u003ctable\u003e\n\u003ctr\u003e\n\u003ctd\u003eVehicle fitment\u003c\/td\u003e\n\u003ctd\u003eHendrickson HAS, Series HAS, 40LH; Mc Neilus Truck \u0026amp; Man Class 8\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eStroke (in)\u003c\/td\u003e\n\u003ctd\u003e10.29\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eExtended length (in)\u003c\/td\u003e\n\u003ctd\u003e26.2\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eCollapsed length (in)\u003c\/td\u003e\n\u003ctd\u003e15.91\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eUpper mount code\u003c\/td\u003e\n\u003ctd\u003eES36\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eLower mount code\u003c\/td\u003e\n\u003ctd\u003eS42\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eInterchange numbers\u003c\/td\u003e\n\u003ctd\u003e598522, 59852-1, 60685-001, 598521, 59852-2, 85977, 5KK247 MTM\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/table\u003e\n\u003ch2\u003eOur Verdict\u003c\/h2\u003e\n\u003cp\u003eThe Gabriel Fleetline 85977 is a sensible, cost-effective replacement for Hendrickson HAS-equipped Class 8 vehicles that need restored ride control and durable components. It delivers good fitment, valving tuned for heavy loads and practical construction for fleet service, but buyers should be mindful of mixed reports about longevity and check warranty or return options when stocking multiple units.\u003c\/p\u003e\n\u003ch2\u003eFrequently Asked Questions\u003c\/h2\u003e\n\u003cp\u003e\u003cstrong\u003eWill this shock fit my Hendrickson HAS suspension?\u003c\/strong\u003e\u003cbr\u003eYes - the 85977 is specified for Hendrickson HAS, Series HAS and 40LH applications when the dimensions and mount codes match your vehicle.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eWhat are the key dimensions to verify before purchase?\u003c\/strong\u003e\u003cbr\u003eConfirm the extended length 26.2 in, collapsed length 15.91 in, stroke 10.29 in, and the upper\/lower mount codes ES36 and S42.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eAre these shocks durable for fleet use?\u003c\/strong\u003e\u003cbr\u003eThey are built for heavy duty service with chromed rods and welded mounts, but some customers have reported premature leaks or failures, so expect real-world variability and check warranty coverage.\u003c\/p\u003e","brand":"Gabriel","offers":[{"title":"Default Title","offer_id":48610739028187,"sku":"B00D8Z9G8G","price":75.78,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0724\/1043\/1707\/files\/51rlXQJn81L._AC_SL1500.jpg?v=1778462537","url":"https:\/\/gearmusthave.com\/products\/gabriel-fleetline-heavy-duty-rear-shock-absorber-85977-durable-ride","provider":"GearMustHave","version":"1.0","type":"link"}