{"product_id":"donaldson-p550222-transmission-filter-kit","title":"Donaldson P550222 Transmission Filter Kit","description":"\u003ch2\u003eTransmission Filter Kit Overview\u003c\/h2\u003e\u003cp\u003eDonaldson P550222 is a spin-on transmission filter kit built for hydraulic filter applications in heavy-duty trucks and vocational equipment. It uses cellulose media, an anti-drainback valve, and a bypass valve to support consistent fluid flow in demanding service conditions.\u003c\/p\u003e\u003cp\u003eCompatible with applications on Freightliner Cascadia, Kenworth T680, and Peterbilt 579 models, this filter kit is specified for a wide range of Allison-based hydraulic filter uses. The Donaldson P550222 part number is also commonly referenced in cross-application service searches for the same type of filter.\u003c\/p\u003e\u003ch2\u003eKey Features\u003c\/h2\u003e\u003cul\u003e\n\u003cli\u003eSpin-on style for straightforward filter replacement.\u003c\/li\u003e\n\u003cli\u003eCellulose media for standard filtration performance.\u003c\/li\u003e\n\u003cli\u003eAnti-drainback valve helps retain fluid in the filter after shutdown.\u003c\/li\u003e\n\u003cli\u003eBypass valve included with 0.7 HR and 0.5 LR settings.\u003c\/li\u003e\n\u003cli\u003eSAE J1858 efficiency testing standard.\u003c\/li\u003e\n\u003cli\u003e3\/4-16 UN thread size with 3.66-inch outer diameter.\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch2\u003eDetailed Product Description\u003c\/h2\u003e\u003cp\u003eDonaldson P550222 is engineered as a hydraulic transmission filter for heavy-duty truck platforms that use a spin-on filter design. The filter measures 136.2 in length, uses cellulose filter media, and includes a bypass valve plus anti-drainback valve to support fluid control during service intervals. The gasket dimensions are 2.44 ID and 2.83 OD, and the unit is built around a 3\/4-16 UN thread specification. For buyers searching by part number, P550222 is a direct reference for this Donaldson transmission filter kit.\u003c\/p\u003e\u003cp\u003eFitment coverage includes Freightliner Cascadia, M2 112, Columbia, and 114SD; Kenworth T680, T880, T660, T800, T2000, T600A, K100E, C500, T400, T450, and T300; Peterbilt 579, 367, 365, 384, 386, 387, 388, 389, 357, 378, 379, 385, and 377; plus International 9900i, ProStar, 9900i SFA, 9900ix, and 9900ix SFA, along with Mack CL and Volvo VNL 430 and VNL 630 applications. Use the Donaldson P550222 part number to confirm the correct service filter for your truck before ordering.\u003c\/p\u003e\u003ch2\u003eCommon Service Issues Addressed\u003c\/h2\u003e\u003cul\u003e\n\u003cli\u003eRestricted hydraulic flow from a loaded or contaminated filter.\u003c\/li\u003e\n\u003cli\u003eFluid drain-back after shutdown that can delay pressure recovery.\u003c\/li\u003e\n\u003cli\u003eBypass activation caused by filter loading over time.\u003c\/li\u003e\n\u003cli\u003eService replacement needs for spin-on hydraulic filter applications.\u003c\/li\u003e\n\u003cli\u003eFitment matching for Allison 25010543 cross-reference service.\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch2\u003eInstallation Notes and Tips\u003c\/h2\u003e\u003cp\u003eVerify the thread size, gasket dimensions, and application reference before installation. Replace the filter during scheduled service intervals and inspect the sealing surface for debris or damage before spinning the new unit into place. Confirm the vehicle’s hydraulic filter specification against the part number P550222 and the listed application notes.\u003c\/p\u003e\u003ch2\u003eQuality Assurance\u003c\/h2\u003e\u003cp\u003eDonaldson is a recognized filtration brand in heavy-duty service applications, and this filter is built to SAE J1858 efficiency testing standards. This part cross-references Monroe Shocks \u0026amp; Struts (e.g., 172286, 182286) for the same application.\u003c\/p\u003e","brand":"Donaldson","offers":[{"title":"Default Title","offer_id":53609655500981,"sku":"BBNQ-P550222","price":43.12,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0628\/1442\/1173\/files\/VF_P550222_Fro.jpg?v=1793078804","url":"https:\/\/www.partcatalog.com\/products\/donaldson-p550222-transmission-filter-kit","provider":"PartCatalog","version":"1.0","type":"link"}