{"product_id":"48-50005-01-drive-gear-coupling-kit-yellow-oil-filled-nylon-carrier-transicold-x4","title":"48-50005-01 Drive Gear Coupling Kit — Yellow Oil-Filled Nylon | Carrier Transicold X4","description":"\u003ch3 dir=\"ltr\" class=\"text-text-100 mt-2 -mb-1 text-base font-bold\" data-sourcepos=\"52:1-52:53;1441-1493\"\u003eStill running the blue gear? That's the old one.\u003c\/h3\u003e\n\u003cp class=\"font-claude-response-body break-words whitespace-normal\" dir=\"ltr\" data-sourcepos=\"54:1-54:165;1495-1659\"\u003eCarrier moved from the blue \u003cstrong\u003e48-50005-00\u003c\/strong\u003e to the yellow \u003cstrong\u003e48-50005-01\u003c\/strong\u003e. Same fit, same 6-bolt pattern, different material — and the material is the entire point.\u003c\/p\u003e\n\u003chr class=\"border-border-200 border-t-0.5 my-3 mx-1.5\"\u003e\n\u003ch3 dir=\"ltr\" class=\"text-text-100 mt-2 -mb-1 text-base font-bold\" data-sourcepos=\"58:1-58:39;1666-1704\"\u003eWhat actually kills these couplers\u003c\/h3\u003e\n\u003cp class=\"font-claude-response-body break-words whitespace-normal\" dir=\"ltr\" data-sourcepos=\"60:1-60:61;1706-1766\"\u003eMost people assume the gear snaps. It doesn't. It \u003cstrong\u003ecooks\u003c\/strong\u003e.\u003c\/p\u003e\n\u003cp class=\"font-claude-response-body break-words whitespace-normal\" dir=\"ltr\" data-sourcepos=\"62:1-62:300;1768-2067\"\u003eDry nylon has high friction at the tooth face. Every torque pulse from the diesel scrubs the teeth against the hub, and that friction becomes heat with nowhere to go. Nylon softens as it heats. Soft teeth deform under load. Deformed teeth concentrate stress onto a smaller and smaller contact patch.\u003c\/p\u003e\n\u003cp class=\"font-claude-response-body break-words whitespace-normal\" dir=\"ltr\" data-sourcepos=\"64:1-64:48;2069-2116\"\u003eThen one pulse too many, and a tooth walks out.\u003c\/p\u003e\n\u003cp class=\"font-claude-response-body break-words whitespace-normal\" dir=\"ltr\" data-sourcepos=\"66:1-66:91;2118-2208\"\u003eAdd misalignment and it accelerates — now two teeth carry what six were designed to share.\u003c\/p\u003e\n\u003chr class=\"border-border-200 border-t-0.5 my-3 mx-1.5\"\u003e\n\u003ch3 dir=\"ltr\" class=\"text-text-100 mt-2 -mb-1 text-base font-bold\" data-sourcepos=\"70:1-70:42;2215-2256\"\u003eWhat the yellow gear does differently\u003c\/h3\u003e\n\u003cp class=\"font-claude-response-body break-words whitespace-normal\" dir=\"ltr\" data-sourcepos=\"72:1-72:189;2258-2446\"\u003e\u003cstrong\u003eInternal lubrication.\u003c\/strong\u003e The oil is \u003cem\u003ein\u003c\/em\u003e the material, not on it. It doesn't wash out, wipe off, or run dry. Lower friction at the tooth face means less heat generated in the first place.\u003c\/p\u003e\n\u003cp class=\"font-claude-response-body break-words whitespace-normal\" dir=\"ltr\" data-sourcepos=\"74:1-74:180;2448-2627\"\u003e\u003cstrong\u003eHigher elongation.\u003c\/strong\u003e More stretch before failure means the coupler works as a damper. Torque spikes get absorbed and returned instead of transmitted straight through as a crack.\u003c\/p\u003e\n\u003cp class=\"font-claude-response-body break-words whitespace-normal\" dir=\"ltr\" data-sourcepos=\"76:1-76:171;2629-2799\"\u003e\u003cstrong\u003eBalanced stiffness.\u003c\/strong\u003e Rigid enough to hold precise tooth geometry under load. Compliant enough to tolerate the misalignment that exists on every unit in the real world.\u003c\/p\u003e\n\u003cblockquote class=\"ml-2 border-l-4 border-[hsl(var(--border-300)\/0.1)] pl-4 text-text-300\" data-sourcepos=\"78:1-78:187;2801-2987\"\u003e\n\u003cp class=\"font-claude-response-body break-words whitespace-normal\" dir=\"ltr\" data-sourcepos=\"78:3-78:187;2803-2987\"\u003eStrength alone doesn't win here. A rigid, high-strength gear transmits every shock straight into its own teeth. The one that survives is the one that absorbs abuse without overheating.\u003c\/p\u003e\n\u003c\/blockquote\u003e\n\u003chr class=\"border-border-200 border-t-0.5 my-3 mx-1.5\"\u003e\n\u003ch3 dir=\"ltr\" class=\"text-text-100 mt-2 -mb-1 text-base font-bold\" data-sourcepos=\"82:1-82:12;2994-3005\"\u003eFitment\u003c\/h3\u003e\n\u003cp class=\"font-claude-response-body break-words whitespace-normal\" dir=\"ltr\" data-sourcepos=\"84:1-84:32;3007-3038\"\u003e\u003cstrong\u003ePrimary — current X4 fleet:\u003c\/strong\u003e\u003c\/p\u003e\n\u003ch3 dir=\"ltr\" class=\"text-text-100 mt-2 -mb-1 text-base font-bold\" data-sourcepos=\"85:1-85:32;3039-3070\"\u003eX4 7700 · X4 7500 · X4 7300\u003c\/h3\u003e\n\u003cp class=\"font-claude-response-body break-words whitespace-normal\" dir=\"ltr\" data-sourcepos=\"87:1-88:117;3072-3203\"\u003e\u003cstrong\u003eAlso fits:\u003c\/strong\u003e X4 6600 MT · Ultima XTC · ULTRA XL \/ XTC \/ XT \/ ULTRA · Europhoenix · X2 1800 \/ 2100 \/ 2100A \/ 2100R \/ 2500A \/ 2500R\u003c\/p\u003e\n\u003cp class=\"font-claude-response-body break-words whitespace-normal\" dir=\"ltr\" data-sourcepos=\"90:1-90:231;3205-3435\"\u003eIf you're running an \u003cstrong\u003eX4 7700, 7500, or 7300\u003c\/strong\u003e, this is your gear. The older Ultima, ULTRA, and X2 units are still covered — those are aging out of most fleets, but if you've still got them on the yard, the same coupler drops in.\u003c\/p\u003e\n\u003cp class=\"font-claude-response-body break-words whitespace-normal\" dir=\"ltr\" data-sourcepos=\"92:1-92:73;3437-3509\"\u003e\u003cstrong\u003eCross-references:\u003c\/strong\u003e 48-50005-01 · 48-50005-00 · 485000501 · 48-5000501\u003c\/p\u003e\n\u003chr class=\"border-border-200 border-t-0.5 my-3 mx-1.5\"\u003e\n\u003ch3 dir=\"ltr\" class=\"text-text-100 mt-2 -mb-1 text-base font-bold\" data-sourcepos=\"96:1-96:22;3516-3537\"\u003eWhat's in the box\u003c\/h3\u003e\n\u003cul dir=\"ltr\" class=\"[li_\u0026amp;]:mb-0 [li_\u0026amp;]:mt-1 [li_\u0026amp;]:gap-1 [\u0026amp;:not(:last-child)_ul]:pb-1 [\u0026amp;:not(:last-child)_ol]:pb-1 list-disc flex flex-col gap-1 pl-8 mb-3 print:block print:space-y-1\" data-sourcepos=\"98:1-99:31;3539-3606\"\u003e\n\u003cli class=\"font-claude-response-body whitespace-normal break-words pl-2\" data-sourcepos=\"98:1-98:37;3539-3575\"\u003eYellow oil-filled nylon drive gear\u003c\/li\u003e\n\u003cli class=\"font-claude-response-body whitespace-normal break-words pl-2\" data-sourcepos=\"99:1-99:31;3576-3606\"\u003eComplete 6-bolt hardware set\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003chr class=\"border-border-200 border-t-0.5 my-3 mx-1.5\"\u003e\n\u003ch3 dir=\"ltr\" class=\"text-text-100 mt-2 -mb-1 text-base font-bold\" data-sourcepos=\"103:1-103:23;3613-3635\"\u003eBefore you install\u003c\/h3\u003e\n\u003cp class=\"font-claude-response-body break-words whitespace-normal\" dir=\"ltr\" data-sourcepos=\"105:1-105:204;3637-3840\"\u003eCheck your engine and compressor mount alignment first. A new gear in a misaligned drive is a new gear with a short life. This coupler tolerates misalignment better than the old one — it doesn't cure it.\u003c\/p\u003e","brand":"AVRO Parts","offers":[{"title":"Default Title","offer_id":48862999052388,"sku":null,"price":169.99,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0638\/5303\/5620\/files\/ChatGPTImageJul27_2026_08_16_01AM.png?v=1785177811","url":"https:\/\/www.avroparts.com\/products\/48-50005-01-drive-gear-coupling-kit-yellow-oil-filled-nylon-carrier-transicold-x4","provider":"AVRO Parts","version":"1.0","type":"link"}