What The Number Means
8PK1427 is a metric belt designation, not a brand catalog number. The 8 is the rib count. PK is the standard metric V-ribbed profile with 3.56 mm rib spacing. 1427 is the effective length in millimetres. Any belt carrying that designation is dimensionally the same belt, regardless of who moulded it.
On the trucks this belt serves, it drives the accessory pack off the crank — alternator, water pump, and where fitted, the air conditioning compressor. Everything on that circuit depends on the belt holding rib-to-groove contact under load. Lose grip and you lose charging and coolant flow at the same time.
The PartStop part is an aftermarket direct replacement with a reinforced ribbed construction and a heat-resistant rubber compound. It installs in the stock routing with no bracket or pulley changes. We are not affiliated with Volvo, Cummins, or Gates; their numbers appear here for identification only.
Why These Numbers Cross
8PK1427 and GT4080560 describe the same physical belt from two different numbering systems. The metric designation states the geometry outright: eight ribs, PK profile, 1427 mm effective length. Gates uses its own internal sequence — GT4080560 — where the trailing digits encode the same rib count and length in the Gates convention.
Because both numbers resolve to identical rib count, rib pitch, and effective length, a belt built to one specification seats in the same pulley grooves and takes up the same tensioner travel as the other. That is the whole basis of the cross. There is no adapter, no spacer, no re-routing.
What a cross-reference does not tell you is whether your specific truck was built with this belt. Accessory drive layouts change with A/C options, alternator size, and mid-production revisions. Verify by VIN or by reading the designation moulded into the back of the belt you are pulling off.
Inspect Before You Order
Pull the old belt and read the ribbed side. Look for glazing, which shows as a shiny rib face and means the belt has been slipping. Look for chunking or missing rib material, cracks running across the ribs, and any pilling of rubber crumbs in the grooves. More than three or four cracks per inch on a rib means it is done.
A belt that fails early is usually telling you about something else. Check the tensioner for weak spring pressure, a wobbling pulley, or a bearing you can feel roughness in. Sight down the drive for pulley misalignment. Replace an idler or tensioner at the same time if it is suspect — a new belt will not survive a bad one.
8PK1427 Cross-Reference & Interchange Numbers
These manufacturer and aftermarket numbers commonly cross-reference to 8PK1427. Use them to identify the part — then confirm the exact fit by VIN or the number stamped on your old unit before you order. An interchange is a starting point, not a fitment guarantee.
| Brand / Line | Cross-Reference Numbers |
|---|---|
| Gates | GT4080560 |
Frequently asked questions
Is 8PK1427 the same belt as GT4080560?
They cross to the same belt. Both numbers resolve to an eight-rib PK-profile belt with a 1427 mm effective length, so the belt seats identically in the pulley grooves and uses the same tensioner travel. Confirm against the designation moulded on your old belt before ordering.
How do I confirm this belt fits my truck?
Read the number off the back of the belt you are removing — most belts carry the metric designation moulded into the flat side. If it is unreadable, verify the accessory drive configuration by VIN. A cross-reference is a starting point, not a fitment guarantee, because A/C and alternator options change belt length on the same model.
My new belt keeps squealing after install. What's wrong?
Squeal is almost always tension or alignment, not the belt. Check the automatic tensioner for weak spring force and that the arm is not sitting at the end of its travel, which points to a belt that is too long. Then sight the pulleys for misalignment and spin each idler by hand feeling for bearing roughness.
Not sure it fits? We check before you pay.
Run your VIN and we’ll match parts to your exact truck, or call the counter — a person who knows trucks verifies fitment by OEM number before the order ships. No wrong-box returns.
More cross-reference guides
Need the part, not just the reading?
Every part below is a Premium Quality aftermarket Direct Replacement with published OEM cross-reference numbers, a 6+ month warranty and same-business-day shipping from Tacoma, WA. Not sure it fits? Run your VIN — or call and a person who knows trucks will verify fitment before you pay.