What You're Actually Buying
This is a single-piece serpentine belt, EPDM rubber compound with 8 ribs, running your alternator, water pump, power steering pump and A/C compressor off one pulley system. Length code 1295 means 1295mm circumference — that number has to match your old belt almost exactly or you'll be fighting tension the whole life of the belt.
GT4080510 is the aftermarket house number here, but the belt underneath is the same physical spec sold as 815.408051, 5080510, and 4080510 depending who boxed it. Rubber doesn't care what sticker's on the package — 8 ribs, 1295mm is 8 ribs, 1295mm.
Why These Numbers Cross and What to Check Before You Order
Dayco 5080510 and Goodyear 4080510 are the same belt spec sold under their own part numbering, and Alliance N01 8K510 is that same 8-rib/1295mm belt using Alliance's own code format (8K = 8 rib, 510 = length shorthand). Different suffixes, same physical belt geometry. That's normal in the belt world — manufacturers just format their part numbers differently.
Where guys get burned isn't rib count, it's length. A belt that's 10-15mm off in either direction will either ride the pulley edges wrong or won't tension up right on a auto-tensioner, and you'll be back here in two weeks with the same squeal. Rib count mismatches are rare but check that too — an 8-rib belt on a 6 or 7-rib pulley set will chew itself up fast.
Surest way to confirm: pull the old belt off, read the number stamped on the backside, or just measure rib count and total length with a tape around the pulley path. If you've got the unit number or VIN, we can run it and tell you what the spec sheet calls for before you buy.
Ordering From PartStop
We stock this one in Tacoma, so if you're local and your truck's sitting with a dead accessory drive, call ahead and we'll have it at the counter same day. Fleet accounts move a lot of these — they're not exotic, just a normal wear item that fails on a schedule.
Ship nationwide if you're not local, and it comes with the standard 6+ month warranty on the belt itself. Just confirm your length spec against the old part or your VIN before it ships — belts are cheap, but a wrong-length belt sitting on a truck three states away doing you no good.
GT4080510 Cross-Reference & Interchange Numbers
These manufacturer and aftermarket numbers commonly cross-reference to GT4080510. 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 |
|---|---|
| Alliance | N01 8K510 |
| Dayco | 5080510 |
| Goodyear | 4080510 |
Frequently asked questions
Does GT4080510 fit my truck?
Depends what's turning your accessory drive. This is an 8-rib, 1295mm serpentine belt — common on a range of medium and heavy-duty applications, but you need to confirm by VIN or by matching the number off your old belt before ordering. Don't go by engine size alone, different accessory configurations on the same engine can run different belt lengths.
Is this the same as the Dayco 5080510?
Same belt spec — 8 rib, 1295mm — just packaged under Dayco's own numbering. Functionally it's the same physical part, but always double check the number stamped on your old belt or your VIN to be sure your application calls for this exact length and rib count before swapping.
How do I know if it's the belt or the tensioner causing my noise?
Chirping or squealing that comes and goes with RPM or when it's wet out is usually the belt — glazing, cracking, or slight length mismatch. A constant rattle or noise that changes when you flex the tensioner arm by hand (engine off) points to the tensioner or an idler pulley. Worth checking both while you're in there since a bad tensioner will chew up a brand new belt in short order.
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.