04 Avalanche 163k miles, decided to replace them as I do not know how old the previous parts were. The old acc belt was a Continental, the serp belt was a Dayco therefore they were not original. Tensioners also don’t look original. I replaced them w new Gates. Install went well except the serp belt was difficult / tight fit. While I had the splash guard off, I went ahead i greased all 11 fittings on the suspension.
New belts, tensioners, and pulley
- Thread starter barkingspider
- Start date
Good job. You might want to check the A/C belt. Correct me if I’m wrong but it on the passenger side down low and has a separate belt. You can get in from underneath.
105 amp alternator equipped trucks take a GM# 12576450 (6PK2345), Gates K060923 (6PK2346) is the correct replacement.
140/145 amp alternator equipped trucks take a GM# 12576451 (6PK2365), Gates K060930 (6PK2365) is the correct replacement.
Catalogs have always been inconsistent with this, Most Avalanches came with a 140/145 amp alternator, So that's likely why the 6PK2346 is a real tight fit.
That AC Belt Tensioner looks to be original as it has a 2003 year code "3" on it.
140/145 amp alternator equipped trucks take a GM# 12576451 (6PK2365), Gates K060930 (6PK2365) is the correct replacement.
Catalogs have always been inconsistent with this, Most Avalanches came with a 140/145 amp alternator, So that's likely why the 6PK2346 is a real tight fit.
That AC Belt Tensioner looks to be original as it has a 2003 year code "3" on it.
The old belts are worn out. Grooves are huge
Thanks for the heads up. I replaced the belt w the correct 145amp Gates belt this morning.
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