I need a new fan and clutch and as I was searching your part # came up with this thread that has some interesting info and cross references some parts:
I don't see an answer to my questions as to which noise you are
referring to. Engaged, or disengaged?
The GMCMI Part Cross Reference Guide lists the following for the GMC
NAPA TEM 271305 This is a Hayden 2705 Unit
NAPA 271301 This is a Hayden 2797 (Severe Duty) Unit
Hayden clutch fans typically engage at lower ambient air temperatures
than OEM style fan clutches.
The Hayden 2797 engages at 180 deg +/- 10 deg ambient air temps
The Hayden 2705 engages at 175 deg +/- 10 deg ambient air temps
Here are some notes from my presentation.
Aftermarket companies also make replacements. Hayden, Murray, NAPA,
Many of these are made by the same company and are marketed under
different brands. Also, AC Delco outsources some of it’s fan clutches
and Hayden is one of the sources. Torque-Flo (Autozone) fan clutches
are made by Hayden and the HD 2797 Torque-Flo is made in China.
I have not tested the 15-4208/4947 as suggested by Ken B. If this is
your choice, please post any feedback you may have after you install
it and get some miles on it.