Which fan clutch should I use ?

[69moredoor]

A friend had these parts laying around. My 79 d100 (318) has the direct drive fan. I wanted to switch to a clutch fan. He gave me these. The right fan and clutch is off of an 86 w250 318. The left clutch he couldn’t remember. Any idea what the differences are (other than diameter) and which one would be best to use?
Thanks

 

[George Jets]

Here is what Rock Auto shows for a 1979 D100 318 fan clutch.
About 25.00 bucks plus ship.

Want to make sure your used fan clutches are not wore out.

 

[69moredoor]

Here is what Rock Auto shows for a 1979 D100 318 fan clutch.
About 25.00 bucks plus ship.

Want to make sure your used fan clutches are not wore out.

View attachment 1715920719[/QUOTE

yeah. I’ll just get a new one. Is my guess correct the the larger is the louder but heavy duty one?

 

[lemondana]

The heavy duty are the loud ones, but that is what I would recommend.

 

[oldkimmer]

It’s the fan blades that make the noise. Kim