crankshaft extension pulleys

[autolance2]

Does anyone have the GM part numbers for any of the crankshaft extension pulleys? These are the 3rd pulleys which are added to the double groove crank pulleys for a/c.

 

[Gerry]

crankshaft pulley.

I have A/C and P/S on my 67 Suburban w/409. The part # for the third pulley is 3744043. It was purchased several years ago, may not be a good # today.

 

[autolance2]

crank ext. pulleys

To anyone reading this, I found out that the 67-68 z-28 302 uses the same 2-groove crank pulley as the 409. Ext. pulley number is 3916385.