[db4767]

Do you still need a shot of the rear alt. bracket ? Just removed one sat. to replace thermostat and housing . Waiting on new housing , is that an SD only bracket ?

[takid455]

yes, I still need a picture of it. I have an idea of what it looks like , but want to verify. I do not think it is SD only. the parts books do not mention anything about SD, HO ect. I believe it has to do with alt size (amps). My book says the number should be 496663. not sure if this is the right one as several were offered.

[db4767]

I will try to get a pic tomorrow night and post . It is a 74 air car with power windows etc. so I guess it would have the big alt. By the way white with blue lettering no hood bird from factory (has one now ) and red int. with rear console , SD, M40 & 3.08 rear .

[johnta1]

takid455, if it doesn't have AC, I don't think that alternator is correct.

[superdutybob]

The 55A alternator is correct for your car if it has A/C and does NOT have either power windows or electric rear defroster. If you have either of those with A/C you would have the 80A alternator which mounts differently.

The PN you show is correct for the 74 55A alternator. When was your car built? There is a new PN alternator that was used late in the production year. I believe the 55A version ends in 428

[takid455]

Originally Posted by superdutybob

The 55A alternator is correct for your car if it has A/C and does NOT have either power windows or electric rear defroster. If you have either of those with A/C you would have the 80A alternator which mounts differently.

The PN you show is correct for the 74 55A alternator. When was your car built? There is a new PN alternator that was used late in the production year. I believe the 55A version ends in 428

I do not have a/c or p/w. I do have a ref def. my car was built 6/74. if this is not the 'correct' alt, what would be the 'correct' one and would it require a rear alt bracket?

thanks DB4767 for the pictures.

[toomanybirds]

Originally Posted by takid455

I do not have a/c or p/w. I do have a ref def. my car was built 6/74. if this is not the 'correct' alt, what would be the 'correct' one and would it require a rear alt bracket?

thanks DB4767 for the pictures.

If "ref def." means you have rear defrost (heating wires in the back window) then the 55 amp alternator is correct.

The alternator bracket pictured in the post by DB4767 is correct.

[formula kid]

takid455 all 74 pontiac's have the bracket that was pictured. Pontiac would never send a gen out that only had one mounting point due to torque placed on front bracket alone. The chance on throwing belts and part breakage would make the Dealers go nuts.

[db4767]

here are pix of the rear alt. bracket .