I have a spare fifth gen alternator and one of my fourth gens (99 I30) needs an alternator, the spare is from a 2001.

my concern is, i know the body and amps are the same mostly, but are the pulleys the same?

thanks!

 

yes

 

Yezzir. They are the same and will be a direct bolt up.

 

I hear they're good for about .0001hp increase when used with super unleaded fuel.

 

Lol. Yeah ill enjoy my .000001 hp

Anyways they are identical i couldn't figure out why they used different part numbers for the same thing.

 

Sorry for the old bump but will a 5.5gen alternator be a direct bolt on for a 4th gen?

 

Yes. All 5th gen years will fit the 4th gen.

 

I put 5.5 gen alternator in my 5th gen, so I don't see why not.