96-98 GT 8 rib alternator pulley mod

[Hotrodvdog]

I never got a straight answer from anyone with a Procharger and my year(s) mustang. After installing the BGG spacers on the s/c bracket and grinding the alternator face; BOTH for alternator pulley and s/c pulley clearance it is definitely required to mill the alternator boss down. As you can see in my pics the alternator pulley outer (front) ribs are out by one maybe two ribs. Here are some pics. Hopefully this answers fellow 96-98 GT questions when doing this modification and saves you some belts and your minds. Off to get my pulley milled and I will repost and after pic.


you can see it barely sticks out a little bit

 

[procharged 99]

You can't just put spacers behind the supercharger bracket to push it out some.

 

[Hotrodvdog]

The s/c is already spaced out to align it with the other pulleys. The alternator is the oddball with a pulley sourced from a 5.4 lightning. So no I can't space the blower out anymore because I'd essentially have two pulleys instead of one (alternator) out of alignment.

 

[01yellercobra]

I don't know how solidly the alternator is mounted on the 2V, but I was able to adjust mine to line it up with the blower.

Oh, and it looks like you should have used a single shoulder pulley. Not the double shoulder.

 

[SpittingCobra]

Oh, and it looks like you should have used a single shoulder pulley. Not the double shoulder.

Ditto. Found this out the hard way after I clearanced my alternator and blew off a few good belts. :bash:

 

[Hotrodvdog]

Pics of single shoulder pulley please

 

[Hotrodvdog]

I don't know how solidly the alternator is mounted on the 2V, but I was able to adjust mine to line it up with the blower.

Oh, and it looks like you should have used a single shoulder pulley. Not the double shoulder.

GT alternator is mounted pretty solidly in three areas. The differrences in Cobra and GT alternators are a lot in casing size and how more flush the alternator face is on the Cobra. The GT alterbator face has 6 webbed areas that I had to ground down to allow the pulley boss to sit flush with a machined alternator pulley. It sits perfectly now but I still wonder if the alignment is spot on or not. I'll find out soon enough once I take the engine up to 6k

 

[fastback brian]

the lightning alt use a different pulley, they work on the thin type alt that the cobras, and bullitts use.. the spacing is different than that of the standard 4.6/5.4 alts.. and when I did my 8 rib swap on my bullittt alt I did use a lightning pulley and had to flatten down a small bit of the alt face to clear the 3.9 blower pulley, not by much though,..not sure how much spacer you added but .300-.310 is about right. the belt and pulley should space the same from the block/alt 6 or 8 rib...