120a vs. 94a Alternator

To turn a 63 amp into a 120 amp, you will have to change every single part of the alternator, Including the case.
Sounds like the guy at the shop is trying to pull a fast one...

63 amp Delco is a regular, normal, low performance 10-SI case.
He will have to go to at lest a 12-SI cast to even fit the regulator in...
The 120 amp rotor has longer bearing surfaces, and the 12-SI case has longer bearing gussets to accommodate the bigger bearings required.
The 120 amp rectifier bridge will not fit into the 10-SI case no matter what you do...

If he is using one of the so called, 'Up Grade' kits, the alternator will not last very long, and god help you if you have voltage sensitive electronic equipment on board, like CB radios or stereos...
Those upgrade kits don't control voltage spikes worth a hoot...

If you really want to upgrade, get a 130 or 160 Amp Leese-Neville off of a wrecked big truck.
They aren't much bigger than your current alternator, and is a continuous duty cycle rated, not just surge...

Good luck on what ever you decide...
Aaron.

"I Have The Body Of A God... Buddha"

TR,

First, let me thank you for helping all of us who are electrically illiterate. I'm a wiz at computers and math, but like others on this board, could possibly have an eletrical learing disability.

Since I'll be in the market for a higher output alternator after finals, when I will finally get my Jeep running. I am wondering with the big-rig alternator, if I got one how would I be able to have surge protection. I like the idea of having one of Leese-Neville, weren't they supposto last 300,000 miles or so?

Thanks,

Robert87yj/wwwthreads_images/icons/tongue.gif
engine rebuild w/4.0 head done, now for the MPI

/wwwthreads_images/icons/smile.gif There are probably Leece-Neville alternators out there with a lot more miles than that. I make it a point to "bench" the alternator every 100K...changing the brgs and so forth, and I always do it to MY alternator not get a rebuilt. On our CJ, we are using a GM Delco that came from one of my Olds Diesels...two batteries...glow plugs....A/C....they used the high-output GM alternators./wwwthreads_images/icons/wink.gif

CJDave
Quadra-Trac modified by the crack moonguy/wwwthreads_images/icons/wink.gif/wwwthreads_images/icons/smile.gif/wwwthreads_images/icons/tongue.gif transfer case team.