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1987 - 1996 F150 & Larger F-Series Trucks 1987 - 1996 Ford F-150, F-250, F-350 and larger pickups - including the 1997 heavy-duty F250/F350+ trucks

88' 300 l6, `2g to 3g alternator conversion

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Old Jun 18, 2021 | 04:28 PM
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From: 94' F-250 460 4x4 e4od
88' 300 l6, `2g to 3g alternator conversion

Attempting to swap the old 60 amp 2g alternator for a 130 amp 3g. I've done this swap before on my 94' big block, but for whatever reason this 2g case seems to be different. One of the ears is offset whereas on any of the 130 amp 3g's I can find the mounting ears are 180 degrees opposed. I am able to locate 95 amp 3g's that would work, but I am not able to find any 130 amps. Anybody know of any 130 amp 3g alternators that have the same offset design?
 
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Old Jun 18, 2021 | 04:45 PM
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On my '92 300 and my '92 302, both alternators had to be re'clocked for the mounting ears to line up. It's really simple. Just remove the 3 screws holding the case together, carefully split it and rotate it whichever direction you need it to be. Been years since I had to do it, so I can't remember offhand what the position should be.
 
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Old Jun 18, 2021 | 04:49 PM
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From: 94' F-250 460 4x4 e4od
Originally Posted by timbersteel
On my '92 300 and my '92 302, both alternators had to be re'clocked for the mounting ears to line up. It's really simple. Just remove the 3 screws holding the case together, carefully split it and rotate it whichever direction you need it to be. Been years since I had to do it, so I can't remember offhand what the position should be.
I'm not referring to the clock position of the plugs as I have to problem reclocking the alternator. Rather I'm referring to the mounting hole positions, as shown here.

 
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Old Jun 18, 2021 | 05:46 PM
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Looks like you can use the bigger alternator with the mounting tabs 180 degrees apart:

The mounting bracket appears to have both sets of holes according to that video. If yours does not then you may have to source a later model year bracket perhaps.
 
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Old Jun 18, 2021 | 05:54 PM
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Ok...yeah, it took me a moment once I saw the pics. My memory is fuzzy and I had to think about the '92 300 alternator swap. I had to change the mounting by repositioning the alternator and changing where the bolt went through. I know what you mean now. I just simply got a different length bolt and used the other hole to to thread the bolt in for the different position.

I wish I hadn't sold the truck. I would shoot a pic of how I mounted it. It's fairly easy and if I remember, I didn't have to grind anything to make it work. I had to remove it a few times for some repairs to other parts of the truck, but it worked easy.

I believe I got a 3G out a '99 Thunderbird or a mercury sable V6 to do the swap. Had $50 in it from the JY, 130 amp.
 
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Old Jun 19, 2021 | 01:46 AM
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From: 94' F-250 460 4x4 e4od
Originally Posted by rla2005
Looks like you can use the bigger alternator with the mounting tabs 180 degrees apart: https://www.youtube.com/watch?v=J6tWt8tIQyw

The mounting bracket appears to have both sets of holes according to that video. If yours does not then you may have to source a later model year bracket perhaps.
I don't know if you watched the video the whole way through because at the end he is only able to get 1/2 mounting points attached (it is possible that the Taurus alternator is bigger than the mustang one I was trying to use but I'll check up on that later on. I will update you
 
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Old Jun 19, 2021 | 08:02 AM
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looks like, he could get shorter belt and it would fit, looking at pic(from video) below, seems to be enough room.

 
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Old Jun 19, 2021 | 03:49 PM
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The video does state the alternator they used is too short for the upper hole. Get the correct case size and the problem should be solved.
 
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Old Jun 19, 2021 | 08:14 PM
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I used an alternator specced for a '95 Mustang when I did mine, and everything lined up just fine on the alternator bracket, on my '87 with a 4.9
 
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