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3gs.jpg 3G Alternators are easily distinguishable by the vent holes between each pair of front ribs.  95A models have 4 holes; 130A models have a larger case diameter and 2 larger holes.

[url=https://www.supermotors.net/registry/media/1031634][img]https://www.supermotors.net/getfile/1031634/thumbnail/50alt3g.jpg[/img][/url] . [url=https://www.supermotors.net/registry/media/556246][img]https://www.supermotors.net/getfile/556246/thumbnail/altsidemount.jpg[/img][/url] . [url=https://www.supermotors.net/registry/media/144060][img]https://www.supermotors.net/getfile/144060/thumbnail/alternator-130a.jpg[/img][/url] . [url=https://www.supermotors.net/registry/media/843907][img]https://www.supermotors.net/getfile/843907/thumbnail/alternator3gvr.jpg[/img][/url] . [url=https://www.supermotors.net/registry/media/723349][img]https://www.supermotors.net/getfile/723349/thumbnail/alternator-130a.jpg[/img][/url]

The alt. on the Left has the small-case narrow-spread front-mount front casehalf used on many early applications, including '93-96 4.9Ls; the Right one has the large-case 3-bolt front casehalf used on many smallblock V8s & diesels, and others.  There are at least 3 other mounting bolt configurations for each size of case.  The rear casehalf is always the same for each of the 2 sizes, but some have an additional mounting bolt boss.

Various applications will have the rear case clocked differently, so if your wiring doesn't reach, FIRST loosen the front nut and take the pulley off.  Then remove the 3 case bolts, flip it, lift the front case while pushing the shaft into the rear case slightly, rotate the front, set it down, and reassemble it.  If the shaft (armature) slides out of the rear case, the brushes will shoot out behind the commutator.  Simply remove the voltage regulator, push the brushes back in, pin them with a paperclip or toothpick, finish assembling the alternator, reinstall the VR, and remove the pin.

Be sure to clean the case mounting points on the alt. & the engine, the alt. output stud, & the battery terminals to get an alternator's best performance:

[url=https://www.supermotors.net/registry/media/1055207][img]https://www.supermotors.net/getfile/1055207/thumbnail/06bracket02.jpg[/img][/url] . [url=https://www.supermotors.net/registry/media/1055206][img]https://www.supermotors.net/getfile/1055206/thumbnail/06bracket01.jpg[/img][/url] . [url=https://www.supermotors.net/registry/media/825495][img]https://www.supermotors.net/getfile/825495/thumbnail/cont6.jpg[/img][/url] . [url=https://www.supermotors.net/registry/media/825375][img]https://www.supermotors.net/getfile/825375/thumbnail/alternatormountboss.jpg[/img][/url] . [url=https://www.supermotors.net/registry/2742/69178-4][img]https://www.supermotors.net/getfile/723279/thumbnail/07done.jpg[/img][/url]

There is no advantage to the 95A over the 130A in any application.  A vehicle that came with a 95A (or ANY lower-output alt) will work at least as well with a 130A.  But there is a huge advantage to any 3G (including the 95A) over any older-generation alternator; particularly the 2G, which is known to catch fire.
3gs.jpg | Hits: 1440 | Posted on: 2/15/16 | View original size (625.8 KB)

3G Alternators are easily distinguishable by the vent holes between each pair of front ribs. 95A models have 4 holes; 130A models have a larger case diameter and 2 larger holes.

. . . .

The alt. on the Left has the small-case narrow-spread front-mount front casehalf used on many early applications, including '93-96 4.9Ls; the Right one has the large-case 3-bolt front casehalf used on many smallblock V8s & diesels, and others. There are at least 3 other mounting bolt configurations for each size of case. The rear casehalf is always the same for each of the 2 sizes, but some have an additional mounting bolt boss.

Various applications will have the rear case clocked differently, so if your wiring doesn't reach, FIRST loosen the front nut and take the pulley off. Then remove the 3 case bolts, flip it, lift the front case while pushing the shaft into the rear case slightly, rotate the front, set it down, and reassemble it. If the shaft (armature) slides out of the rear case, the brushes will shoot out behind the commutator. Simply remove the voltage regulator, push the brushes back in, pin them with a paperclip or toothpick, finish assembling the alternator, reinstall the VR, and remove the pin.

Be sure to clean the case mounting points on the alt. & the engine, the alt. output stud, & the battery terminals to get an alternator's best performance:

. . . .

There is no advantage to the 95A over the 130A in any application. A vehicle that came with a 95A (or ANY lower-output alt) will work at least as well with a 130A. But there is a huge advantage to any 3G (including the 95A) over any older-generation alternator; particularly the 2G, which is known to catch fire.
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