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#1
10-30-2023, 04:45 PM
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‘70 TA alternator install
I picked up an rebuilt open-faced alternator over the summer and finally got around to trying to install it this weekend. Granted, my 400 RA3 engine is out for a stroker build and am currently running a ‘69 428, but it has all the correct brackets from my ‘70. When I first tried to install it, the bolt ‘ears’ were 180 degrees off, so I clocked it 180 degrees. Then I noticed that the rear bracket (attached to water neck and first manifold bolt) would not line up with the threaded hole in the back. I clocked it another 90 degrees, but now the plug is on the side, not the top, and I don’t think it’s correct.
 Interestingly, the ‘70 Firebird Supplement has a drawing of the alternating that looks just like mine, but I don’t see how to attach the rear bolt with the plug on top of alternator.  Here is the shot of the rear of the alternator (one on left is open-faced)  Sent from my iPhone using Tapatalk
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Three times the sound peaks, falls back, peaks again. A throttling back to cruising speed, a dwindling grumble of thunder and...gone. The frogs take up where they left off. |
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#2
10-30-2023, 05:25 PM
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That’s a early 69 rear case
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#3
10-30-2023, 06:37 PM
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Clock the rear up to 12 O'clock so connector is up top.
This is a 70...
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"The Future Belongs to those who are STILL Willing to get their Hands Dirty" .. my Grandfather |
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#4
10-30-2023, 07:22 PM
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Agree with Telly, you have a 69 rear case. The bolt hole on a 70 rear case is in the same location as the one on the right. Also, the one on the right looks to be clocked correctly.
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1968 Firebird 400HO convertible 1971 Trans Am 4-speed, white/blue |
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#5
10-31-2023, 10:34 AM
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Here’s the one you need
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#6
10-31-2023, 08:52 PM
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Quote:
Thanks Telly. I sent you a PM. Sent from my iPhone using Tapatalk
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Three times the sound peaks, falls back, peaks again. A throttling back to cruising speed, a dwindling grumble of thunder and...gone. The frogs take up where they left off. |
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#7
10-31-2023, 11:44 PM
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1970 back
You got the 69 version. Remember 69 trans am alternator is expensive and I imagine so are the backs. You can sell yours,use it, trade ect. I have a 902 with the 71 style back with correct mounting bolt is another option for you
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#8
10-31-2023, 11:53 PM
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More pics that can help
These are the 70 style only difference I see is the mounting hole is located at 3 o'clock vs 6 o'clock. I learned this stuff hunting down a mystery 1100904 that probably never existed and decided to build 1.
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#9
10-31-2023, 11:59 PM
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More pics that may help
Hear is a service replacement I got and I believe it's correct other than pulley and fan color. Hope my pics helped. I chased down a 1100904 and to this day have never seen one. I was also told that the diamond correct backs aren't that good either and burn out easy and the 71 and new style is better. I'll know more once I start building her up. I'm no expert just trying to.help.
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#10
11-01-2023, 12:41 AM
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A 1969 alternator
Here is some pics of an original 69 open face pontiac trans am alternator. This will probably help you I hope.
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#11
11-13-2023, 04:36 PM
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Thank you! Had a family emergency the last couple of weeks so am just getting back to this issue.
Sent from my iPhone using Tapatalk
__________________
Three times the sound peaks, falls back, peaks again. A throttling back to cruising speed, a dwindling grumble of thunder and...gone. The frogs take up where they left off. |
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#12
11-13-2023, 04:38 PM
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Thanks for the photos and explanation!
Sent from my iPhone using Tapatalk
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Three times the sound peaks, falls back, peaks again. A throttling back to cruising speed, a dwindling grumble of thunder and...gone. The frogs take up where they left off. |
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