#1  
Old 07-13-2020, 10:21 PM
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Default 81 Trans Am rear axle and other

So not new to forum but new to 2nd gen F bodies so couple questions. Got a 81 that has the 1970 Camaro 12 bolt rear and need measurement from left axle flange (outboard) to center of mount on axle tube from an original rear so I can undo what someone did so I can mount the rubber flex hose to a "stock appearing" location. Width of bracket that is welded to axle tube would help also
Second question, was going to bolt the motor mounts to sub frame before I put the control arms back on after painting all parts and .there is a lot of wiggle room on the mounts so do you leave them loose untill motor is in or just eyeball them to "should be good" ? 72 400 motor and mounts appear correct.Motor won't be ready to go in for awhile
Thanks in advance,
Leo

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Old 07-14-2020, 10:05 AM
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Leo the 70 12 bolts use a different brake line flex line that has a bracket that bolts to the rear cover. I fabed a bracket similar to the later models and welded to the 12 bolt on my 79 Camaro to use late hoses. You could probably convert to early hoses if you wanted. I can measure the bracket size and location if you need that to convert it to late model.

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1978 Trans Am original owner 10.99 @ 124 pump gas 455 E heads, NO Bird ever!
1981 Black SE Trans Am stockish 6X 400ci, turbo 301 on a stand
1965 GTO 4 barrel 3 speed project
2004 GTO Pulse Red stock motor computer tune 13.43@103.4
1964 Impala SS 409/470ci 600 HP stroker project
1979 Camaro IAII Edelbrock head 500" 695 HP 10.33@132 3595lbs
  #3  
Old 07-14-2020, 12:02 PM
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That is exactly what I want to do,,eliminate hose at cover and move it to axle tube and use the late hose and lines. Measurement would be awesome.
Thanks Skip Fix

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Old 07-14-2020, 04:27 PM
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There is a slight difference in the location for drum vs 4 wheel discs. There is actually an additional small bracket for the 4WD that bolts to the drum bracket. I can post pictures later tonight of the 12 bolt and then tomorrow get measurements for you

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Skip Fix
1978 Trans Am original owner 10.99 @ 124 pump gas 455 E heads, NO Bird ever!
1981 Black SE Trans Am stockish 6X 400ci, turbo 301 on a stand
1965 GTO 4 barrel 3 speed project
2004 GTO Pulse Red stock motor computer tune 13.43@103.4
1964 Impala SS 409/470ci 600 HP stroker project
1979 Camaro IAII Edelbrock head 500" 695 HP 10.33@132 3595lbs
  #5  
Old 07-14-2020, 08:25 PM
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Thanks ! It's drum brake so no other bracket.
Thanks again !

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  #6  
Old 07-15-2020, 10:12 AM
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Here are the pictures. Just a piece of flat iron a hole with a nut tacked underneath.
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Skip Fix
1978 Trans Am original owner 10.99 @ 124 pump gas 455 E heads, NO Bird ever!
1981 Black SE Trans Am stockish 6X 400ci, turbo 301 on a stand
1965 GTO 4 barrel 3 speed project
2004 GTO Pulse Red stock motor computer tune 13.43@103.4
1964 Impala SS 409/470ci 600 HP stroker project
1979 Camaro IAII Edelbrock head 500" 695 HP 10.33@132 3595lbs
  #7  
Old 07-15-2020, 11:55 PM
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On my stock drum 78 10 bolt center of bracket is 2 3/8" from the cast iron pumpkin where the axle tubes go in. 16 7/8" from the backing plate.

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Skip Fix
1978 Trans Am original owner 10.99 @ 124 pump gas 455 E heads, NO Bird ever!
1981 Black SE Trans Am stockish 6X 400ci, turbo 301 on a stand
1965 GTO 4 barrel 3 speed project
2004 GTO Pulse Red stock motor computer tune 13.43@103.4
1964 Impala SS 409/470ci 600 HP stroker project
1979 Camaro IAII Edelbrock head 500" 695 HP 10.33@132 3595lbs
  #8  
Old 07-16-2020, 09:22 PM
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Thanks for taking the time to post pics and measurements Skip Fix !! Appreciate it. Thanks again !!

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