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Old 09-15-2014, 02:57 PM
Nitebird Nitebird is offline
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Default What size bolts for trans crossmember on 79 TA with 400 4speed?

What size are the trans crossmember bolts for 79 TA with 400 4speed?

And what about the bolts for the center trans mount itself?

I cannot find any of these bolts for my car. Some help would be appreciated. Thanks!

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Old 09-15-2014, 06:57 PM
Skip Fix's Avatar
Skip Fix Skip Fix is offline
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Pretty sure the crossmembers are 3/8 coarse threads.

'79 might have metrics in the tranny mount though.

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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
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1964 Impala SS 409/470ci 600 HP stroker project
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1964 Corvette Coupe 327 4 speed
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Old 09-16-2014, 06:25 AM
Don 79 TA Don 79 TA is offline
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the bolts to the frame you can use what you find
mine are 3/8"-16 (length somewhere around 2" maybe pending washers/etc)
to the trans for the mount, i am not 100% sure, larger is all i know
and they are the same thread pitch for the energy suspension poly mount i am using too
my x-member is a 1 bolt style to the mount

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