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Trans crossmember - something missing

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Old Oct 20, 2017 | 02:49 PM
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Default Trans crossmember - something missing

I just put my eng and 700r4 back in my '80 and the '82 cross member doesn't reach the trans mount. Is there a plate that goes between the trans and cross member? The orig '80 cross member is on the floor inline with the frame mounts. It won't work either.

What at am I missing?
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Old Oct 20, 2017 | 03:00 PM
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The TH700R4's used in the '82 had the mount bolted onto the tail housing and that's why your TH700R4 doesn't reach. You'll have buy a tail housing with the mount pad or make a plate that bolts to your transmission case that extends back to the cross member and I seem to recall the bolt holes need to be spaced 4-1/2" apart.
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Old Oct 20, 2017 | 07:59 PM
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I made a plate. It's 1/2" thick x 8" x 4". The hole spacing at each end is 1 1/2". Not sure what the spacing is between the transmission mount holes and the crossmember holes since I held it in place and marked it for drilling.


I did make sure the 4 holes are inline/square with each other since one of the crossmember's jobs is drivetrain alignment. I've got both engine mount bolts in but I believe the rear of the transmission is closer to the passenger side than it should be. The plate will line it up.
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Old Oct 21, 2017 | 08:27 AM
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Originally Posted by 71VetteLover
The TH700R4's used in the '82 had the mount bolted onto the tail housing and that's why your TH700R4 doesn't reach. You'll have buy a tail housing with the mount pad or make a plate that bolts to your transmission case that extends back to the cross member and I seem to recall the bolt holes need to be spaced 4-1/2" apart.
Got it - thank you very much
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