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Old 12-02-2018, 09:07 AM   #1 (permalink)
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Transmission mount critique

I'm almost done building a new frame for my '81 CJ7. Got the drive train in now (small block Chevy, SM465 and Dana 300). Decided I would like to build a separate transmission mount from the rest of the skid plate. Since I went with 2x6 tubing for the center part of the frame, everything is up beneath the frame rails, so I can get pretty flat. However, I only have about 1" between the bottom of the frame and the transfer case.

How does this design look for a transmission mount? The bottom part will be 3" (or maybe 4") wide 1/4" plate. It will bolt to the bottom of the frame rail, and run across. I'll have two pieces of 1"x1"x1/8" square tubing on each side to stiffen it up, then a piece of 1/4" plate on top for the transmssion mount (its a poly mount). It will be bolted up with 2 3/8" grade 8 bolts on each side. I machined some weld in nuts that will go in the frame, and have a 1/4" flange, so the cross member will be space 1/4" from the bottom of the frame.

Haven't decided yet how I want to do the rest of the skid plate, but figured this will give me options.


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Old 12-02-2018, 10:32 AM   #2 (permalink)
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Sounds legit. Just make sure there is going to be enough room for your exhaust to get by and you should be good to go.
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Old 12-02-2018, 12:28 PM   #3 (permalink)
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Quote:
Originally Posted by SLOWPOKE693 View Post
Sounds legit. Just make sure there is going to be enough room for your exhaust to get by and you should be good to go.
Thanks, I thought it looked ok. The exhaust was run between the transfer case and the frame rails, so should still fit. Hoping to get this started tomorrow, and mount the body on the frame as well. Then make the last few parts to tie the roll bar into the frame, and then the shock mounts. Then finally take the body off, drive train out, axles off, and paint the frame. This has taken way longer than I thought it would, but its getting there. Just sucks now as I'll have to rent a space heater to paint the frame, ran out of natural heat.
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Old 12-02-2018, 02:31 PM   #4 (permalink)
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It is fine, but consider extending the flat bottom section so you can fold the ends up. This way some of the weight and twisting stress will be taken up by the side rails of the frame. You can sleeve the frame, add inserts to the cross pieces, and through-bolt it in place. Would be a great supplement to the bottoms-up mounting.
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