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Old 04-13-2015, 11:14 AM   #1 (permalink)
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Bushing span distance question

I'm figuring out tranny mounting options on my tube chassis crawler. The easiest mount option is a 10" bushing span. The sleeve would be a 5/8 ID, 1/8 wall, and 7/8 OD. I would use a 5/8 threaded rod and .120 wall 1 3/4 DOM on the outside.

Think this is to long of a span?
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Old 04-13-2015, 11:21 AM   #2 (permalink)
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Old 04-13-2015, 11:27 AM   #3 (permalink)
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I don't quite understand but that span looks fine to me.

I wouldn't use threaded rod though. If you can get a hardened bolt that's long enough, maybe 2 short bushings and 2 bolts instead of that one long one?
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Old 04-13-2015, 11:54 AM   #4 (permalink)
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I have done an 8" span for a tranny mount and it worked fine, that was 4 years ago and haven't heard of any problems from the guy.
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Old 04-13-2015, 12:39 PM   #5 (permalink)
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I cut the flanges off bushings to span the gap between so there is no way for the bushings to pinch and pull into the tube, I also did one that I welded a washer onto the inner sleeve to serve the same purpose. Dosent make me comfortable thinking that it could pull in.
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Old 04-13-2015, 04:46 PM   #6 (permalink)
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Why not use 2 sets of bushings? One at each end of your 10" tube, turned 90* from the way you have it planned. You would then have two shorter bolts and no questions on the bushing span.
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Old 04-13-2015, 05:06 PM   #7 (permalink)
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The span is isn't that crucial. Wider has better leverage but sometimes it's too much depending on the rest of the mounts. Motor and trans mounts need to breath together without one taking all the torque.

Whatever the span is, the bolt needs to be accessed. If it's a 10" span, the mounting bolt needs to be pulled through without hitting frame rails etc.

Sometimes it's better to work with what hardware is available. A 10" span means a 11-12 inch bolt. Get the bolt first and make everything around it.

I don't recommend using all-thread.
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Old 04-13-2015, 06:19 PM   #8 (permalink)
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Could you make a new inner steel sleeve that's threaded on both sides and use 2 short bolts on either side? Just a thought.
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Old 04-13-2015, 08:02 PM   #9 (permalink)
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You can get hardened all thread, as long as you use a inner sleeve as planned it'll be fine.

We use all thread all the time on production machines.
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Old 04-13-2015, 08:38 PM   #10 (permalink)
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Jr brings up a good point. My trans mount bushings are the same width apart as my motor mounts. If possible, they should be the same or the narrower if the two will do most the work, and promote flex throughout the drivetrain. People get away with different size mounts all the time, but it doesn't make it right.
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