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Old 03-17-2013, 21:09   #1 (permalink)
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'70 3spd shifter assy. rattle

I have a '70 mustang with a 3 speed manual, the kind that shifts the gears with a set of exterior linkages that go to the side of the transmission. The shifter and shifting work fine but at speeds above 50mph I start to get a rattling sound, by 65 mph it's loud enough to prevent conversation between passengers. The sound is almost definitely coming from the shifter assembly but I don't know how easy it is to fix, should I go to the trouble of dropping the tranny to get to the shifter? or do you know an easier way?
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Old 03-17-2013, 22:06   #2 (permalink)
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Re: '70 3spd shifter assy. rattle

It definitely shouldn't rattle like that. Are you sure the u-joints are okay?
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Old 03-17-2013, 22:57   #3 (permalink)
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Re: '70 3spd shifter assy. rattle

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It definitely shouldn't rattle like that. Are you sure the u-joints are okay?
It sounds more like a washer rattling around down there someplace, I can even stop it if I jam the shifter way over to the right so I doubt it's the u-joints.
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Old 03-18-2013, 20:55   #4 (permalink)
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Re: '70 3spd shifter assy. rattle

Can you get it up on a hoist or 4 stands and run it? Maybe you could be under it to pin point the rattle.
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Old 03-19-2013, 18:43   #5 (permalink)
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Re: '70 3spd shifter assy. rattle

Your shifter forks may be coming loose. If you don't have any slop in the linkage, your problem is probably there.
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Old 03-19-2013, 18:57   #6 (permalink)
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Re: '70 3spd shifter assy. rattle

Apparently it's cured by fitting wavy washers to linkage .

" The "wave washer" (sometimes referred to as a bellville washer) is placed on the linkage stud end just before the flat washer. It is the # 351467-S in the attached diagrams.
Sorry, but I forgot to mention that yes, the wave washer puts a spring like tension on the shifting linkage when attached to the shift levers (at both the transmission and shifter) to prevent the linkage from "rattling" around.

Install all 6 wave washers and the rattling noise you hear should disappear."
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Old 03-19-2013, 22:09   #7 (permalink)
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Re: '70 3spd shifter assy. rattle

I'll keep working on it, but there's almost no slop in the shift linkages, all the wave washers are there, I threw an extra couple flat washers in there to tighten things up anyways so we'll see what happens...
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