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Old 09-15-2009, 12:48 PM
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Mechanical transmisison modulator question

So the older 123 transmissions aren't vac operated and thus have a mechanical modulator. It can be adjusted, but how many turns is too many? I've adjusted it two full turns but the shifts are still softer than I would like. Can I keep going?

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Old 09-15-2009, 01:16 PM
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You have to adjust the length of the control rod where it attaches to the bellcrank on the passenger side of the engine block, under the exhaust manifold. If I remember correctly, lenghtening the rod makes the shifts later and firmer, shortening makes them sooner and softer. Just adjust until you get it the way you want.

If you have mechanic's gloves, you might want to wear them to protect your hands from the hot exhaust.
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Old 09-15-2009, 05:49 PM
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will that help with flare? I have flare on the 77 in all gears, after filter and fluid it has improved, but is still there. Really bad in 2-3
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Old 09-15-2009, 09:12 PM
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Quote:
Originally Posted by blackestate View Post
will that help with flare? I have flare on the 77 in all gears, after filter and fluid it has improved, but is still there. Really bad in 2-3
It helped my flaring some. It didn't go away, but it was pretty bad before. If I accelerate at a moderate speed the shifting is pretty nice. But if I have my foot in it at all it will flare on the 3-4 shift pretty bad. The length of the shift rod off the throttle linkages will also change the shift timing and quality.
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Old 09-16-2009, 12:23 AM
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Quote:
Originally Posted by kingdoc1 View Post
If you have mechanic's gloves, you might want to wear them to protect your hands from the hot exhaust.
I'll definitely second the glove suggestion! I remember this adjustment being pretty frustrating only because I kept burning myself but didn't want to stop until I had the shift points exactly where I wanted them. I suppose it was worth it in the end.

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