Re: th350 modulator
It's actually a paint stripe around the vacuum can on the modulator. I believe factory was black stripe, non-adjustable. The red (green?) are adjustable. This way you can fine tune your shift points.
I did see on O'Reillys sight, the adjustable green stripe.
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'86 C-30 dually, 454/tbh400
'73 K-20 350/350/205 (sold  )
I'm kinda like duct tape- no real purpose, but handy to have around.
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