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Old 05-14-2016, 03:40 PM   #1
82GMC3500
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Transmission issue

I think I have a tranny issue. Started shifting at 3000 rpms,,, used to shift earlier but never payed attention to exactly when. 1982 GMC with a hydromatic 350 tranny. Any advise appreciated.
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Old 05-15-2016, 09:04 AM   #2
D13
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Re: Transmission issue

First stop, check the vacuum line to the modulator, attached and crack free.
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1987 2 ton
1982 250/TH350 beater in progress
Dad's 1981 3/4 L6 3 on tree posi and no options, awaiting restoration or scrapping
Plus a mess o' tractors
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Old 05-15-2016, 09:25 AM   #3
82GMC3500
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Re: Transmission issue

I changed the modulator vacuum line over the winter while doing some maintenance.

I just ordered a new modulator,,, will be in at 4 today,,, will give that a shot. Will report back with the results.
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Old 05-15-2016, 11:29 PM   #4
82GMC3500
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Re: Transmission issue

Installed the new modulator,,, good as new. Thank You D13 for your response.
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