Author Topic: Modulator replacement on TH350  (Read 215 times)

DeVilliers

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Modulator replacement on TH350
« on: September 21, 2022, 12:41:07 AM »
Morning all,

I needed to replace the vacuum modulator on the TH350.
It's was real simple to do, so perhaps this is a silly question.

Will any oil run out if I pull the modulator out of the gearbox? Should there be oil running out or not?
When I pulled it off, about a quart of oil came out. The interwebs are not very clear on the issue, so I don't know if it's normal.

Was it perhaps just to full? 

Thanks
1979 Trans Am

5th T/A

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Re: Modulator replacement on TH350
« Reply #1 on: September 21, 2022, 08:52:22 AM »
If the car is sitting level or front end slightly lower, very little oil will come out, maybe an ounce. If the car is jacked up with the nose in the air and rear tires lower, you get quite a bit of oil.

Check the trans oil on the dipstick. This should be done with the car sitting on level ground, the engine should be warmed up and running. You should not run the transmission over filled as it can cause oil aeration.

Also, the rubber hose at the modulator end and intake/carb end should be replaced at the same time. unless recently replaced.
1980 T/A with a Pontiac 461

Gone but not forgotten;
1973 T/A 455
1975 T/A 400
1978 T/A W72
1982 T/A cross fire injected

Two wheel toys;
2014 Harley Ultra Classic Limited
2013 Honda CB1100
2010 Yamaha Vmax
1982 Yamaha Seca 750

Re: Modulator replacement on TH350
« Reply #1 on: September 21, 2022, 08:52:22 AM »
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