Hot Rod Forum : Hotrodders Bulletin Board - View Single Post - T-350 conversion to a T-350C
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Old 01-30-2012, 05:23 AM
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You can convert a TH350C w/Lockup TC into a TH350 Non-Lockup TC Trans but, not vice versa.
The TH350C's Lockup TC would only drop your Engine's cruising speed about 150-200rpm.
If your Motor Home has a HD 350 Trans it's most likely a TH375B. I'm surprised GM didn't use a TH400 Trans in a C30 MH.

A better option would be a 4L80E Trans or GV/Gear Vendor OD/OverDrive unit. These would give you about 25% rpm drop in OD which would be Ok on flat/level road.

A vehicle like that should have come with a SBC400 or BBC454 Engine & TH400 Trans.