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Upshift low to high when first starting
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   Forward Look Technical Discussions -> Transmission and Rear AxleMessage format
 
Gbreslin
Posted 2019-07-14 12:10 PM (#584810)
Subject: Upshift low to high when first starting


Member

Posts: 11

My 1956 Custom Royal (Super Red Ram V8 4bbl Polyflite), when first being driven for the day, does not shiift from "low" to "high"---it hangs in between as though in neutral. Slowing down, pushing the neutral button, then back to Drive, and moving again will take 3 or 4 attempts before it shifts correctly. Once all of that is out of the way, it works fine the rest of the trip!
Any suggestions will be greatly appreciated!
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57chizler
Posted 2019-07-14 2:23 PM (#584816 - in reply to #584810)
Subject: RE: Upshift low to high when first starting



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Posts: 3213
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Location: NorCal
Most likely the seals in the direct clutch are hardened/shrunk and won't hold pressure when the transmission is cold; when the fluid warms up a little, the seals expand and will hold pressure allowing the transmission upshifts.

Other than an overhaul with fresh seals, you might try an additive like Trans-X or Lucas to soften the seals.
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Gbreslin
Posted 2019-07-17 8:36 AM (#584915 - in reply to #584816)
Subject: RE: Upshift low to high when first starting


Member

Posts: 11

Thank you---I will give it a try!
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