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1951 Ultramatic Delayed Engagement When Warm
#1
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kunzea
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My transmission and rear end have been rebuilt. Prior to driving (cool), the transmission will immediately engage when shifted into drive, low and reverse. After driving (warm) there is a delay in engagement until the RPM is brought up slightly. The trans has a full synthetic ATF in it.

What ATF should be used? Any other suggestions?

Posted on: 6/22 21:33
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Re: 1951 Ultramatic Delayed Engagement When Warm
#2
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humanpotatohybrid
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Read thru this if you haven't yet:
https://packardinfo.com/xoops/html/mod ... ewtopic.php?topic_id=3267

IIRC most people try Type F.

Posted on: 6/23 6:52
Owner of '55 Clipper Deluxe. Engine is stuck-ish.
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Re: 1951 Ultramatic Delayed Engagement When Warm
#3
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Ross
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Type F. I am guessing that low viscosity fluid is causing low pressures. You could thicken up your existing fluid by adding a bottle Lucas transmission magic. It is very helpful. Curious as to your reasons for choosing synthetic--did you just come into a large sum of money?

Posted on: 6/23 15:28
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Re: 1951 Ultramatic Delayed Engagement When Warm
#4
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kunzea
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Pat at Pat's Transmission did the rebuilds. I gave him your name and number yesterday. I drove it yesterday for the first time in 14 months.

Posted on: 6/23 15:54
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Re: 1951 Ultramatic Delayed Engagement When Warm
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PackardDon
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Quote:
Curious as to your reasons for choosing synthetic--did you just come into a large sum of money?


I can't answer for the original poster but personally I would use synthetic in a heartbeat over petroleum regardless of cost. That is, I would use it if it had no adverse affect on the transmission or its functionality so I wonder if during a rebuild it is possible to do the work with synthetic in mind. I'm about to send off a Gearstart Ultramatic so would be nice to know!

Posted on: 6/23 18:03
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Re: 1951 Ultramatic Delayed Engagement When Warm
#6
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Ross
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OK Don, I am still at a loss. Synthetic to what end? What benefits accrue?

Posted on: 6/23 18:38
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Re: 1951 Ultramatic Delayed Engagement When Warm
#7
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PackardDon
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The benefit of getting rid of our dependency on petroleum products. It has to start somewhere!

Posted on: 6/23 18:57
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Re: 1951 Ultramatic Delayed Engagement When Warm
#8
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Ross
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You are aware that synthetic oils are made from natural gas?

Posted on: 6/24 6:47
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