Re: '53 Ultramatic, delayed TCC unlocking when warm
Posted by HH56 On 2017/11/1 10:38:10
The direct drive should disengage at 10 to 11 mph and since one would assume it has been working normally prior to the recent issue I believe a dirty or sticking governor valve has been the usual cause of the late disengagement on units that suddenly started having the problem. If you recently acquired the car and have no history of it's prior performance then other things could bear looking into.
If the rebuild could also have included doing a factory mod of changing or modifying a check valve which had not been done back in the day when car was in normal use, there could be a condition in the governor which may need to be corrected.
A less likely cause could be the quality of the rebuild. If some critical bushings or a worn shaft did not get replaced pressure could be bleeding off and not allowing other valves which are involved to function properly. Since it seems to happen when warm and oil is thin a pressure bleedoff problem could need to be investigated.
The "grabby" part may be due to glazed and hard direct drive clutch lining. It is a common occurrence after all these years and is frequently accompanied by a groan or "mooing" sound. The oondition is more annoying than harmful and can be relieved by letting up on the throttle as the direct drive transition is made so the clutch is allowed to engage quickly without as much slipping.
I know some don't care much for the transmission "wonder products" but if the car sees very little use and since something needs correcting anyway, perhaps a bottle of transmission conditioner designed to free up valves might be worth trying.
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If the rebuild could also have included doing a factory mod of changing or modifying a check valve which had not been done back in the day when car was in normal use, there could be a condition in the governor which may need to be corrected.
A less likely cause could be the quality of the rebuild. If some critical bushings or a worn shaft did not get replaced pressure could be bleeding off and not allowing other valves which are involved to function properly. Since it seems to happen when warm and oil is thin a pressure bleedoff problem could need to be investigated.
The "grabby" part may be due to glazed and hard direct drive clutch lining. It is a common occurrence after all these years and is frequently accompanied by a groan or "mooing" sound. The oondition is more annoying than harmful and can be relieved by letting up on the throttle as the direct drive transition is made so the clutch is allowed to engage quickly without as much slipping.
I know some don't care much for the transmission "wonder products" but if the car sees very little use and since something needs correcting anyway, perhaps a bottle of transmission conditioner designed to free up valves might be worth trying.
Attach file:
(81.00 KB)
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