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Old 02-10-2006, 07:25 AM
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95 4R70W doubble bump

to crosley or chazmac,
we had a 95 ford f150 in for rebuild and when it was finished it has a "doubble bump" engagement. in others in the past, i thought i had found that replacing the EPC solenoid on the build seemed to pretty much fix the problem in other vehicles with the same trans, but not on this 1.. it has a new EPC solenoid, and yet seems to have this type of engagement... ive been thinking maybe the mlps might be it or part of it, but i would rather have some sort of input so the next unit wont have this trouble...its not too noticeable, but its there. thx

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Old 02-10-2006, 09:58 PM
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the vavle body is known for worn bores in the PR area , boost valve.

has the pressures been monitored during this problem?



Quote:
Originally Posted by tnsmith10
to crosley or chazmac,
we had a 95 ford f150 in for rebuild and when it was finished it has a "doubble bump" engagement. in others in the past, i thought i had found that replacing the EPC solenoid on the build seemed to pretty much fix the problem in other vehicles with the same trans, but not on this 1.. it has a new EPC solenoid, and yet seems to have this type of engagement... ive been thinking maybe the mlps might be it or part of it, but i would rather have some sort of input so the next unit wont have this trouble...its not too noticeable, but its there. thx
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Old 02-11-2006, 06:49 AM
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no, only because it shows no real signs of pressure loss... (i know, if in doubt, check the pressures...) but if theres any issues (which i doubt, owner of the truck has a crown vic that hasnt been built, does the same thing) but, i have from other places where ive worked been able to pretty much resolve it... just this time,it didnt... its obvious i got lucky and am still missing something, or maybe the EPC just isnt right.. ( i know even though new, can be faulty)
thx for the reply crosley
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Old 02-11-2006, 08:14 AM
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If you replaced the EPC, did you make sure that the EPC retainer is the new updated part? This is important as it holds the EPC fully into the bore in the case. Don't have the Ford Part # with me but I can get it if you wish.
I am assuming this double bump apply is in Drive?
If the bump is in Reverse, the Low/Reverse band servo pin is too short. This allows the reverse input clutch to apply first, turning the planetary before the band can hold. When the band applies, you get the second bump....
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