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Old 09-05-2009, 03:46 PM
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700 r4 problem

i have a 700 r4 it shifts fine in reverse but i forward you have to give it gas before it will go in gear and when it does it lunges forward any ideas what this could be

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Old 09-05-2009, 04:27 PM
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Is this a recent rebuild, or an old trans that has been operating for awhile?

Vince
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Old 09-05-2009, 04:32 PM
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Its a recent rebuild
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Old 09-05-2009, 10:24 PM
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there is a pressure loss in the forward clutch section.

Possible problem in the input drum or the sealing rings or a cut lip seal or too much clutch pack clearance.

A pressure gauge attached to the main line port may reveal a problem if the pressure drops off when the trans is placed into "D"
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Old 09-06-2009, 09:19 AM
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thnks ill hook up and check the pressure thnks for your help will let you know
what i find
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Old 09-06-2009, 01:20 PM
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i would suggest starting with easy fixes like checking line pressure and ensuring the throttle cable is connected and properly adjusted.on a 700r4 the throttle cable is the only input to the trans for throttle pressure,same as a 727 or 904 torqueflight.

being a transmission mechanic ive seen many mistery problems with easy fixes that are never found easy.you could have a cut seal when it was rebuild or a cut sealing ring a sticky valve or a bad/leaky valvebody.try checking throttle pressure and cable adjustment,then next would be cheap fix number 2 try some marvel mystery oil a small amount and a deadblow a couple times against the pan.if that doesnt free it up it may be a serious internal problem.
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Old 09-07-2009, 06:49 AM
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Quote:
Originally Posted by buickelectra225
i would suggest starting with easy fixes like checking line pressure and ensuring the throttle cable is connected and properly adjusted.on a 700r4 the throttle cable is the only input to the trans for throttle pressure,same as a 727 or 904 torqueflight.

being a transmission mechanic ive seen many mistery problems with easy fixes that are never found easy.you could have a cut seal when it was rebuild or a cut sealing ring a sticky valve or a bad/leaky valvebody.try checking throttle pressure and cable adjustment,then next would be cheap fix number 2 try some marvel mystery oil a small amount and a deadblow a couple times against the pan.if that doesnt free it up it may be a serious internal problem.
and just what is hitting the pan with a deadblow hammer going to do to fix this guys problem? i didnt know that breaking the filter would fix an internal hydraulic leak.
after over 20 years in the transmission industry i guess you learn something new every day...
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Old 09-07-2009, 08:39 AM
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Quote:
Originally Posted by buickelectra225
being a transmission mechanic........ next would be cheap fix number 2 try some marvel mystery oil a small amount and a deadblow a couple times against the pan.if that doesnt free it up it may be a serious internal problem.
I think I know where you have worked .

Vince
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Old 09-14-2009, 08:20 AM
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checked pressure last night have 20 psi at idle but will go to 60 psi at a 1000 rpm, checked in reverse and drive same pressures
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Old 09-14-2009, 01:16 PM
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Quote:
Originally Posted by gman398
checked pressure last night have 20 psi at idle but will go to 60 psi at a 1000 rpm, checked in reverse and drive same pressures
Pressures are definitely Low. Check all gears positions @1000-1200rpm at Minimum and Full TV cable pull.
Minimum--------Full
P=
N=
R=
O/D=
D=
2=
1=
Don't forget Parking Brake & wheel chocks.
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Old 09-14-2009, 06:07 PM
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Quote:
Originally Posted by buickelectra225
i would suggest starting with easy fixes like checking line pressure and ensuring the throttle cable is connected and properly adjusted.on a 700r4 the throttle cable is the only input to the trans for throttle pressure,same as a 727 or 904 torqueflight.

being a transmission mechanic ive seen many mistery problems with easy fixes that are never found easy.you could have a cut seal when it was rebuild or a cut sealing ring a sticky valve or a bad/leaky valvebody.try checking throttle pressure and cable adjustment,then next would be cheap fix number 2 try some marvel mystery oil a small amount and a deadblow a couple times against the pan.if that doesnt free it up it may be a serious internal problem.
wow thats the first time i have heard that yeah lets break the aux VB along with the filter lol.....sounds like there is a pressure issue.....bad pump maybe pressure regualtor stuck....or maybe the pump output screen didnt get put back in and you are blowing the line pressure into the case just a few things
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