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Transmission clunking when I let off gas

When car shifts into overdrive as I go down a grade and do not have my foot on the gas there is a clunking noise

Posted by Anonymous on

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6 Suggested Answers

6ya6ya
  • 2 Answers

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Posted on Jan 02, 2017

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SOURCE: Trans clunking when slowing down

Sounds like youi may have a few serious problems going on to have that kind of back lash occuring at higher speeds. I have experiance with low spped clunks on Bronkos and your type of vech being a car dealer. One you might try for low speed clunk on take off and braking at stop likts just completeing a stop? Pull the drive shaft and lubricate the splin - two check your leaf springs for weakness and wore bushings - take a look at your shocks - three u bolts holding springs to rear axle housing may be letting the axle housing actually dip or tweak or all those thing in combination - now you may have some serious slop in the pig - transfer case may be causing that clunk - as far as high spped clunk and activity you have a serous problem and you just might drop the transferr case have an accident fliping over..............Mike South Bend Indiana don't just keep driving and making problem worst...........

Posted on Sep 27, 2008

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  • 22 Answers

SOURCE: f350 automatic transmission

Since you have the same 4R100 as the 7.3L I recommend checking the resistance of the solenoid connectors, it is like sonic said at the rear passenger side and it will be hiding under some flexible heat shielding (it is next to the exhaust pipe afterall..). Specifically, take the resistance (ohms) from pins 1 to 4 doesn't matter which is black or red. It should be 10-20 ohms. You also might have to put a jack under the transfer case, unbolt, drop the support beam and let the whole drivetrain come down a bit for decent access. These pins should be labeled but pin 1 is in the row away from the tab and is the rear-most pin. Replacing the solenoid body is $200 and a pan drop. Grab a few gallons of Mercon!

Posted on Nov 19, 2008

michigan man
  • 3533 Answers

SOURCE: '89 f150 4x4 AOD doesn't like overdrive

get the truck where you can service it and have a transmission service done this will include: new fluid and transmission filter
because it sounds as if it has not been changed in awhile open the hood and if the transmission fluid smells cooked change it right away

Posted on Jan 06, 2009

  • 1 Answer

SOURCE: transmission shifts hard ,overdrive light flashes

I had a similar problem which turned out to be caused by a leaking vacuum line.

Good luck!
Brent

Posted on Apr 11, 2009

  • 1 Answer

SOURCE: f150 transmission neutralizes when shifts to overdrive

I have that exact same truck and transmission and My Transmission did the exact same thing about a year ago and there was some kind of snap ring inside the transmission that broke. I originally thought it had to be an electirical problem because the truck shifted fine until OD or if i turned OD off. The 4r70w is a light transmission and i would suggest you have a shift kit put in and they make a heavier kit to beef it up.. Sorry its probably not the new you were looking for.

Posted on Apr 15, 2009

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2004silverado 4/4slipping out of overdrive going up a grade, works alright when you manually shift have over 150 thou.miles, fourwheel works good


hi,

all trucks and cars will do this exact thing that you are talking about, this is built into the transmission so that you do not lug down the motor. first thing that it will do is drop out of (lock up)
in the converter then it will drop put of (overdrive) with the more strain you put on the motor and or more gas pedal. now if this is happening to fast or soon the you have something in the transmission going bad o in need of adjustment.
dave

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1 Answer

What could be the cause of suddenly loosing overdrive, reverse, and hard shifting on 1993 700R4 transmission?


first off --run the fault codes
it could be a wiring problem, TCM , or VSS problem, oil change needed or transmission actuator problem

Jun 20, 2017 | 1993 GMC Sierra

1 Answer

1985 pickup with automatic transmission


Could be a vac modulator problem.

Jul 04, 2012 | Cars & Trucks

1 Answer

Do you drive with o/d on or off for normal driving when do you use it


You can drive with the switch on or off, it doesn't matter. Most vehicles default to the "on" position every time the engine is started, I'm not sure if yours does. The reason you can select the O/D off is because in some driving conditions the transmission will shift in and out of overdrive several times and it gets a little annoying. These conditions could be while driving up a grade at freeway speeds or driving at close to normal speeds but in heavy traffic. Every time the transmission shifts, it generates a little heat. Normally that heat is dissapated through the cooling system, but if the transmission keeps shifting in and out of overdrive, expecially in heavy traffic or climbing a grade, the cooling system may have a hard time keeping up. If you feel the transmission shifting in and out of overdrive more than usual, and you're in an abnormal traffic condition, go ahead and turn the O/D off. Just remember to turn it back on again when traffic returns to normal so you can get the best fuel mileage.

Nov 22, 2010 | 2001 Toyota Corolla

1 Answer

1992 GMC Suburban not shifting into OD, Transmission Modulator?


The shift down linkage on the carburetor below the gas pedal cable might need to be adjusted to increase the hydraulic pressure on the internal clutch plates in the transmission it shows you how to do that in a car manual.

Jan 07, 2010 | 1992 GMC Suburban

1 Answer

Ford f-250 super duty,overdrive will bump on a slight grade at 50 -65 miles per hour.Truck drives great and no other problems with the transmission.I have started turning off the overdrive on slight hills...


what do you mean by "bump?"
if it is vibrating it could be one or more things and if it is down shifting hard to lower gear it could mean other things.

Oct 14, 2009 | Ford F-250 Cars & Trucks

2 Answers

Transmission fault,7800 miles


WELL ITS RECOMMENDED TO ALWAYS REMOVE FROM OVERDRIVE WHEN TOWING TO PREVENT TRANS DAMAGE. POSSIBLY HAD A PROBLEM ALREADY AND THIS WAS THE FINAL STRAW,SORRY DUDE. USUALLY THERE 4R70 TRANSMISSIONS ARE GOOD TRANSMISSIONS. POSSIBLY A BAD SOLENOID OR ISSUE IN VALVE BODY,DON'T CONDEMN INTERNALS YET UNTIL HAVE A TRANS TECH INSPECTS IT. THEY HAVE A FEW UPDATED FOR THESE TRANSMISSIONS ALSO

Jul 12, 2009 | 2008 Ford F 150 2WD

1 Answer

Transmission passing gear keep either getting stuck or it dont work because the motor keep idling up in first gear


this could be relative to many things, however you should check a few things before asessing the possibilities. When you put the truck in gear from park, Drive (overdrive) Should be the third notch you come to. so your in park, pull down clunk you're in reverse, clunk you're in neutral, clunk, now you are in drive. If you dont feel/ hear four notches/ clunks, you should be in overdrive. If you take off and it over revs 1st ( you shouldn't see more than 15 mph before it shifts on a stock transmission unless your flooring it and taking off fast) and then hard shifts to second gear, progresses to third gear normally, but wont progress into overdrive, it may be related to your vaccum advance, your shift linkage, or even possibly your timing. From the sounds of it, I would say vaccum advance is the likely cause, if it is otherwise in stock condition. If this is the case it could be as simple as reconnecting a vacum hose to the distributor. Should be to the left hand side of the cap, between the cap and intake manifold as you are looking at the firewall.

Mar 15, 2009 | 1990 Chevrolet Suburban

1 Answer

94 chevy vandura Tranny problem


what kind of trans is it? 700 r 4? or 400? or what?

Jan 17, 2009 | 1987 GMC VanDura

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