Question about 1990 Chevrolet K1500

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Changed engine and the trans seems to not shift correctly

Changed engine and the trans seems to not shift if you let up on the gas pedal it's hanging between gears - if constant speed it shifts fine and worked fine utill the engine change?

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  • 333 Answers

Sounds like its the deterent cable? Thats the passing gear cable going from the throtle linkage to the transmission. Maybee kinked up or in a bind. Or not hooked up. But prob too tight. Or a vacuum leak

Posted on May 06, 2010

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1 Answer

Will not shift out first gear


I assume this is an automatic?
If the shift linkage is not damaged (jammed or disconnected the usual answer is the governer valve in the transmission is sticking.
The fix for this normally involves pulling the trans out stripping it apart cleaning the governer valve new seals gaskets and reassembling.
(translated lots of money) try using a auto trans flush to clean all the gunk out of the transmission. Run the trans through all the gears with the trans flush and try driving it (only short distance test drive as its not proper trans fluid) see if you can get it out of first gear (flatten the gas pedal and let the engine go to max revs on short bursts) once it shifts once or twice go back and remove the trans flush fluid and replace with correct specification auto trans fluid I would also change the transmission filter at this point if it was mine .

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When the peddle is pressed really hard the trans is supposed to increase the shift firmness. The problem may be that the engine has some power problem which makes the trans look like the problem. If the engine is not operating correctly power wise hard shifting will occur.
If the car has a trans shift cable and it is adjusted incorrectly it will also shift hard. If the trans has vacuum modulator that is out of adjustment or going bad it will also shift hard. Many trans shops will test drive it for free so let the trans shop advise you for free and save some time.

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WHEN I STEP ON GAS, IT VIBRATES THEN SLOWLY TAKES


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May 15, 2010 | 1996 Dodge Caravan

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Jeep grand cherokee 1995 4.0 engine laredo. The transmission does not shift to high until I get to 50mph instead of 40mph. Also when I release gas pedal the rpm does not drop to 750 immediately, it lingers...


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mcdevito75 here, I would figure yes, if your shifting while in motion, definetly yes, when you shift your changeing gear ratios in the 4 wheel drive or the transmission, this will cause the engine to slow but also make the gas pedal moe responsive.If you feel or hear this slowing down of the engine while standing still (at a red light) it"s most likely the computer contolled sensor in the tranny. I woulkd still check with my local shop for their advice too.

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depends on gas pedal position,the lighter you are accelerating the earlier the trans should shift,if it always hangs on in gear get it looked at...as it can shift at redline (5000-6000 rpm,if you hold the gas peadl down fully).

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If the trans has a whine and shifts a little hard then you need to take if to a service center and have the trans flush and filter changed this might correct the problem. But if you have never had the trans fluid change and have 100,000 on it trans might be going bad. Trans fluid and filter should be changed every 40,000 miles.

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It has nothing to do with the transmission, it's your engine mount thats bad.

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