Question about 2000 Chevrolet Astro

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Trans does not shift right

Rpms gets really high before shifting

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Could be throttle position sensor, may have to bo scanned to pinpoint.

Posted on Jan 09, 2009

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2000 yr.isuzu 250 kb diesel has a noise coming from gearbox area when moving into 5th gear


Its a manual trans right? Those are probably worn syn rings in the transmission, or a loose throw out bearing on the clutch. but if it was a throw out bearing it should be happening in all gears. So its probably worn sync rings in the trans. this means you need your trans rebuilt. go to a local trans shop. to make it shift easier for now, try to match the speed of the car with the speed of the engine. what i mean is when upshifting to 5th gear, wait for a sec til the engine drops in rpms to shift (wait til the rpms are they would be right after you shift into gear). This will allow you to shift without syncs, and make it an easier shift. don't worry its easier then it sounds. but best to get it fixed

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Dodge dakota 2005 automatic transmission, when starting from a stop or low speed sounds as if it is low on fluid rpms high started doing this on tollway when pulling out from the toll both ????seems to...


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When trans shifts into overdrive it shifts at high rpms?


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1 Answer

92 prelude si (auto)


With normal acceleration the 1st to second shift point should be around 2500-3000 rpm. Most of your shifts under moderate acceleration will take place at this same point or when there a light load on the transmission. Under hard acceleration the RPMs will climp higher due to increased power needs and the computer will shift when less power is needed or the RPMs climb to an unsafe speed say5000-6000rpms (depending on where yours redlines). Also going up a steep hill will raise the RPMs higher and goind down a hill will cause a faster shift at lower RPMs. These can always be altered by an individual owner by adjusting shift points, using performance parts and if you have problems (low tranny fluid/trans issues). Your trans RPMS are fine and will vary depening on how your foot accelerates. The shift pattern should be the same every time you drive slow/medium/fast/, look for changes in those patterns you will also catch a problem early.

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1 Answer

Trans not shifting


your transmission has a vacumn modulator on the side it requires vacumn from the engine to shift make sure the vacumn hose from the trans to the engine is plugged on and working, if that is correct then step 2 is the governer which would require a tranny shop to check, but id bet on the vacumn line give it a try! good luck and thankx billy

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