Drivetrain Clutch, Torque Converter, Transmission, Driveline, Axles, Rear Ends

Trans not holding rpms

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Old Jun 5, 2006 | 09:17 PM
  #1  
toegead93's Avatar
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From: West Palm Beach, FL
Trans not holding rpms

Typically when driving in 1st, 2nd, or 3rd gear (not in OD) if I am at a higher rpm (say 3000) and let off the throttle the rpms stay near 3000 and very slowly drop. Then when I hit the throttle the rpm is still high and my power is readily available.

Now when I let off the throttle while driving at 3000 rpms the rpms drop down to idle (1200rpms) and when I hit the throttle the car won't accelerate until the rpms are back at 3000. Basically the transmission will hold the rpm where it should. I am using 3000rpms as an example, this problem occurs at all rpms and in every gear except OD (4th when the converter is locked). Any ideas?
Old Jun 8, 2006 | 12:42 AM
  #2  
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Re: Trans not holding rpms

very confusing. both paragraphs sound like they contradict themselves. can you redescribe it for us? I almost thought i understood. lol thanks
Old Jun 9, 2006 | 06:21 PM
  #3  
toegead93's Avatar
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Re: Trans not holding rpms

The first paragraph is a description of how my car USED to drive.

The second pragraph is a description of how the car drives now, broken

I spoke to a trans shop about the problem and they described it as 'slipping' and whatever it is it's internal. Unfortunately my transmission shop is 150 miles from me in Orlando. For as large as S. Florida is it seems to be the black-hole of quality performance shops.
Old Jun 10, 2006 | 12:11 AM
  #4  
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Re: Trans not holding rpms

"Now when I let off the throttle while driving at 3000 rpms the rpms drop down to idle (1200rpms) and when I hit the throttle the car won't accelerate until the rpms are back at 3000. Basically the transmission will hold the rpm where it should. I am using 3000rpms as an example, this problem occurs at all rpms and in every gear except OD (4th when the converter is locked). Any ideas?"

isnt that supposed to happen? I'm confused, slipping is like what my tranny is doing right now, say you're at idle, hammer it and it flashes to 3000 on a stock stall, then when the rest of the car catches up to the motor, you're say going only 60 mph instead of 75 mph, due to less than desirable clutch material.

when you pull your foot off the gas in an auto it should go back down to idle and the rest of the car start to slow down, then when you get on it, it should fly back to the rpm necessary to keep up with the tires, and then pull on up.

now if you mean that you pull to 3000 and then it kinda lets go and you dont pick up speed from that point on, even when you're spinnin' say 6000, then that's slippage.

what you described sounds like a normal tranny, think about it, if your motor is spinning 1500 rpm in drive a 1:1 gear, and the tires are spinning at say 70 mph where you were when you were at 3000 rpm, the motor needs to catch up to the tires in order to make them spin faster, that 1500 rpm would be good for say 35 mph, 35 mph isnt greater than 70 mph so the car will keep decelerating.

and if you coast you shouldnt be holding the rpm of the speed you're going, cuz think of when you brake, you'd be fighting the motor, and you'd burn up brakes fast, plus it would suck more gas and cause some funky cylinder mixtures when you're carb was open to idle, but the engine was winding 5000.

I think you're transmission is fine, maybe i dont understand

Last edited by 84firebird; Jun 10, 2006 at 12:19 AM.
Old Jun 11, 2006 | 01:11 PM
  #5  
toegead93's Avatar
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Re: Trans not holding rpms

It is kind of tough to explain.

"when you pull your foot off the gas in an auto it should go back down to idle and the rest of the car start to slow down, then when you get on it, it should fly back to the rpm necessary to keep up with the tires, and then pull on up." This description sound like the problem I have, however you describe it as normal.
Unfortunately it is not normal for my car, my car NEVER done this with the stock converter or the new converter. I have had the car for 5 years and put 50,000 miles on it, this is not normal. This is the first time the rpms have EVER dropped so low. When I'm driving at 70mph and let off the throttle the rpms drop to 1200 and I can rev up like I'm in neutral until I get to 3000rpms. Before in 3rd gear I could let off the throttle and feel the 'power' readily available just like if I wear driving aa M6 in a low gear.

Maybe comparing my car to an M6 might clear things up a bit. My car feels how it would feel if you depress the clutch pedal and let off the throttle at 70mph. My car should feel the same as an M6 when you let off the throttle and don't touch the clutch. Does that make more sense?

I can't think of any other way to describe it, but it definately is not right. Sorry for the confussion and thanks for your attempt to undrestand me
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