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Old Mar 16, 2011 | 03:41 PM
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Car is a cam only lq4 with 3.73 gears running a 26" tire with a circle d 4k converter, not exactly which model it is but I believe it is a mult-disk. It's been a while since I purchased it. Problem is I'm running out of gear I'm shifiting into third at about 7xmph and fourth running out of gear at 9xmph. My question is this a mechanical issue or just a bad combo of parts. Transmission is shifting fine and not slipping and fluid looks good. Car had been sitting for months while new motor was installed. Even daily driving I noticed the converter feels more loose then previously before doing the motor swap, but that could just be me. I've pm'd circle-d to see what they think. Thanks.
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Old Mar 16, 2011 | 06:22 PM
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You should be hitting 5040 RPM at 99 MPH IN THIRD.

Somethings not right. Any idea what RPM you're running out of gear at?
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Old Mar 16, 2011 | 07:34 PM
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It's red lining in 4th at around 97-98. Basically I'm not able to go over 100 mph.
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Old Mar 16, 2011 | 07:56 PM
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I seen a thread about this a while back I think.. Let me do some research for ya and I'll get back with it.
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Old Mar 16, 2011 | 08:01 PM
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Thanks appreciate it
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Old Mar 16, 2011 | 11:10 PM
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Your transmission is slipping or something.
With 3.73's and 26" tires in 4th should be running at 3565 RPM plus converter slip.
And if you are redlining at say 6100 the converter is slipping 2565 rpm. Thats way too much or you've got serious tuning or mechanical problems.
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Old Mar 16, 2011 | 11:13 PM
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Well the tuner stated that the trans was shifting fine as he was looking at it in the tune. I'm leaning towards a mecanical issue. Is it possible for a converter to go bad and get "looser". I curious to hear what circle-d thinks. I'll be giving them a call tomorrow if I get a chance.
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Old Mar 16, 2011 | 11:35 PM
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Could be the converter stator but I doubt it.

Did your tuner do a running scan? Chassis dyno? Does he know what it's doing at wot and 100 mph?
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Old Mar 17, 2011 | 08:32 AM
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Yea he logged the runs. It was not on a chassis dyno. We did wot runs on a back county road. Not sure exactly what was happening during wot but the tuner said everything looked good. He thinks the converter is just too loose of a converter for the setup I have.
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Old Mar 17, 2011 | 09:29 AM
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Did your tuner force lockup? I would suggest getting into 3rd gear at about 30 mph, roll into the throttle, and force lockup, then lay into it hard and see if it holds.
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Old Mar 17, 2011 | 10:55 AM
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He didn't force lockup. We did 35mph and 40 rolls. Third gear would finish quickly and then onto fourth and never was able to go over 100mph due to 4th beginning to redline.
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Old Mar 17, 2011 | 10:57 AM
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Sounds to me like maybe a clutch pack slipping. How does it do driving normal with the converter locked?
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Old Mar 17, 2011 | 11:45 AM
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I noticed normal driving it takes a lot of rpm to get moving more than what it used to be before replacing the motor. But that could just be me from not driving the car in so long. Lockup is set around 40mph and drives fine. No sign of slipping tranny when cruising.
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Old Mar 18, 2011 | 10:11 AM
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Any other suggestions?
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Old Mar 18, 2011 | 11:33 AM
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Originally Posted by hitemup9nine
Any other suggestions?
Get a tuner that knows how to log transmission functions.
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Old Mar 18, 2011 | 01:06 PM
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Well since it drives normal at cruising then it appears like its the converter. You said it seems more loose under part throttle. So full throttle may be just blowing it away.
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Old Mar 18, 2011 | 01:13 PM
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I guess I'll just pull the converter and send it back to Circle-D for a refresh. Do you think I should keep the 4k stall or move down to a 3500. Plan to use 150-200 shot of nitrous.
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