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Curious rpm / gear question

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Old 07-01-2011, 08:14 AM
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Question Curious rpm / gear question

So I've been wondering about this for a long time, finally i decided to ask.

I have a 98 A4 z28, the fourth gear kicks in @ approx 37 mph, I keep my foot on the throttle at the same position, then @ approx 48mph the rpm drops again as if a fifth gear has dropped in, what's the story / mechanism behind this?

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Old 07-01-2011, 08:52 AM
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Old 07-01-2011, 11:59 AM
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What you feel at 48mph is the convertor locking up.
Old 07-01-2011, 12:31 PM
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Torque Converter going into full lockup
Old 03-31-2012, 08:18 AM
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the same thing here,

i believe your car is Japan's specs. you can see that from the fender indicator lights and the side mirrors.

i like that 5th shift or what ever it is, cruising at 60 miles doing 1600 RPM
Old 03-31-2012, 08:18 AM
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the same thing here,

i believe your car is Japan's specs. you can see that from the fender indicator lights and the side mirrors.

i like that 5th shift or what ever it is, cruising at 60 miles doing 1600 RPM
Old 03-31-2012, 11:46 AM
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Originally Posted by SOMbitch
What you feel at 48mph is the convertor locking up.
Old 04-03-2012, 12:24 PM
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I started leaving my car in 3rd anytime I'm driving under 45. Are there any adverse affects to driving in overdrive at low speed for an extended period of time?
Old 04-03-2012, 02:39 PM
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Originally Posted by MZAC
I started leaving my car in 3rd anytime I'm driving under 45. Are there any adverse affects to driving in overdrive at low speed for an extended period of time?
No because your convertor will keep itself unlocked till you hit 45mph. And anytime your cruising around and your speed drops below 45mph it will unlock itself. The only exception to this rule would be if you had a manual valve body in your 4L60E. And you don't!




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