C4 Tech/Performance L98 Corvette and LT1 Corvette Technical Info, Internal Engine, External Engine

Manually shift your automatic?

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Old Oct 14, 2008 | 11:48 AM
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Default Manually shift your automatic?

Hey everyone.... I was having a problem with my car short shifting first and bogging into second. From a dead stop the car will bust the tires loose than short shift into second and bog down. This morning I put it in first manually and punched it from a stop. The car busted the tires loose and kept spinning until I shifted at about 4800. I shifted into second, the bog was gone, and the car chirped second and kept pulling like a train. Now here is my question......How many of you manually shift your automatic? Is there a way to get rid of the car short shifting itself automatically?
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Old Oct 14, 2008 | 12:03 PM
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For some reason when I put my car into first it will automatically shift into second without me shifting. Then it stays in second until I shift into drive. Do I have to shift while slowing down to get into first, or is my tranny on the way out?
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Old Oct 14, 2008 | 12:31 PM
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8T7 changing the speed governor in the transmission will allow it to shift higher.
And in Shake case the shifter cable might need adjusting.
Randy
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Old Oct 14, 2008 | 12:36 PM
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My 700r shifts around 4700 rpms with a Transgo shift kit. I think that's too soon. I shift about 5200 rpms manually.
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Old Oct 14, 2008 | 01:50 PM
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I upshift mine on occassion but I never downshift while the car is in motion. It can damage the transmission by stretching the bands inside of it. When I accelerate in first, it takes off like a bat out of hell, hit 2and and it jerks forward hard, then into drive the jerking is softer. Has always been that way. The later models have been upgraded with a softener to keep it from shif jerking so hard when you put the car in gear from Reverse, Neutral, or Park. Like the others said below me, shift kits help and the firmer the shifts during driving is good. It's the jerking that it does from going into drive that is not healthy but still normal from the factory.

I would like to add, some shift kits allow you to shift manually all the time with a automatic. Just a thought.

Last edited by M.J.L.; Oct 15, 2008 at 01:44 PM. Reason: Clarifying response
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Old Oct 14, 2008 | 04:32 PM
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hmm....I shift my automatic manually when I'm going for performance. It shifts at 5200 rpms automatically, I shift at 6500 manually, big difference! I downshift the mess out of it too, I just have too much fun. :o
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Old Oct 14, 2008 | 05:15 PM
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Originally Posted by Harley Davidson
The later models have been upgraded with a softener to keep it from shifting so hard and helps the transmission last longer.
Say what? I've always been told faster shifting transmissions last longer. Less wear on the clutch packs. Hence, why transmissions with shift kits are said to last longer.
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Old Oct 14, 2008 | 06:29 PM
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Originally Posted by Harley Davidson
The later models have been upgraded with a softener to keep it from shifting so hard and helps the transmission last longer.
(best Geico caveman voice) Uhhh, what?

When a trans has had the shifts "softened", what that means is the clutch plates are slipping to facilitate a softer shift. Transmission shift kits actually add to transmission life by taking this "slop" out of the shift process.
Also, upping the TCS line pressure in a later 4L60E will accomplish the same result.

FYI, I shift my '96 manually most of the time (with the ASR off, too!), and only let it shift itself if I feel like it.
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Old Oct 14, 2008 | 08:03 PM
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Originally Posted by Master__Shake_
For some reason when I put my car into first it will automatically shift into second without me shifting. Then it stays in second until I shift into drive. Do I have to shift while slowing down to get into first, or is my tranny on the way out?
no
shifter is probably out of adjustment
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Old Oct 14, 2008 | 08:17 PM
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Originally Posted by cwyates4
I shift my automatic manually when I'm going for performance. big difference! I downshift the mess out of it too, I just have too much fun. :o

I have a quality shift kit in my perf built trans and shift mine like a stick both up and down.
Engine braking is great on the downhill twisty roads
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Old Oct 14, 2008 | 09:00 PM
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Originally Posted by RacerX70CC
(best Geico caveman voice) Uhhh, what?

When a trans has had the shifts "softened", what that means is the clutch plates are slipping to facilitate a softer shift. Transmission shift kits actually add to transmission life by taking this "slop" out of the shift process.
Also, upping the TCS line pressure in a later 4L60E will accomplish the same result.

FYI, I shift my '96 manually most of the time (with the ASR off, too!), and only let it shift itself if I feel like it.
Looks like I was right on. I'd never heard of softer shifts being better for the trans.
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Old Oct 14, 2008 | 10:00 PM
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what do you think is the right rpm to shift a stock car at?
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Old Oct 14, 2008 | 11:53 PM
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Originally Posted by 198T7VETTE
what do you think is the right rpm to shift a stock car at?
Stock TPI ; no point going over 4500 , you will be slowing down
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Old Oct 14, 2008 | 11:58 PM
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Originally Posted by Kool88vette
My 700r shifts around 4700 rpms with a Transgo shift kit. I think that's too soon. I shift about 5200 rpms manually.
If you're engine is stock - then there is no point holding it to 5200.
the computer is designed to shift at that rpm under hard acceleration in order to get the most out of that gear, and the next.
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Old Oct 15, 2008 | 12:26 AM
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Originally Posted by Spinner_89
If you're engine is stock - then there is no point holding it to 5200.
the computer is designed to shift at that rpm under hard acceleration in order to get the most out of that gear, and the next.


But he does have a superram, so he is getting some use out of those revs.
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Old Oct 15, 2008 | 01:16 AM
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But he does have a superram, so he is getting some use out of those revs.
Gees, with a SR shift at 6k RPM, if the valve train will handle it and the ignition is beefed up.

I get the best 1/4 mile results shifting my L98 close to 6k RPM with a siamese stock intake base and totally stock runners.
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Old Oct 15, 2008 | 02:23 AM
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Originally Posted by Iroc57
no
shifter is probably out of adjustment
How would I go about getting it adjusted? I'd like to be able to keep it in first for certain reasons.. But in all seriousness, it is a pain.
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To Manually shift your automatic?

Old Oct 15, 2008 | 07:15 AM
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Originally Posted by Master__Shake_
How would I go about getting it adjusted? I'd like to be able to keep it in first for certain reasons.. But in all seriousness, it is a pain.

First open up your console. You may have something down in the shifter that is keeping it from going down to first. I will wait for someone to chime in that has adjusted the stock shifter before, aftermarket shifters have adjustment at the tranny but I can't remember if my stock one did
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Old Oct 15, 2008 | 07:51 AM
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Originally Posted by Iroc57
aftermarket shifters have adjustment at the tranny but I can't remember if my stock one did
Same deal; has thread on outer cable with locknuts.
After you have adjusted it to engage 1st , check to make sure it will still engage park correctly; as in the pawl will lock in.
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Old Oct 15, 2008 | 10:35 AM
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Originally Posted by rodj
Stock TPI ; no point going over 4500 , you will be slowing down
Good info....That is where I am shifting at now. Give or take a hundred rpm. Last time I shifted in the mid 5000's I popped a intake gasket (if that was the real cause, who knows).
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