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

Gear chage/Speedo readout

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Old Oct 8, 2016 | 08:08 PM
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Default Gear chage/Speedo readout

I am changing 2.59 gear to 3.07 how do I correct speedo readout?1994 LT1 base auto.
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Old Oct 8, 2016 | 08:31 PM
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Originally Posted by A Peter C4
I am changing 2.59 gear to 3.07 how do I correct speedo readout?1994 LT1 base auto.
In your '94 with a PCM it can be done in programming of the PCM.
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Old Oct 8, 2016 | 08:34 PM
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Who can do this?What is typical cost?
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Old Oct 8, 2016 | 08:41 PM
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Originally Posted by A Peter C4
Who can do this?What is typical cost?
There might be some things to consider other than just SPEEDO/ODO correction. It might be nice to wait and see if someone with a '94+ might post and be able to maybe mention if thhere are any other differences in the "tune" 2.59 to the 3.07. I'd think with the e-version of the 4L60 that there very well could be. If you wanted to do any other minor tweaks now would be the time to consider it. Do you have the 3.07 bought/installed yet OR - you've time to plan?

Last edited by WVZR-1; Oct 8, 2016 at 08:41 PM.
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Old Oct 8, 2016 | 08:51 PM
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I have time to plan,looking for good deal on D36 pumpkin 3.07.Just missed one in forum,was $275. Went fast,to first chime in I believe,Oh well keep locking.
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Old Oct 8, 2016 | 11:30 PM
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Originally Posted by A Peter C4
I have time to plan,looking for good deal on D36 pumpkin 3.07.Just missed one in forum,was $275. Went fast,to first chime in I believe,Oh well keep locking.
Why would you want a D36? There is a reason it is cheap. Usually because it is less desirable.
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Old Oct 9, 2016 | 02:13 AM
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Originally Posted by aklim
Why would you want a D36? There is a reason it is cheap. Usually because it is less desirable.
The D36 certainly seems to do the job for most. Lack of proper maintenance will kill any rear. I didn't know that a D36 was "CHEAP" - availability seems to dictate/create pricing. Maybe you meant "lesser quality" as "CHEAP" and I don't believe that either.
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Old Oct 9, 2016 | 09:11 AM
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D36 is fine for most driver cars not doing hard launches or with slicks, especially with an automatic.

Kinda like Blue tag vs Black tag ZF 6 speeds. Most will never break a blue tag unless abused.

Of course, I have Black tags and D44 in both of my c4's.... I'm as guilty of "better safe than sorry" as anybody.

Last edited by cadmaniac; Oct 9, 2016 at 09:11 AM.
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Old Oct 9, 2016 | 11:24 AM
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I'm installing the 3.07 in my '96. Will the computer adjust for the upgrade?

I was hoping to plug & play
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Old Oct 9, 2016 | 12:45 PM
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Originally Posted by vette196
I'm installing the 3.07 in my '96. Will the computer adjust for the upgrade?

I was hoping to plug & play
I doubt it. Speedo will at least be off
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Old Oct 9, 2016 | 04:13 PM
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Originally Posted by vette196
I'm installing the 3.07 in my '96. Will the computer adjust for the upgrade?

I was hoping to plug & play
It will not adjust, the speedometer will be off.
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Old Oct 11, 2016 | 06:36 PM
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If your 1996 is like my 1995 (IDK how your tune is since mines OBDI not OBDII) but your shift points will be off to. (In 95 the shift points are by speed not rpm so when I when from 2.59 to 3.54. I put used tuner cat to change my rear gear ratio in the tune and then went on a drive it was bouncing off the limiter without shifting at WOT (wide open throttle) the good news is my speedometer was reading correctly.

Mike
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