one small problem after tranny rebuild - GM Forum - Buick, Cadillac, Chev, Olds, GMC & Pontiac chat


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Old 10-20-2007, 06:05 AM   #1
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Default one small problem after tranny rebuild

I have to recalibrate the speedometer or replace the cable with a new one. The cable that was on the cutlass tranny is what I think is on there now. I'm thinking that if I replace that then it wont read 15 mph under the actual speed as it does now.
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Old 10-20-2007, 07:05 AM   #2
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Unless the cable is damaged and sticking it won't affect the speedo. You might want to check the numbers and see if the gear ratios are the same.
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Old 10-20-2007, 07:34 AM   #3
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The SSE that you have, IIRC, has a 3.33 final drive ratio. Did that trans get replaced with one that has numerically lower gears?
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Old 10-20-2007, 11:48 AM   #4
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Default sse gears

Could be a different final drive ratio or you need to install the mem cal in the computer from the other car. Do you have access to the trunk spare tire labels from both cars for a comparison?
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Old 10-20-2007, 06:56 PM   #5
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The mem cal is the original from the original ECM. I replaced the ECM when I purchased the car. According to jr3800 I should have the 2.79 fdr and the rebuild was done on the original tranny. Even when I the 3.33 tranny was in it I didn't have this trouble.
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Old 10-20-2007, 07:31 PM   #6
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What cable are we talking about?

The only cable will be the TV cable..

There is no speedo cable on these cars, They use a Speed Sensor...

Now the question is do you have the 3.33 or the 2.97 currently? I think you do need the correct Mem-Cal for the ECM to be happy...

But I am confused by the 15 mph off

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Old 10-20-2007, 07:45 PM   #7
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Tested with my son on highwy, when he was at 55 I was at 40, when he was at 60 I was at 45. Could I get a new speed sensor? Can I calibrate the one I have now? Is this worth the trouble to fix or just learn to read the spdmtr this way?
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Old 10-20-2007, 08:38 PM   #8
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I am wondering if the right Pulse wheel of sorts was used...

The ECM goes by the amount of Pulses per mile..

I may have to do a little research on the 440-T4... If I don't get back to you in a day or so Drop me a PM...

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Old 10-20-2007, 10:57 PM   #9
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will do, thanks!
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Old 10-20-2007, 11:33 PM   #10
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Looks like one of 2 things..

Either the Tooth count on the Speedo Gear is wrong( possibly wrong governor ) Or you may have the wrong Mem-Cal for this trans...

What gear ratio did your car come with as opposed to the trans you used... What year was the trans that you used as well... And by chance would you happen to have the Numbers off the trans?

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