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Old Sep 21, 2011 | 04:18 PM
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Default automatic shifting
I'm new to C4s. Newer Corvettes with automatic transmissions can control their shifting characteristics by computer programming. Is this the case with a 1986 automatic transmission?
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Old Sep 21, 2011 | 04:36 PM
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No, the '86 uses the 700r4 & is not electrically controlled. I just browsed the stickies to see if I could find the year the 4l60e was introduced but failed---a search would probably find it, give it a try.
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Old Sep 21, 2011 | 04:39 PM
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1994 was the first year for the electronic trans I belive.
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Old Sep 21, 2011 | 04:44 PM
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93's could have either one, that's the year they started to put them in.
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Old Sep 21, 2011 | 04:49 PM
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my 85 shifts way sooner with the original prom installed. The updated prom I bought in the 90's shifts later.
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Old Sep 21, 2011 | 07:26 PM
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Originally Posted by Cruisinfanatic
my 85 shifts way sooner with the original prom installed. The updated prom I bought in the 90's shifts later.
85 PROM has no control over shifts. TC lockup...yes but not shifts.
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Old Sep 21, 2011 | 07:33 PM
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Originally Posted by Muffin
85 PROM has no control over shifts. TC lockup...yes but not shifts.
Correct. The TV cable controls shift points on a 700R4. And it isn't adjustable....it's either set correctly, or it's not. You'll know when it's not set correctly, because your transmission will burn itself up in short order.
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Old Sep 21, 2011 | 07:50 PM
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Originally Posted by FGVette
I'm new to C4s. Newer Corvettes with automatic transmissions can control their shifting characteristics by computer programming. Is this the case with a 1986 automatic transmission?
Why ? Are you going on the 30th to run with us Fallon ?
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Old Sep 22, 2011 | 05:52 PM
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Originally Posted by Frizlefrak
Correct. The TV cable controls shift points on a 700R4. And it isn't adjustable....it's either set correctly, or it's not. You'll know when it's not set correctly, because your transmission will burn itself up in short order.
then why does it shift under lower rpm when using the original prom?
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Old Sep 22, 2011 | 06:04 PM
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Originally Posted by RichS
1994 was the first year for the electronic trans I belive.
Originally Posted by Frizlefrak
Correct. The TV cable controls shift points on a 700R4. And it isn't adjustable....it's either set correctly, or it's not. You'll know when it's not set correctly, because your transmission will burn itself up in short order.
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Old Sep 22, 2011 | 06:57 PM
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Originally Posted by Frizlefrak
Correct. The TV cable controls shift points on a 700R4. And it isn't adjustable....it's either set correctly, or it's not. You'll know when it's not set correctly, because your transmission will burn itself up in short order.
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