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Old 02-17-2013, 05:47 PM   #1
Bugout1
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C6 transmission

I just bought an 86 bronco with a 3 speed c6 tranny. Not familiar with this tranny. At what rpm/mph should it shift from 1-2, and 2-3?.... 3.55 gears with 31" tires. I did a search on the c6 and came up with nothing. Any insight would be helpful, not sure if this normal or if I have a problem.
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Old 02-17-2013, 06:02 PM   #2
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Originally Posted by Bugout1 View Post
I just bought an 86 bronco with a 3 speed c6 tranny. Not familiar with this tranny. At what rpm/mph should it shift from 1-2, and 2-3?.... 3.55 gears with 31" tires. I did a search on the c6 and came up with nothing. Any insight would be helpful, not sure if this normal or if I have a problem.
Tell us what speeds/rpms the gears are changing.....
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Old 02-17-2013, 06:40 PM   #3
Bugout1
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Around 30 mph +/- from 1st to 2nd, 55 to 60 mph +/- from 2nd to 3rd. Very subtle shifts. Shifts around 3000-3500 rpm. Drops down to around 2000 rpm after shifts. I've googled shift ranges for this but unable to find anything. Thanks.
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Old 02-17-2013, 06:40 PM   #4
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Its all up to your engine.
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Old 02-17-2013, 06:43 PM   #5
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Seems to shift a little high.

My C6 with 351W shifts (If not pushing it) around 20 - 30 and around 45 into 3rd. (4.10 gears on 35s)

Be prepared for bad fuel mileage your looking at 10 - 11 MPG.
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Old 02-17-2013, 06:46 PM   #6
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Have you tried adjusting the vacuum regulator?

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