running high rpm's?
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running high rpm's?
im 16 and just recently started working on cars i have a 1986 F250 with a 460 and a tci automatic tranny and was told it had a shift kit in it. is it normal for it to be running 3000rpm's at 30-45mph??
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Joined: Apr 2009
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From: In the garage
Your truck shouldn't be revving that high for the speed. Try shifting through the gears manually and see if you have all your gears. If it does, leave it in drive and verify that it's shifting itself through all the gears by counting the shifts out. If everything is good, I'd verify that your tach is in working order. You should be able to tell by listening to your motor if it's revving up that high.
Senior User
Joined: Oct 2009
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From: Effort, PA
Here's a question... Does it SOUND like it's revving that high? As was said before the tach could be misleading due to a ground short or a needle that has moved.
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From: Mexia, TX
Assuming the tach is correct, running that high RPM at only 30-45 would suggest it's still in First...my truck's stock and in Third gear, I'm doing about 75 or 80 at 3000RPM....
If it's got a manual valve body, you might have lost the automatic shifting function, since a manual valve body is just that, manually controlled. You could be able to shift manually with the shifter if that was the case.
I would give the previous owner a call and ask them about the transmission. See if they have any paperwork, receipts, manuals, etc. That way you're not scratching your head as much.
If it's got a manual valve body, you might have lost the automatic shifting function, since a manual valve body is just that, manually controlled. You could be able to shift manually with the shifter if that was the case.
I would give the previous owner a call and ask them about the transmission. See if they have any paperwork, receipts, manuals, etc. That way you're not scratching your head as much.
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Joined: Dec 2007
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From: Lost
I have to concur. Either the tach is reading wrong, or the trans is staying in 1st gear.
Not familiar with the TCI built C6, but stock they won't shift out of 1st gear until about 3,000 RPM if the vacuum modulator is either bad or has no vacuum source. Even trying to manually shift with a bad or disconnected modulator doesn't always work.
You also need to make sure the kickdown linkage isn't jammed in the WOT position. If this happens, the trans doesn't want to shift, as it thinks you are hammering the throttle.
Not familiar with the TCI built C6, but stock they won't shift out of 1st gear until about 3,000 RPM if the vacuum modulator is either bad or has no vacuum source. Even trying to manually shift with a bad or disconnected modulator doesn't always work.
You also need to make sure the kickdown linkage isn't jammed in the WOT position. If this happens, the trans doesn't want to shift, as it thinks you are hammering the throttle.
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yes it does have 33s on it and i no it at least shifts out of first im assuming it is the tach it dosnt sound like its revving that high im gonna try shifting it manually like you guys have said to make sure that it is getting out of 3rd to
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From: Mexia, TX
A good way you can tell if your speedometer is off is to go somewhere with a speed limit of around 30-40, keep up with the flow of traffic. Or have a friend or someone drive alongside you at 30, for example, then take note of what your speedometer is reading when you're going the same speed as your friend (judged by the fact that both vehicles are staying even with each other). OR, eliminate all guesswork and borrow a GPS unit and just see what it says your speed is. lol
My tires are just a little bit bigger than stock (29" instead of 27 or 28), plus my speedo cable is shot, so my speedo is about 10mph slow.
My tires are just a little bit bigger than stock (29" instead of 27 or 28), plus my speedo cable is shot, so my speedo is about 10mph slow.
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theothewolf
1980 - 1986 Bullnose F100, F150 & Larger F-Series Trucks
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