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Nov 6, 2005 | 06:26 PM

shawn47905

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From: indiana

I dont know do you

400m new everything bored 60 over, balanced,ss valves, polished and ported,rv cam,scorpion roller rockers, msd etc...

went for test drive, and the tach said 5000 @ 55mph and 4000 @ 45mph that is way wrong am i right? if so what could the problem be?

thanks in advance
-shawn

Nov 6, 2005 | 06:43 PM

Spaznaut

Fleet Mechanic

Joined: Aug 2004

Posts: 1,276

Likes: 7

From: NE Tennessee

Your tack set to 6cyl or 4cyl?

Is your tach the one that was with the 400M?

What msd box you runnin? Maybe a setting on it to change the number of cylinders.

Nov 6, 2005 | 06:47 PM

Brian S

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Joined: Jun 2002

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It should be about half that. Some tachs have a different setting for 4, 6 or 8 cylinders. Make sure it's on 8.

Nov 6, 2005 | 06:48 PM

shawn47905

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From: indiana

msd offroad box
i think tach is right, just sounds like it's revin' way up

Nov 6, 2005 | 07:04 PM

carova_kevin

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Joined: Oct 2005

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From: carova beach(OBX)

Is your tranny shifting right, You might want to check the vacuum lines coming from your transmission, that will keep it from shifting properlly sometimes

Nov 7, 2005 | 07:43 AM

shawn47905

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From: indiana

how much vaccume is needed to properly shift tranny? i already checked for leaks...

Nov 7, 2005 | 10:54 AM

Spaznaut

Fleet Mechanic

Joined: Aug 2004

Posts: 1,276

Likes: 7

From: NE Tennessee

Your gonna have to drive it and listen for the shifts. There is a modulator on the back of the trans that a vac. hose goes to. Make sure that hose isn't crimped or blocked. You may also wanna check about changing it out and/or the modulator. But your saying that the motor sounds like its turning 5000 when the tach reads 5000? Cause 5000 rpm at highway is screaming. Had a '79 mustang that was turning 4,000 at 70mph and I'd always be half deaf when I got outta the car after a highway run. Of course no interior and a 460 w/c6 didn't help any.

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Nov 7, 2005 | 05:26 PM

shawn47905

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Joined: Nov 2003

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From: indiana

locked in 4 hi.

edel. performer 400 intake if it matters

Nov 7, 2005 | 08:48 PM

#10

Bouts21

Elder User

Joined: Jan 2005

Posts: 797

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Sounds like the tranny may be staying in second gear, check and make sure when you put the fear selector in D, and drive that the tranny actually shifts into drive on the road. Other than that, check what Spaznaut says, modulator and vacumn hose to it. I think I read somewhere that the modulators can also be adjusted, but I'll have to check my books to be sure