Speedometer is off - Moparchat

Bagherra · #1 11-08-2003, 06:53 PM

Where would I go to look for different speedo gear (I think that is what you call it)?

Since I've put in a "new" rear with 4.10 gears, my speedo is way off. It used to be about 10 mph off with the 25" tall tires, but now I can't even estimate when I'm driving.

Is there a place I can get this type of part? I don't know where to begin on this. Thanks.

dwc43 · #2 11-08-2003, 06:56 PM

You can get speedo gears from your dealer and they have a chart with tire and gear sizes on them so you can pick pretty close the first time around.

ehostler · #3 11-08-2003, 08:59 PM

This is based on the formula that I posted in the Tech Forums.

25" diameter with a 4.10 gear comes out to 43.34 teeth. So 43 teeth will have the speedo running just a little fast (very close to actual). The PN for a 43 tooth speedo gear is P2538943.

Also, don't forget to properly index the speedo gear (see pic at the bottom of this).

Bagherra · #4 11-09-2003, 10:38 AM

Thanks! That helps a lot...no guessing involved.

cuda66273 · #5 11-09-2003, 12:53 PM

Just use the tach....
40 MPH = 4800 RPM
60 MPH = 5800 RPM

Now that's a gear!

dkn1997 · #6 11-09-2003, 11:37 PM

there is also a chart in the Year One catalog

dave571 · #7 11-10-2003, 12:34 AM

Quote:

Originally posted by cuda66273
Just use the tach....
40 MPH = 4800 RPM
60 MPH = 5800 RPM

Now that's a gear!

For what, racing 1/10 th miles??

I suppose it would really kick a$$ light to light

Bagherra · #8 11-10-2003, 08:55 AM

Quote:

Originally posted by dave571
For what, racing 1/10 th miles??

I suppose it would really kick a$$ light to light

Not my gear.

I hit maybe 4000 rpm going 70mph on the highway in 3rd.

Bagherra · #9 11-10-2003, 08:56 AM

Quote:

Originally posted by dkn1997@aol.com
there is also a chart in the Year One catalog

So does Year One sell them? I have a catalog at home...I need to get a headliner too, so I'll take a gander when I get home.

Thanks!

John Kunkel · #10 11-10-2003, 05:36 PM

The speedo pinions are still available from the dealer.

cuda66273 · #11 11-10-2003, 10:58 PM

We doan need no stinkin' Speedometor....move over and let me drive...

I do expect you to be picking me up at the airport with the RR...weather permitting of course...Yee Haawwww....better leave Paula at home we wouldn't want to scare her to death....heheheheee

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