Re: [FWDLK] Speedo adjustment..?

[Jim Pristelski <ajp002@xxxxxxx>]

Hi Dave,

You are correct that the speedometer cable output at the back of the tranny
measures the rotations of the driveshaft.  If you modify anything in front
of the speedometer output, like the tranny gears, nothing changes.  However,
if you change anything in back of the speedo output (rear end gears, tire
size, etc.), you can expect the speedometer to change and give inaccurate
readings.  To accommodate the different rear ends, tire sizes, etc used on
the different automobiles, Chrysler Corp used different speedometer gears to
drive the speedometer cable.  These gears are typically some form of plastic
and come with differing numbers of gear teeth on them.  They are frequently
different colors so that they didn't have to count the number of teeth on
the assembly line -- just get a green one, an orange one, etc for the
correct gear ratio to make the speedometer reading correct.  These gears
sometimes appear on ebay.  They are probably available from some of the
parts vendors too.  Best regards, Jim


-----Original Message-----
From: Forward Look Mopar Discussion List
[mailto:L-FORWARDLOOK@xxxxxxxxxxxxx]On Behalf Of David Charles Gedraitis
Sent: Friday, February 08, 2002 11:04 AM
To: L-FORWARDLOOK@xxxxxxxxxxxxx
Subject: [FWDLK] Speedo adjustment..?


Hi list,

As is my understanding, a speedo merely measures driveshaft speed and
relays said info to the driver. So what does one do if you change your
transmission/rear end gears?

~dave
'61 newport
'67 Kaiser M-715
'91 Toyota Pickup

Hemi: (hem -e) adj. Mopar in type, V8, hot tempered, native to the United
States, carnivorous, eats primarily Mustangs, Camaros, and Corvettes. Also
enjoys to smoke a good import now and then to relax.

-- -- -- -- -- -- -- --
Calendars are still available.  Don't miss the chance to get yours now!
Details for ordering may be found at:
http://www.forwardlook.net/calendar2002/index.html

-- -- -- -- -- -- -- --
Calendars are still available.  Don't miss the chance to get yours now!
Details for ordering may be found at:
http://www.forwardlook.net/calendar2002/index.html