Re: [FWDLK] Speedometer gears

[eastern sierra Adj Services <esierraadj@xxxxxxxxx>]

Jim, when I put in my car's former 3.55:1 Sure Grip, and with its then
smaller-than-OEM sized tires, the car's odo was about 19% (IIRC) too
fast (as observed, driving past mile markers).

Dave Homstad told me about a company that makes/sells odometer
'Gizmos',  which  are a small self conatined object, that inserts
between the end of the speedo cable, and the transmission- and  which
adjusts the cable speed to the OEM  odometer specs.

After I replaced the 3.55 with the OEM 3.36 gearset (the 3.55 was
'noisy', got a lot worse highway mileage--like about 10-11--and had only
marginally better performance) ,  installed Diamondback radials, which
are virtually the correct height, and removed the Gizmo, the odometer
began recording  scarily-accurate readings, like within about 1% +/- .

Now, since I've got a 2.76 gears installed, I  find that the odo is
about 13% too slow; the speedo is way too slow, too.

So, if I ever get off my duff, I gotta go get another Gizmo.

BTW, I recall that, when I ordered my Gizmo (you have to tell them the %
of adjustment you need to have them to dial-in to it), you have to tell
them that the trannie-end-fit is the same  as a that for a "Chebbie".

I just can't remember where I bought that Gizmo!---think that they were
in one of the  Frozen Tundra states.

Neil Vedder


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--- Begin Message ---

• From: Jim Ruckdashel <jruckdashel@xxxxxxxx>
• Date: Sun, 17 Feb 2008 18:35:35 GMT

Hi List. I have a 58 Ply with the orginal 3.31 rear gear.(The car had a Powerflite and 318 engine from the factory). I put in a  361engine and CI Torqueflite from a 59 Dod. I have 15 inch Chrysler wire wheels and P215x78-15 tires on them. The speedometer is fast--not sure how much tho. It can show 55-60 when driving along with what I think is 45-50 mph traffic.I think there are speedometer gears that can be changed to get it closer to right. So I have a couple of questions.

What gear should I select; Up or down to slow the speedometer down?

How would I calculate the correct gear ratio?

Where could I find gears to choose from?

How hard are they to change out?

Any help will be appreciated.   Thank.  Jim

Jim Ruckdashel
4241 Singing Post Lane
Roswell, GA 30075
770-992-9746
Jruckdashel@xxxxxxxx

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