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Getting there

R

RustyRed

Active Member
Finally got a chance today at lunch to take the Mustang around the block with the new 3rd member with the posi 3.55 gears. The weather has not been very cooperative the last couple of weeks.

Pretty decent improvement off the line. All push and less wasted energy from what I can tell. Still not running a 10 second quarter or anything along those lines but improvement none the less and I wasn't attempting to run the quarter in the first place.

The only issue I have now is the speedometer is still reading about 15 mph fast. Before I started the car had an 18 tooth gear in it. I had purchased a 20 tooth that I am betting is the correct one from John's Mustang here in town.

The problem is the gear coming out of the car is different. It's longer, etc. I am wondering is it possible that someone has swapped out the speedo cable through the years?

The gear I bought from John's just flat isn't going to attach to the cable that's in the car. A new stock style cable is only about $20 at CJ so I am thinking maybe I should trade out the cable in the car for a new one that is correct for a '66?
 
You know you can get speedo cables from your local parts stores, I got mine at O'reilly. Usually a couple bucks cheaper than the mustang places. Did you use one of the speedo gear calculators? If your running a 15 or 16 inch tire, your different from the stock setup.
 
"Fast68back" said:
You know you can get speedo cables from your local parts stores, I got mine at O'reilly. Usually a couple bucks cheaper than the mustang places. Did you use one of the speedo gear calculators? If your running a 15 or 16 inch tire, your different from the stock setup.
Click to expand...

I ran it through a couple of different calculators and came up with 19 point some odd teeth on the two I used.

Hadn't thought to check at O'Reilly (sp?) but I am wondering if that isn't part of the issue why the 20 tooth gear I purchased from John's doesn't want to hook to the cable I have. The old gear and new one are pretty different.

In the short term, I get to drive 15 mph over the speed limit :rofl
 
Just for fun here's a picture of the old gear and the new one John's sent side by side.

The new one is the white one on the right.

Maybe I am stupid (ok, don't answer that...) but the new gear doesn't want to attach to the old cable in the car and thinking they look pretty different.


<img src="http://www.stangfix.com/testforum/gallery/5/129_09_07_10_1_03_45.JPG" />
 
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