Dick yo are correct. The easier way yet is to raise the vehicle. Block
1 wheel so it can't turn. Mark the driveshaft adn the other whee./
Rotate the driveshaft, counting turns, until youget 1 full turn of the
wheel. Multiply the dirveshaft turn count by 2 and you have ratio.
Example - a not quite 2 turns of the driveshaft is a 3.7, 1 3/4 turns is
a 3.45 adn justover 2 turns is a 4.1. This will work for any open diff
but willnto work with awelded or limited slip. Ted
Sally or Dick Taylor wrote:
>List---Someone had asked how to tell if he had the 3.70:1 ratio, without
>removing the cover and counting teeth. I later received a message
>suggesting that this ratio could be found by "turning the prop shaft and
>marking the tire". If I understood him correctly, the propshaft should
>turn 3.7 turns for one full turn of the tire. I asked if he wanted to
>share is with the list, since it seemed to be worthwhile information.
>Seeing nothig further on this to the list, I checked this theory with a
>spare diff, known to be the standard 3.7:1. Here's what I found:
>
>One turn of the prop shaft (flange) was equal to 195 deg. of axle flange
>(or tire) rotation. The other gears in the diff upset a direct
>relationship of 3.7:1 when trying to use the tire, and the math here is
>too fuzzy for me to figure out.
>
>Still, it can be determined if you have the std. 3.7:1 ratio without
>mounting a degree wheel. Put a mark on both the prop shaft and tire and
>turn the prop shaft exactly 24 times. The "tire" will turn exactly 13
>times and both should end up on their marks.
>
>One rear tire should be on the ground to do this check, to be sure the
>other side always turns.
>
>If I missed a more obvious way, I'd be interested to know.
>
>Dick
>
>
>
--
Ted Schumacher
tedtsimx@bright.net
http://www.tsimportedautomotive.com
108 S. Jefferson St.
Pandora, Ohio, USA
Fax: 419.384.3272 (24 Hrs.)
Phone: 800.543.6648 (US & Canada)
Tech/ Gen. Information/ Worldwide: 419.384.3022
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