In Car or out of car - Look for a small
metal tag attached to the transmission. On the tag you should find one of the following
1969 - RUG E3 = Wide ratio
1969 - RUG AG = Close ratio
1970 - RUG AV = Wide ratio
1970 - RUG AW = Close ratio
Trans. out of car and no tag - 1) Remove lid
of trans, if the input gear is smaller than the input bearing, it is a Wide ratio. If they
are the same size, it is a Close. 2) Remove the bearing retainer. If it has a groove on
the input shaft it is a Wide, if not, then it is a Close. 3) Put the trans in first gear.
While turning the input shaft, count the number of turns it takes to complete one turn of
the output shaft. If it takes approximately 2-3/4 input shaft turns then the trans is a
Wide ratio (2.78:1). If it takes approximately 2-1/3 input shaft turns then the
trans is a Close ratio (2.32:1).
In Car, no tag - Jack rear wheels off ground, run engine to normal operating temperature.
Put trans. in first gear and let idle steadily, write down speed. Put trans. in 4th gear
and let idle steadily, write down speed. Divide 4th gear speed by 1st gear speed. The
result equals the ratio.
Another method is just about the same except drive the car out on a flat road and again
record the idle speeds in 1st and 4th gears and divide. A tach can also be used by picking
an exact rpm.
2.78 is a Wide ratio and 2.32 is a