While I was under the 76 playing with the brake hose, I got to thinking (I
know - shouldn't do that) about the final drive. Why are my rpm's so high
at 50 mph (about 3400). If my final drive is 17.3 mph per 1000, then I
should be flying down the road at almost 60 (58.8). Anyway. I was also
told it sounds like a 4.22 diff is installed (about 15 per 1000) So I looked
up an old driveline info section and was read - To determine final drive
ratio, raise one wheel, mark driveshaft, mark wheel, rotate wheel one (1)
revolution and count driveshaft revs. (3.9 = 3.9, 3.7 = 3.7, 4.2 = 4.22).
Ok easy enough.
There must be something wrong or I can't follow instrucitons. My drive shaft
rotated exactly 1.95 revs (not quite 2 and more than 1.9) per wheel
rotation. What am I doing wrong? Is there anyway short of pulling apart
the diff to determine what is inside?
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