Re: '61 differential dates?
Richard,
Unfortunately I don't have all the numbers for the DANA posi units. But that definitely is a DANA number.
Also, it has a 4.11 gear on it.
Soooooooooo, here is what to look at. If the ring gear is bolted directly to the ring gear flange of the posi unit, then it is a 4-series posi unit. BUT, if there is a spacer plate (about 1/4in thick) BETWEEN the ring gear and the flange, then for sure, it is a 4-series posi unit.
Another thing to look for, as seen in the pictures below, is the outer edge of the ring gear flange. If it is a 3-series posi unit, the edge will have a bevel to it. If it is a 4-series, the edge will be squared off.
Another thing to look at is the depression in the flange for the ring gear bolts. The depressions will be deeper (noticeably) for the bolt heads in a 4-series posi unit than they are in a 3-series unit. See pictures below.
4-series
3-series
Notice the shallower depressions for the bolt heads and the beveled edge of the flange. These two features alone are immediate identifiers between a 3- and 4- series ring gear flange.
Richard,
Unfortunately I don't have all the numbers for the DANA posi units. But that definitely is a DANA number.
Also, it has a 4.11 gear on it.
Soooooooooo, here is what to look at. If the ring gear is bolted directly to the ring gear flange of the posi unit, then it is a 4-series posi unit. BUT, if there is a spacer plate (about 1/4in thick) BETWEEN the ring gear and the flange, then for sure, it is a 4-series posi unit.
Another thing to look for, as seen in the pictures below, is the outer edge of the ring gear flange. If it is a 3-series posi unit, the edge will have a bevel to it. If it is a 4-series, the edge will be squared off.
Another thing to look at is the depression in the flange for the ring gear bolts. The depressions will be deeper (noticeably) for the bolt heads in a 4-series posi unit than they are in a 3-series unit. See pictures below.
4-series
3-series
Notice the shallower depressions for the bolt heads and the beveled edge of the flange. These two features alone are immediate identifiers between a 3- and 4- series ring gear flange.
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