Discussion in 'The Garage' started by 87k10, Feb 23, 2006.
did they make them?
I have always been taught that a 14SF is 33 spline and 14FF is 30.
No, no 35 splines. Like ira said, 33 for sf and 30 for ff
y would a semi floater axle have more splines then a full floater? u would think it would be the other way around right?? crazy ass GM
The 14FF was designed in the late 60s and was in vehicles starting in 73.
The 14SF did not show up until I think 78-79? I would assume that they increased spline count to minimize the strength difference between the 2. .
spline count isn't as HUGE an issue as people make of it. When going from one spline countt o a larger one(say as with 30 to 35 spline stub upgrade on Dana 60) the shafts are often larger. That is the bigger strength gain. Splines help of course. A 16 spline D60 shaft won't be as strong as a 40 spline of course.
If you NEED to have 35-spline in an SF axle, there's always the Ford D60SF.
Moser doesn't say the axle diameter changed, but the torque numbers based on spline count are actually quite different.
Less splines (t-case input for instance) typically result in very deep cuts, (10 spline) which reduces the shaft size quite a bit. More splines (32 spline) result in far less cutting into the shaft itself, plus more engagement of the actual splines.
Bingo. More splines, more faces to spread torque onto, hence, more strength.
Also with the extra load area the cut can be shallower making for a larger minor diameter. That is where the real strenth comes in. A 16 spline shaft can be as strong as a 40 spline if cut the same depth but you would strip the splines. They try to find a happy meduim between snapping shafts and stripping splines.
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