calculating driveshaft length
#1
calculating driveshaft length
Ok so im putting a th400 w/ 9'' tailshaft in w/ a stock rear end.
now stock driveshaft length is 40.5''
4l60e length is about 31''
th400 length is about 34''
from the stock dimensions that equals 71.5''
31+40.5=71.5
now for the th400 couldnt i just use
34+X=71.5 which is of course 37.5''
now going off that how accurate is that? I dont really feel like putting the th400 up in there just to figure out what I already can figure out on paper.
What sizes DS have you ordered for a th400 swap with stock rear end? should I just get one 2'' shorter?
now stock driveshaft length is 40.5''
4l60e length is about 31''
th400 length is about 34''
from the stock dimensions that equals 71.5''
31+40.5=71.5
now for the th400 couldnt i just use
34+X=71.5 which is of course 37.5''
now going off that how accurate is that? I dont really feel like putting the th400 up in there just to figure out what I already can figure out on paper.
What sizes DS have you ordered for a th400 swap with stock rear end? should I just get one 2'' shorter?
#4
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one way to measure for a shaft is to jack the rear up as it would be sitting at ride height, then measure from the rear seal of trans to the center of rear u-joint. take that measurement to the shop. they can figure out the slip it needs from there.
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another way to measure for a driveshaft if you have the slip yoke. put the yoke all the way in till it bottoms out, then pull it back out 3/4-1 inch then measure from center of where the ujoint should be to the center of the rear yoke.then you have center to center of u-joint.i worked for a driveline shop, made many shafts. the rear end has to be at ride height also.
#6
If we are supplying you with transmission slip yoke, pinion yoke and driveshaft yoke measure Dim W.
If we are supplying you with transmission slip yoke and driveshaft measure Dim X.
2 Piece driveshafts use Dim Y + Z.
Hope this helps. Bob