Lil'John
11-13-2002, 02:12 PM
I'm curious if there is a point at which a driveshaft is too long and starts to fawk up the tcase and pinion bearings?
I was reading through a shop book for another vehicle and they mentioned something about fawking up the transmission bearings because of removing the carrier bearing.
Anyone? Jesse?
bignissan
11-13-2002, 02:16 PM
with a long d-shaft, you begin to get shaft whip..if i understand correctly, the shaft doesn't spin in a perfect circle due to the u-joints and angle, the faster the shaft spins, the more "whippy" it becomes and more so on a long shaft, especially on a light weight shaft. someone can probably explain it better. i don't think there is a set length that is "too long" it depends on application and material the shaft is made out of.
greg
crashinaz
11-13-2002, 03:04 PM
Originally posted by bignissan
with a long d-shaft, you begin to get shaft whip..if i understand correctly, the shaft doesn't spin in a perfect circle due to the u-joints and angle, the faster the shaft spins, the more "whippy" it becomes and more so on a long shaft, especially on a light weight shaft. someone can probably explain it better. i don't think there is a set length that is "too long" it depends on application and material the shaft is made out of.
greg
PFFFFFFFF!!! You said "SHAFT WHIP"... :D
Lil'John
11-13-2002, 03:36 PM
Hmmm.... interesting theory. Never heard of that problem before.
The reason I'm a bit concerned is because I have a driveshaft that is going to end up being somewhere between 40 and 50 inches long... I don't have an official measurement because I don't have the drivetrain in yet:(
bad booger
11-13-2002, 04:02 PM
It will be fine, if you are concerned and or it is your daily driver put a cv joint on the tcase end point the pinion at the tcase and it will be fine
bignissan
11-13-2002, 07:29 PM
40-50 inches isn't bad at all....it's mainly for the 4 door one tons that have gotten rid of the carrier bearing in place of a one piece for possible driveline relief of tall lifts....it's very uncommon, but that is one reason why they make the shafts 2 pieces.
greg
LeviGarrett76
11-13-2002, 11:42 PM
yea, its fine....the stock shaft in my 79 250 was a little over 50 inches
patooyee
11-14-2002, 07:51 AM
In the off-road world there's another problem with shafts that are really long that I am personally going to have to deal with soon.
My front shaft is REALLY long because I have 2 t-cases and an auto tranny. If my d-shaft is one-piece, it is going to hang down below the frame WAY too early and be dragging on the rocks every time my frame drags. That is why I'm probably going to end up with a 2 piece front shaft. Granted, I'll lose gain a small amount of angularity, but it won't be too bad. My shaft would end up being around 50", too if it were 1-piece.
J. J.
bignissan
11-14-2002, 09:02 AM
that is a problem with mine right now, a bit long in the front due to the dual cases. i'll eventually end up with a two piece...
greg
hewl35
11-14-2002, 09:50 AM
Originally posted by Lil'John
I'm curious if there is a point at which a driveshaft is too long and starts to fawk up the tcase and pinion bearings?
I was reading through a shop book for another vehicle and they mentioned something about fawking up the transmission bearings because of removing the carrier bearing.
Anyone? Jesse?
My front driveshaft will be in the neighbor hood of 67+ inches. Jesse told me me I could run a one piece but he would recommend a two piece for two reasons:
1. Too much hanging down
2. Harpooning the transfer case on the first rock.
I think I'll be taking his advice on this and run the two piece.
Call Jesse he's a great guy and loves to talk about our toys.