Front driveshaft direction?
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Fleet Mechanic
Joined: Jun 2011
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From: Southern California
Front driveshaft direction?
So when i went to look at my truck b4 i bought it, the owner had taken the front shaft off. I have a feeling he put it on backwards.lol Anyone have a pic of it in the correct direction? 1974 F250 4x4
Post Fiend
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From: Big Sky Country
When the suspension cycles up and down the drive shaft must be able to both extend and compress to accommodate this movement, hence the slip yoke.
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When your suspension cycles in and out, the axle moves closer and further away and moves the r&p closer and further away from a fixed point, being the transfer case. You need a way to allow that movement in the drive shaft, hence the slip shaft.
And I believe there is S twist in the springs translated to the axle that changes the ring and pinion angle, and that in turn changes the length difference between the xfer case and the front axle.
The slip yoke allows for that length to change and still have power via the drive shaft applied to the front axle. That's why you have a rear slip shaft too, get it?
The short and long version......lol.
And I believe there is S twist in the springs translated to the axle that changes the ring and pinion angle, and that in turn changes the length difference between the xfer case and the front axle.
The slip yoke allows for that length to change and still have power via the drive shaft applied to the front axle. That's why you have a rear slip shaft too, get it?
The short and long version......lol.
Last edited by 77&79F250; Dec 20, 2011 at 10:55 PM. Reason: Me and Mont HB were typing at the same time.
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Fleet Mechanic
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From: Southern California
Duh. I shoulda got that one my self haha. Now how big of a suspension lift can i go without getting a new shaft? Cuz since it would be taller, couldnt i max out the slip yokes extension length?
Post Fiend
Joined: Apr 2008
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From: Big Sky Country
Exactly, generally speaking you can get away with about 3-4" of lift before you need to lengthen the drive shaft.
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2" All day long FoMoCo brother.....
Crazy tall and super flexy lifts without new length d/s can get you into a possibility of over extending you slip shaft and it coming apart ='s bad day.
Crazy tall and super flexy lifts without new length d/s can get you into a possibility of over extending you slip shaft and it coming apart ='s bad day.
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Joined: Feb 2007
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Keep in mind those slip yokes need maintenance like a u joint. Well maybe not quite as often, but at least a shot of grease every now and again.
Does yours have a grease zerk on it?
Does yours have a grease zerk on it?