Slip yoke eliminator kit / CV driveshaft
- Thread starter freebird2
- Start date
Bounty__Hunter
Super Moderator
Welcome to the Z.
How did they correct the rear driveshaft angle, lower the transfer case with spacers?
If you're not getting any driveline vibes, and the loss in ground clearance doesn't bother you, run it like it is. If you want to make the driveline stronger and get more clearance under the belly skid, install the SYE and CV driveshaft.
Tell us about your jeep, like year, model, drivetrain, etc.
I'm curious as to why the stealership told you not to install a SYE.
How did they correct the rear driveshaft angle, lower the transfer case with spacers?
If you're not getting any driveline vibes, and the loss in ground clearance doesn't bother you, run it like it is. If you want to make the driveline stronger and get more clearance under the belly skid, install the SYE and CV driveshaft.
Tell us about your jeep, like year, model, drivetrain, etc.
I'm curious as to why the stealership told you not to install a SYE.
Bounty__Hunter
Super Moderator
It's the 'correct way' of setting up the rear half of the drivetrain when you lift 3"-4" or higher. They haven't seen much if they haven't seen it done before. I install them all the time.
Jeeper99
New member
I'm surprised they didn't tell you they had the "Correct" parts to "Fix" the problem and that's why they said to not install the SYE. I've done alot of reading, especially on here, and a SYE is definantly the way to go. That is one of the first things I'll get for my future mods when I lift mine.
Bounty__Hunter
Super Moderator
The rear driveshaft is not a CV driveshaft, only the front.
And it's not a true 'CV' driveshaft, just commonly termed CV (constant velocity) when it's actually a 'double cardan' joint at the transfer case end of the front driveshaft, single cardan at the axle end.
When you lift a jeep, the distance between the rear axle and the transfer case becomes greater, requiring a longer driveshaft. The operating angle of the ujoint at each end of the rear driveshaft becomes greater, often at the max constant operating angle. Not good for ujoint longevity.
The SYE replaces the mainshaft and output housing in the transfer case for a much shorter output. The shorter output means a longer driveshaft can be used, thus resulting in less angle at the ujoints. The SYE also converts the slipyoke at the front end of the rear driveshaft to a fixed yoke at the transfer case. The splined slip section is then moved to the middle of the driveshaft. The fixed yoke allows a CV joint to be used.
With a SYE and CV driveshaft, you're required to point your rear axle pinion directly at the transfer case output. This is generally accomplished with adjustable upper control arms, so add that to the cost.
Check out Tom Woods Custom Drive Shafts Custom Driveshafts Specialist for more driveshaft tech from Tom Woods.
And it's not a true 'CV' driveshaft, just commonly termed CV (constant velocity) when it's actually a 'double cardan' joint at the transfer case end of the front driveshaft, single cardan at the axle end.
When you lift a jeep, the distance between the rear axle and the transfer case becomes greater, requiring a longer driveshaft. The operating angle of the ujoint at each end of the rear driveshaft becomes greater, often at the max constant operating angle. Not good for ujoint longevity.
The SYE replaces the mainshaft and output housing in the transfer case for a much shorter output. The shorter output means a longer driveshaft can be used, thus resulting in less angle at the ujoints. The SYE also converts the slipyoke at the front end of the rear driveshaft to a fixed yoke at the transfer case. The splined slip section is then moved to the middle of the driveshaft. The fixed yoke allows a CV joint to be used.
With a SYE and CV driveshaft, you're required to point your rear axle pinion directly at the transfer case output. This is generally accomplished with adjustable upper control arms, so add that to the cost.
Check out Tom Woods Custom Drive Shafts Custom Driveshafts Specialist for more driveshaft tech from Tom Woods.
