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For the Double Cardan (CV) drive shaft we have three options available. Upgraded heavy wall tube larger/stronger slip yoke & spline stub (S Spline) Or the top of the line shafts with the longer travel slip & spline XC or XB Spline
Of course, these would be built with “Gold-Seal" universal joints. For long term value, We consider the top of the line shaft to be the best value.
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The S spline is a conventional spline stub that will yield a safe, effective and usable stroke of 3”. The X spline is longer than the S spline. The X spline is cut for the full length of the spline stub. This gives a bit more than twice the contact area between the slip yoke and spline stub and a stroke of 4-1/2". This in and of itself will net more than twice the life on these two components.
With the XB configuration, we will use a heavy rubber boot which is banded down with stainless steel banding to seal all of the contaminates out and keep the grease in. The XC configuration uses the same slip yoke & spline stub but instead of using the rubber boot, we drill and tap the slip yoke for a grease fitting and use a dust cap which has convolutions that follow the spline stub for sealing. We consider the XB configuration to be the longest lasting and best value |
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How To measure for 97-06 TJ Wrangler drive shaft without slip yoke installed

Jeep must be on flat ground when taking this measurement |
How To measure for 87-95 YJ Wrangler drive shaft without slip yoke installed

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If you have substantial lift and want the smoothest drive shaft, we suggest one of the Slip Yoke Eliminator (SYE) kits along with a double cardan (CV) drive shaft.
With this system you should be able to keep your transfer case at stock height but you need to be sure to pitch your differential so the pinion points directly at the out-put of the transfer case to maintain minimal joint angle at the differential end.
All Slip Yoke Eliminator Kits |
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How to measure if you already have a slip yoke installed or for front drive shafts

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