When is it necessary to install a SYE?

[Feralkid]

I just bought 4 inch RC. And new rear driveshaft no sye. I don’t do heavy off road just sand and mud during vacation. Should i buy the sye???

Yes

 

[someguysjeep]

and send the new drive shaft back, if it's got a slip tube for your TC on it. you need a DC driveshaft to mate to an SYE.

 

[TheBoogieman]

This topic always amuses me.