Join Date: Mar 2000
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Re: Spring Over Drive Shaft
You absolutely have to use an SYE if you are running an SOA suspension, and plan to use it off road.
Regular suspension lifts, do not have nearly the range of flex that a well set up, SOA suspension will have, so they can tolerate interim solutions. Bandaid engineering solutions such as dropping the T case, and pointing the pinion yoke on a higher angle, can help reduce vibrations while driving on the highway, but they do not solve the lack of drive shaft, extension travle, needed when the suspension droops.
I have seen quite a few snapped drive lines, busted output shaft housings/bearings, and fractured T case housings, from non believers.
The best kits will not ask for your core shaft as an exchange. The best kits such as AA, Collins brothers, or Tera, will actually supply you with a stronger, hardened shaft, and new rear housing with their kits.
Kits such as Curry's only use the stock shafts, and cut and thread them.
If you are planning to go to a 4:1 kit, and keep the NP231 for a long time, I would suggest a kit such as Collins Brothers, even though they are a bit more expensive.