NP231 Slip Yoke Eliminator + Tom Woods Driveshaft: What It Is, Why You

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NP231 Slip Yoke Eliminator + Tom Woods Driveshaft: What It Is, Why You Want It, And What It Fits

by: Scott Brayshaw -

If you’ve lifted your Jeep and picked up driveline vibration, you’re not alone. The stock slip yoke on the back of the transfer case can’t handle the steeper angles that come with a lift. The solution is a Slip Yoke Eliminator (SYE) and a CV driveshaft — and we’ve got the best combo right here at Rusty’s.


We offer the Advance Adapters SYE Kit paired with a Tom Woods double-cardan driveshaft, giving you everything you need for a smooth, reliable driveline upgrade. Rusty’s handles the whole order process for you — one call, one shipment, and everything fits like it should.

Advance Adapters - Advance Adapters NP231 SYE & Tom Wood 1310 Series CV Driveshaft


Why Rusty’s Offers This Combo

After 45+ years of building, testing, and selling Jeep parts, we’ve seen what works and what doesn’t.

  • Advance Adapters builds one of the strongest and most proven SYE conversions on the market.

  • Tom Woods Custom Driveshafts has been a top name in the business for decades, known for precision-balanced shafts and quick turnaround.

By combining these two brands, Rusty’s customers get the perfect match of strength and performance — all backed by our experience and customer support.

What Vehicles Use the NP231

The NP231 “Command-Trac” transfer case came in:

  • YJ Wrangler

  • TJ Wrangler

  • XJ Cherokee

  • MJ Comanche

  • Some ZJ Grand Cherokees

If your Jeep runs the NP231, this package is made for you.

We also offer an NP242 SYE Kit for Jeeps running the “Selec-Trac” full-time 4WD system. Same idea, same benefits — smoother driveline, better angles, and a stronger setup.

Why Not Just Drop the Transfer Case?

A quick transfer case drop might mask vibrations for small lifts, but it’s not a long-term fix. Once you’re over about two inches of lift, a proper SYE and CV shaft setup is the only real solution.

You’ll get:

  • A stronger fixed-yoke output shaft

  • A longer, smoother driveshaft

  • Better operating angles

  • More suspension travel and flex

  • Less vibration and noise

It’s the difference between patching the problem and solving it.

Image from Tom Woods Driveshaft

How Ordering Works at Rusty’s

  1. Order the SYE + Driveshaft Package.
    We’ll ship the Advance Adapters SYE kit right away.

  2. Install the SYE and set your rear pinion angle.
    Keep the Jeep sitting on its own weight.

  3. Take your measurement.
    Measure from the transfer case yoke to the axle yoke.

  4. Call Rusty’s with your number.
    We’ll work with Tom Woods to have your custom driveshaft built to the exact length you need.

Tom Woods usually ships within a few business days once we send them your specs. Everything goes through Rusty’s, and we’ll keep you updated until your shaft arrives.

A Few Notes

  • All driveshafts in this package come with 1310 U-joints.

  • Some 1994–1995 YJ models use a 1330 joint at the axle — those will need our HD35Y yoke for proper fit.

  • Driveshafts over 36 inches long require larger tubing and add an $85 upcharge.

Quick Takeaway

  • Fixes driveline vibration after lifting your Jeep

  • Combines trusted names: Advance Adapters + Tom Woods

  • Fully supported by Rusty’s from order to install

  • Fits YJ, TJ, XJ, MJ, and some ZJ with NP231

  • NP242 option available

  • American-made quality parts tested and trusted worldwide

If you’re not sure which transfer case you have or need help measuring, give us a call. We’ve been doing this long enough to get you set up right the first time.