VSS Modification for NP205 Transfer Cases

With modern drivetrain swaps becoming ever more popular, we've come up with a way to modify the bulletproof NP205 to support the electronic vehicle speed sensor that modern computers require.

This modification gives the 40 pulse-per-revolution output that 1988 and newer GM computers look for to drive the speedometer and control shift timing on automatic transmissions.

This is also an important feature on Gen III+ motor swaps (even with a manual transmission), as they can be tempermental without a VSS.

Basically, you send your speedometer housing to us and we'll machine it flat and at the correct depth and tap it for the VSS.  We also supply a new tone wheel that replaces the plastic speedometer gear on the 205 output shaft (you will lose the cable speedometer drive).  We also supply a new speed sensor and pigtail.

There are two versions of NP205 fixed yoke style rear outputs, you will need the later (and far more common) version that is splined for the speedometer drive gear, pictured at the right below. Note the two shafts in this picture, the one on the left is the early (rare) version that only has one row of splines and doesn't work.

Includes machine work on speedometer housing, new 40 pulse tone wheel, plug for OE speedo hole, new sensor with pigtail and required gaskets

Speedometer housing must be clean and needle bearing removed

UPS, Fed Ex and USPS will all deliver to us. Make sure to pack and tape up the package securely! Include a note in the package with your name/number so we know who the knuckle is from.

Return shipping will be calculated at checkout

Typical turnaround time is 2-3 days


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