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Old 09-10-2016, 10:15 PM   #99
clinebarger
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Join Date: May 2009
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Posts: 6,255
Re: 4L80E & TH400 Tech.

Both NP241, NP261 have a VSS sensor, So no need for you to buy a 2wd unit. A 4wd unit & Adapter will fit both T-Cases.

We only use 2wd units when adapting a older T-case that doesn't have a Output VSS sensor.

All GM Output VSS sensors create the same 40 Pulses Per Revolution A/C Sine Wave Signal.
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