Quote:
Originally Posted by blazerbrad
Sounds like the issue is because it does not know the t-case is in 4 low.
With the speed sensor on the trans lets say that when in high range, third gear (1:1) in the trans, and 2,000 engine rpm the speed sensor sends out a signal that equates to 45 mph. You now shift into low range, third gear in the trans, and 2,000 engine rpm and the speed sensor sends out the exact same signal and makes the ECM think you are still going 45 mph. However since the t-case is in low range the vehicle is actually only going about 16 mph (2.72 times slower...or about 3 times).
Do you still have the VSS on the tailhousing of the t-case that you could hook up?
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this is what i was saying, he just said it better.
your Vss is before the gear reduction of the t-case so therefore the speedo is not accounting for the 2.72:1 gearing of the T-case when in low range. IMO use the VSS for the T-case and you should be just fine.