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On the 1999 Chevy Silverado Z71 4WD, the speed sensor is part of a module. It is located next to the transmission housing.
If it is a k1500, most likely it has the 4L60E transmission.
I have 1999 chevy Silverado z71 wanting to see if a 1994-95 chevy Silverado z71 bed will fit
1/2 tons used the 4L60E transmission. 3/4 Tons used the 4L80E transmission.
mine has 320,000. miles before it started to go out
That would be the 4L60E transmission. The 3/4 tons used the 4L80E
The 2013 Chevrolet Silverado-1500 has a 4-speed automatic.
Take a regular 4x4 Silverado, add skid plates, Bilstein shocks, and Z71 badging, and you have a Z71 Silverado.
The 2013 Chevrolet Silverado-3500HD has a 6-speed shiftable automatic.
The 2013 Chevrolet Silverado-2500HD has a 6-speed shiftable automatic.
It means there is a problem with either one that comes on.
1/2 tons have a 4L60E 3/4 tons have a 4L80E