Editing TH700R4 through 4L70E tips and tricks (section)
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===Speedometer/speed sensor=== Some GM vehicles (GMT400 trucks, S10s and Astro/Safari vans after 1989, 1990/'91 R/V series trucks (square body SUVs and crew cabs) came with a 40 tooth reluctor wheel (used with a speed sensor and a Digital Ratio Adapter Control (DRAC) module which is matched to the rear differential gear ratio) where the speedometer drive gear is usually located. For older cable driven speedometers, the reluctor wheel can be swapped out. Cable driven speedometers were used to 1990 (B-body) and 1992 (F-bodies) which had a hybrid speedometer gear and VSS housing. This also includes the early 4L60E (1993-97) with the driver side VSS (some 1995 applications with the early design one piece case with the pulse width modulator solenoid (PWM) will have the VSS mounted on the passenger side similar to the 1996+ 2 piece case with bolt on bellhousing).
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