Rear connector is the vehicle speed sensor, the front one is the turbine speed sensor. They are not interchangeable in terms of functions.
The junkyard will provide
- Thread starter 87National
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Correct. Technically the front is the ISS (input speed sensor)....because they are the same style sensor and out of shear laziness, I refer to them both as VSS.
Both are the same sensors via part number, front is ISS on the turbine as mentioned, as well as the rear one if it's on the Transmission picking up the speed of the direct drum. If it's not there it's on the T case or rear diff, just depends on the vehicle. Both are picking up rotational speed and sending it back to the PCM. Nice thing about the 4L80E, them two together calculate slip for the torque management to chip in.
Little Wiring info here that I've done a few times..as well as the tune for them. Been a while but this extra here is the front one if I remember right.
The yards near me all have older "I know what I got," type guys with halos of stale smoke working the counters.
what pisses me off is the "core charge" they put on stuff! seriously? if it doesn't sell they're sending it to the metal shredder not the rebuilder! and if you don't return the core within 90 days, you don't get the money back. just another money grab.
Part Name......................Part Category........Part Price.......Core Price
AXLE ASSY TRK DISC...........AXLES..............$149.93...............$29.56
AXLE ASSY - CAR DISC........AXLES..............$89.61.................$23.09
AXLE ASSY 4X4 FRONT.......AXLES..............$150.58...............$35.10
AXLE ASSY CAR DRUM.......AXLES..............$79.45..................$23.09
AXLE ASSY IND.RR.SUSP....AXLES..............$109.01...............$35.10
AXLE ASSY TRK 8LUG+.......AXLES..............$149.65...............$39.72
AXLE ASSY TRK DRUM........AXLES..............$149.93...............$29.56
Part Name......................Part Category........Part Price.......Core Price
AXLE ASSY TRK DISC...........AXLES..............$149.93...............$29.56
AXLE ASSY - CAR DISC........AXLES..............$89.61.................$23.09
AXLE ASSY 4X4 FRONT.......AXLES..............$150.58...............$35.10
AXLE ASSY CAR DRUM.......AXLES..............$79.45..................$23.09
AXLE ASSY IND.RR.SUSP....AXLES..............$109.01...............$35.10
AXLE ASSY TRK 8LUG+.......AXLES..............$149.65...............$39.72
AXLE ASSY TRK DRUM........AXLES..............$149.93...............$29.56
Those core charges are a scam - plain and simple. Just a way to nickel and dime the buyer.
Built6spdMCSS very nice explanation! I use the tailshaft speed and crankshaft speed in 3rd gear to calculate converter slip. The input shaft (front drum) speed is beneficial to cofirm that the transmission is still working as it t should be.
And how many of those "cores" go to a rebuilder? It's not like back in the day when most parts, to including brake shoes, were redone/rebuilt for resale at the local parts stores.
