Originally Posted by fabricator
a crankshaft spacer, not a sensor. ls motors crankshaft doesn't stick out as far as older smallblocks, so you need a spacer if you run an older transmission.
Yup. In fact, on a lot of 6.0/4L80e combos had that spacer as an OEM piece, because they didn't make a longer snout 4L80e.
Make sure you get the longer crankshaft bolts as well to go with it.