Cruising on Freeway set at 70mph'ish and going up a steep grade, about 2/3 the way up RPM's go all over the place, the entire rig shakes violently, and check engine light comes on.
Reach the top of the hill, RPM's settle, check engine goes off, and I stop swearing.
Next hill, 2/3 the way up...same shimmy, RPM's and check engine light. This has only happened climbing steep grades with cruise control set.
It's a 5.9 with a 46RE tranny, is this the lockout/up? It never down shift into a lower gear, though it was pulling up the hill with ease.
Reach the top of the hill, RPM's settle, check engine goes off, and I stop swearing.
Next hill, 2/3 the way up...same shimmy, RPM's and check engine light. This has only happened climbing steep grades with cruise control set.
It's a 5.9 with a 46RE tranny, is this the lockout/up? It never down shift into a lower gear, though it was pulling up the hill with ease.