Trans... break! 4l60e

[JNJchev77]

Daily driver was low on fuel, so I decided to take the truck to work this morning.

Cruising about 65-70mph on the highway and then all the sudden it revs weird and down shifts, then down shifts again. Luckily I was able to safely pull over as there wasn't much traffic. I slowed to about 25mph and was able to keep moving to the off ramp. Then the truck shut off?!

Fire's right back up and moving again. As I'm heading back home I decide to give it some gas, get up to fourth gear and it's fine for a few seconds, then the same thing happens. Truck accelerates fine through the gears...

I notice when I hit a significant bump in the road that's when things kind of go haywire with the shifting and I can hear some minor clicking/clunking coming from the trans tunnel area. I was able to limp home, but haven't been able to scan anything yet... Any ideas? Did I lose the tranny??

Here are some specs:
'03 5.3 with Z06 cam/springs
Aftermarket Computer - Street tuned by local shop
4l60e was rebuilt by AAMCO, stock rebuild - mileage is exactly 1000.
I replaced the harness in the trans along with the 1-2 shift solenoid a couple hundred miles ago and haven't had any issues up until now.


I had a shift problem in the past that was a fuel related issue, but have since solved that issue. The truck would not shift from 1-2 at WOT because it wasn't getting enough fuel. Bad pump and clogged line were the culprits.