First the important stuff.
1993 C1500. 2WD. 4L60E.
Trans was rebuilt about 1-2 years ago. Has run beautifully so far.
I developed a leak, and went on an incredible snipe hunt trying to eliminate it. Long story short, I've had the trans out of the truck about 6 times now. Finally found a nearly impossible to see leak in a torque converter weld. Got a new converter, leak stopped.
The time before last (5th time), when I had put it back in, I noticed it wasn't shifting out of 1st. I attributed it to (probably) low fluid, and ignored it as the leak had my attention. Put it back in the shop and pulled it again. (for the 6th time) when I found and fixed the converter leak, and reinstalled.
It still won't shift out of 1st (details to follow). It had never done this before. I think I may have damged an electrical connection during my repeated pull / installs.
Truck takes off fine in 1st. Won't shift unless you wind it way up, and then let completely off the throttle. If you accelerate up further it will be fine for a bit, then starts cutting in and out. Like it's jumping between gears. DOES NOT FEEL GOOD. Don't want to replicate. If you take off in low, you can't manually shift to second. I didn't try shifting it into OD to see if I could coax a shift out of it.
I've double checked the trans fuse.
I visually searched the harness and can find no broken or exposed wires.
I checked the VSS plug and wires as well. Also, speedometer works fine.
I pulled the round main plug, and looked it over, but saw nothing out of place. Hard to see though.
I did take the pan off around the 3rd or 4th time I pulled the trans to replace the front pump gasket. It shifted fine after that, the problem seems to have developed later on.
I still need to get an inspection mirror so I can see into the main plug socket. Maybe I broke / bent a pin.
Question 1. What circuit or part could cause these symptoms if it dropped out of normal operation.
Question 2. Is there a procedure / check list to pull the pan off and check the wiring with a multimeter? As in, this wire should be ground, that one should be 12v, these should be *** ohms?
1993 C1500. 2WD. 4L60E.
Trans was rebuilt about 1-2 years ago. Has run beautifully so far.
I developed a leak, and went on an incredible snipe hunt trying to eliminate it. Long story short, I've had the trans out of the truck about 6 times now. Finally found a nearly impossible to see leak in a torque converter weld. Got a new converter, leak stopped.
The time before last (5th time), when I had put it back in, I noticed it wasn't shifting out of 1st. I attributed it to (probably) low fluid, and ignored it as the leak had my attention. Put it back in the shop and pulled it again. (for the 6th time) when I found and fixed the converter leak, and reinstalled.
It still won't shift out of 1st (details to follow). It had never done this before. I think I may have damged an electrical connection during my repeated pull / installs.
Truck takes off fine in 1st. Won't shift unless you wind it way up, and then let completely off the throttle. If you accelerate up further it will be fine for a bit, then starts cutting in and out. Like it's jumping between gears. DOES NOT FEEL GOOD. Don't want to replicate. If you take off in low, you can't manually shift to second. I didn't try shifting it into OD to see if I could coax a shift out of it.
I've double checked the trans fuse.
I visually searched the harness and can find no broken or exposed wires.
I checked the VSS plug and wires as well. Also, speedometer works fine.
I pulled the round main plug, and looked it over, but saw nothing out of place. Hard to see though.
I did take the pan off around the 3rd or 4th time I pulled the trans to replace the front pump gasket. It shifted fine after that, the problem seems to have developed later on.
I still need to get an inspection mirror so I can see into the main plug socket. Maybe I broke / bent a pin.
Question 1. What circuit or part could cause these symptoms if it dropped out of normal operation.
Question 2. Is there a procedure / check list to pull the pan off and check the wiring with a multimeter? As in, this wire should be ground, that one should be 12v, these should be *** ohms?