4l60E wont go into 4th gear?? any ideas
09-23-2011, 10:15 PM
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4l60E wont go into 4th gear?? any ideas I have a 1995 z28 with a LS1 Swap and the trans is a LS1 style 4l60E. So bascily its a LS1 car.
I bought the ls1 and it came with a t56 harness and ecm. So I pinned all 13 wires into the pcm connectors and ran the oval a4 plug. So at first the car wouldnt shift out of 2nd gear. (because of the t56 pcm) So I had it flashed for a a4 and now it shifts great but wont go into 4th gear. The torque converter will lock up if I have it in Drive (3) or Drive (4) but wont go into 4th gear. If the shifter is in Drive (3) it works normal with engine braking. But Drive (4) when let off the pedal it goes back down to idle with no engine braking.
What could be a probable cause? I thought of the TPS reading backwards, off or have a bad ground but it checks out fine. Could I just have a bad ground else where?
If it makes a difference the torque converter is a 3,500 Precision Industries Vigilante.
Thanks Curt.
I bought the ls1 and it came with a t56 harness and ecm. So I pinned all 13 wires into the pcm connectors and ran the oval a4 plug. So at first the car wouldnt shift out of 2nd gear. (because of the t56 pcm) So I had it flashed for a a4 and now it shifts great but wont go into 4th gear. The torque converter will lock up if I have it in Drive (3) or Drive (4) but wont go into 4th gear. If the shifter is in Drive (3) it works normal with engine braking. But Drive (4) when let off the pedal it goes back down to idle with no engine braking.
What could be a probable cause? I thought of the TPS reading backwards, off or have a bad ground but it checks out fine. Could I just have a bad ground else where?
If it makes a difference the torque converter is a 3,500 Precision Industries Vigilante.
Thanks Curt.
10-03-2011, 10:15 PM
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mine is completely stock and I just started to have this problem. if I get back on the gas it will go right back up to 2300 RPM at 55mph but when I let off it will drop to like 1500 or so.
01-31-2012, 09:48 PM
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Still wont go into 4th gear. Took off the valve body. All the shift valves move freely. took the servos out and they look fine and put on new seals. Any idea anyone I dont think its wiring cause if it ***** threw 1-2-3 so both solinoids are working. And when I hooking it up to HPtuners its requesting 4th gear.
02-02-2012, 10:42 AM
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Take your servo cover off, the piece that fits into cover is what applies for 4th gear. Make sure it is not cracked! The pressure is applied through the pin then behind that plate and applies 4th gear. Just a thought may be computer but this might be a start
