bairdmw
New Member
I've got a 4L60E transmission behind a 355 stroker (original VT SS 5.0L) that was running fine, but now I have an issue where I can't get any drive in 4th gear. I can accelerate through 1st, 2nd and 3rd to 100km/h, as soon as i back off, my revs drop back to idle as if the box is neutralising. When I accelerate again, I get drive in 3rd gear at 3200rpm (at 100km/h). I just can't get the box to drive in 4th gear.
The interesting thing is that if I manually shift back to 3rd gear, the box behaves the same under acceleration, but the revs only drop back by 300-400 rpm (ie. it holds 3rd gear on overrun).
I have had the motor in and out a few times lately (replacing the front end) and the only wiring I've changed is the TPS - I re-routed this down the opposite side of the engine loom. I know the TPS is working OK as I can see an accurate throttle position reading when I plug in the laptop.
The trans did sit for 12 months, so I'm wondering if it could be a sticky 3-4 solenoid? I don't know much about autos, so I'm hoping it's an easy fix.
Any idea what could be causing this? TIA!
The interesting thing is that if I manually shift back to 3rd gear, the box behaves the same under acceleration, but the revs only drop back by 300-400 rpm (ie. it holds 3rd gear on overrun).
I have had the motor in and out a few times lately (replacing the front end) and the only wiring I've changed is the TPS - I re-routed this down the opposite side of the engine loom. I know the TPS is working OK as I can see an accurate throttle position reading when I plug in the laptop.
The trans did sit for 12 months, so I'm wondering if it could be a sticky 3-4 solenoid? I don't know much about autos, so I'm hoping it's an easy fix.
Any idea what could be causing this? TIA!