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Old 02-20-2020, 11:34 AM
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kelseydum kelseydum is offline
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Default Daily driver trans or electrical issue?

2004 Tahoe z71 5.3 4x4: will not shift out of park. Shift interlock solenoid seems to be working. Shift lever works and can disconnect shift cable at trans and shift by hand well but itís like it wonít engage gear. Happened a couple times randomly then just suddenly wonít do anything. Rear end is not locked up. I have had a leaking hydro booster for a while but I make sure to keep fluid in the steering pump. Can an air bubble in the hydro boost lock it up?... or neutral safety switch... speed sensor etc...? Iíve also seen right inside the trans gear selector thecable with a spring can break. Iím about to pull the neutral safety switch and see if anything is broken there. Really hoping itís not that flange on the sun shield thatís broken. Saw that is common with the 4l60e.

Thanks in advance.
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Old 02-20-2020, 11:37 AM
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A buddy mentioned unhooking one of the trans cooler lines at the radiator and see if itís pumping fluid. Does vehicle need to be started when I do this?
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Old 02-20-2020, 12:25 PM
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Quote:
Originally Posted by kelseydum View Post
A buddy mentioned unhooking one of the trans cooler lines at the radiator and see if it’s pumping fluid. Does vehicle need to be started when I do this?
Yes, it has to be running. You'll get fluid fast and hard like a fire hose! I wouldn't do that. One of the other issues you mentioned is more likely.

Hydro boost has nothing to do with your trans.

Neutral safety, not likely.

Speed sensor, also not likely.

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Old 02-20-2020, 12:43 PM
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Thanks. Is there a better way to make sure the fluid is getting pumped whether itís a torque converter, pressure manifold or sensor issue? I would like to at least know fluid is flowing and rule that out.
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Old 02-20-2020, 12:50 PM
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I might add that fluid level is good, no burnt smell or debris and no check engine light or codes showing.
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Old 02-20-2020, 12:57 PM
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You said you can disconnect the shift cable at the trans and shift by hand, but it won't engage. Did you mean you then shifted the trans by hand? So is something still holding up the column side of the shift?
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Old 02-20-2020, 12:59 PM
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Have you tried 4WD?

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Old 02-20-2020, 01:08 PM
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If the lever will move and you can't feel the detente of the tranny going through the gear selections then, it sounds like something in the tranny has come loose or has broken.
With the engine running, can you feel the tranny engage or not.

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Old 02-20-2020, 04:31 PM
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Snopro,
I unhooked the cable from the trans gear selector on the side of the trans so the shift lever and any electronics (or most electronics) should not have a factor.

Crank,
Yes sir I tried 4x4 as well.

Old iron,
Itís weird. Yes I can feel, hear and see the transmission ďengageĒ the engine idle changes as if Iím in gear, and you can physically see the vehicle move an inch forward and backward but it stops as if it went back into park (not neutral because the vehicle wonít move even when I hit the gas).

I did disconnect the cooler line in front of the radiator and had my buddy start the truck and itís definitely pumping fluid.
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Old 02-20-2020, 04:34 PM
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Donít know if I mentioned it but I even dropped the rear drive shaft to make sure the rear end wasnít locked up.
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