Manual Transmission T56 | T5 | MN12 | Clutches | Hydraulics | Shifters

Reverse lockout not blocking gate

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Old May 1, 2021 | 02:27 PM
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Default Reverse lockout not blocking gate

Thought I'd get some input before digging too far into this problem. T56 reverse lockout is not blocking the gate. I keep walking into reverse when shifting to 5th on the highway. Today I got in far enough that it ground teeth.

This is a Holley EFI where I provide +12V to solenoid when (mph > 5). The +12V ECM driver is tripping on/off properly in datalogs. I haven't spooned into the circuit to measure actual voltage but the datalog is probably believable.

I always thought the native state of the solenoid is to block the gate and the solenoid had to have voltage to open the gate. Do these things sometimes mechanically break and lose ability to block the gate?

I'm fixin' to remove the solenoid and possibly replace, but some input from experienced people always helps. Thanks.
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Old May 1, 2021 | 04:41 PM
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On my TR6060 12+

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Old May 1, 2021 | 06:46 PM
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Yeah, I know how to do the software. Been driving it for 5 years. More interested in insight about how the solenoid could fail with the gate open
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Old May 1, 2021 | 11:28 PM
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Originally Posted by QwkTrip
Yeah, I know how to do the software. Been driving it for 5 years. More interested in insight about how the solenoid could fail with the gate open
They can fail either way, When they fail open it's likely a broken return spring or something came apart not letting the solenoid return to it's resting position. The solenoid when energized pulls and when not energized it uses a spring to return to the original position.
Edit: This video might help.

Last edited by LLLosingit; May 1, 2021 at 11:39 PM.
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Old May 1, 2021 | 11:33 PM
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Ah, okay, so it's not all that unusual then. That gives me a little more confidence to dig into the solenoid. Thanks.
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Old May 2, 2021 | 12:09 AM
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Good video! Thanks for adding that.
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