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Old 05-20-2021, 07:35 AM   #1
TouringMusician
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Default 1976 M46 OD issue.

1976 M46, OD always worked fine, no visible leaks.

Drove a friend 1.5 hours to the airport, all highway in OD, worked perfectly. Leave the airport, immediately starts slipping into and out of OD, but the OD dash light remains on.

Does the light remaining on mean that the issue is internal to the OD or is that light just wired to the switch on the shifter? It’s the old non relay switch setup.

Thanks!
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Old 05-20-2021, 07:46 AM   #2
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Update:

Got 20 minutes of sweet blissful OD, now back to spastically popping in and out. Jiggled connections to solenoid, no improvement.

Driving home with civic level rpms in the slow lane :-|
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Old 05-20-2021, 10:37 AM   #3
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Check the oil level in the trans. With the light on it means the power is going to the solenoid. With low oil, it will hunt for pressure to engage the O/D
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Old 05-21-2021, 12:49 AM   #4
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Quote:
Originally Posted by 283SD View Post
Check the oil level in the trans. With the light on it means the power is going to the solenoid. With low oil, it will hunt for pressure to engage the O/D
What he said, you might as well give it a full fill of new oil while you’re at it.
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Old 05-21-2021, 10:34 AM   #5
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Originally Posted by c1800 View Post
What he said, you might as well give it a full fill of new oil while you’re at it.
I had that problem once and it was the OD wiring had a break in one of the wires that would short in and out.
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Old 05-20-2021, 12:58 PM   #6
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My guess would be one of the following:
1. The Overdrive may need to be resealed. (The three ports under the OD inspection cover)
2. The solenoid might need to be removed and cleaned.
3. The transmission and overdrive might be low on oil
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Old 05-20-2021, 01:03 PM   #7
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There's also the lockout switch.
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Old 05-21-2021, 03:28 PM   #8
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^^ Had same issue, cleaned and crimped spade connectors and heat-shrinked and wrapped exposed sections, no issues now.
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Old 05-23-2021, 02:25 PM   #9
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Ok, so it’s full of oil, I guess I just need to start tracing wires?

I just was confused about which side of the switch the solenoid and light were on to narrow down my search.

Been a while since I’ve had an m46, but were still using ATF type F in these guys, right?
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Old 05-25-2021, 08:41 PM   #10
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Yes, Type F in there will work fine. Use a test light to check for power to the solenoid so you know the wires carry enough current. There is a short ground wire to ground the solenoid to the overdrive. Make sure that is clean and tight.

PS The shifter wiring can break from all the years of flexing.
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Last edited by dl242gt; 05-25-2021 at 08:42 PM.. Reason: add comment
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Old 05-26-2021, 01:01 AM   #11
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Also, the solenoids themselves can go bad. Has happened a few times to me in the past.
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Old 05-26-2021, 08:33 PM   #12
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With the key on engine off can you hear the solenoid click ? If no click start checking the wiring.
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