A 92 V8 had a A518 series tranny... more specifically a 44RH. Even more specifically a 44RH with "CPS bellhousing and the large fluid lines".
Anyway, the 4th gear is actually a overdrive gear tacked on to the rear of the tranny. For it to engage the computer must make it available (using the selenoid on the valve body) and you must not be in kickdown.
Based on your symptoms, I'd say its external wiring. If it was the selenoid itself, it'd work fine once the tranny heated up. The selenoid has a plug where the wiring connects on top of the pan/valve body on the drivers side. I'd check that connection first for corrosion.
mm
-----Original Message-----
From: srp@cox.net [mailto:srp@cox.net]
Sent: Wed 11/27/2002 9:28 PM
To: dakota-truck@dakota-truck.net
Cc:
Subject: Re: DML: <no subject>
Bad OD unit-- Short in the wiring for it-- something.. That should have the A-518 in it...
Sam
>
> From: "Jon N. Benignus" <blkwidow1@primary.net>
> Date: 2002/11/27 Wed PM 09:57:14 EST
> To: <dakota-truck@dakota-truck.net>
> Subject: DML: <no subject>
>
>
> List,
> My 92 Dak has a slight problem. First a bit of background info.
> When I bought the truck in January, sometimes it would not shift into 4th.
> All shifts were perfect, but no 3-4 shift. It didn't to it very often, but
> maybe once a day. Then it went away comepletely. I can have it in 4th by 35
> mph. It never did it again until the weather got cold again. As it got
> colder, it got worse. Now it almost never goes into 4th. If I play with the
> OD switch enough, I can get it to shift. I have ruled out the switch, as
> when the switch is pushed the torque converter locks and unlocks. Fluid
> level is correct, and fluid is not burned or have any bad smell. Fluid has
> been changed every 24-36k.
> Since I don't have a FSM, or any service book, I thought I'd pose the
> question to the list before I head to the library.
> Could it be time for a fluid/filter change? Is there an external sensor
> which controls the 3-4 shift? I had a 94 Escort which did would not shift to
> 4th and that fixed it. Would disconnecting the battery to clear the computer
> help? I don't know if that unit is computer controlled.
> Drove it to VA two weeks ago and it only occurred once. Otherwise, it works
> flawlessly.
> All answers, suggestions, snide remarks, etc are welcome.
> Unit is an A500.
> TIA,
> Jon
> STL MO
>
>
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