Truck will not go into park or reverse

selinoid ? Solenoid Wouldn't think so , but you never know without testing . With the truck running you step on the brake which let's you shift from park into a gear . That part works right ?
Automatic Transmission Shift Lock Control Circuit Description
The automatic transmission shift lock control system prevents the automatic transmission from being shifted out of park position unless you depress the brake pedal with the ignition in run or start. When the ignition switch is in run or start, the current flows from the BU/LPS fuse located in the engine wiring harness junction block through CKT 839 (PNK) to the park/neutral position switch. The park/neutral position switch also feeds the backup lamps portion of the switch. With the transmission in park, the current flows to the automatic transmission shift lock control fuse located in the engine wiring harness junction block through CKT 275 (LT GRN). The current then flows to the stoplamp switch through CKT 584 (LT GRN/BLK). The current continues to the automatic transmission shift lock control solenoid through CKT 1135 (DK GRN/WHT). The ground path is provided through CKT 1850 (BLK) to G203. When you depress the brake pedal, the normally closed contacts in the stoplamp switch open and the current flow is interrupted. When the current flow interrupts the automatic transmission shift lock control solenoid de-energizes. The transmission may then shift to another gear. Once the transmission shifts to another gear (except park), the contacts in the park/neutral switch are open thus stopping the current flow to energize the solenoid when the brake pedal releases.

Automatic trans having overdrive issues - Diesel Bombers

www.dieselbombers.com > ... > 12 Valve 2nd Gen Dodge Cummins 94-98

Apr 22, 2011 - '96 dodge 2500 transmission is having trouble staying in overdrive. ... Hetold me it could be the Throttle Position Sensor, the computer needs ... Oh and another thing, The brake safety for shifting out of park is .... 95 chevy 3500 6.5l trans issues, drgracen, Chevy/GMC 6.2L and 6.5L, 1, 10-05-2015 10:13 PM.


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Jack up the truck and see if brakes are locked.. or just try pushing it if it rolls its probably a trans problem not a brake problem. could be the park prawl is broken in the Trans.

shift solenoid, wiring harness, bad/corroded connectors, trans' control module etc

On the 1995 Jimmy, the shift cable can come loose on the mount on the side of the transmission where the cable meets the trans. When it slips, the alignment goes off and causes the driver to not be able to put the trans into park. If you take a long stick you can push the shift arm on the trans to the park position and your trans will go into park.....what you (and I) really need to know is how to take the shift cable mount apart and reset it.

For Automatic transmission problem,click the link below:----Automatic transmission troubleshooting:---- http://howtobyme.blogspot.com/2011/11/automatic-transmission-will-not-go-into.html---------Automatic transmission shift lever issues?------- http://technoanswers.blogspot.com/2012/01/automatic-transmission-shift-lever-hard.html
-----------AUTOMATIC TRANSMISSION FLUID LEVEL? --

http://schematicsdiagram.blogspot.com/2011/07/how-to-check-automatic-transmission.html

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AUTOMATIC TRANSMISSION FLUID AND FILTER?
http://schematicsdiagram.blogspot.com/2011/07/how-to-change-automatic-transmission.html
-----------Transmission fault light on car dash? http://schematicsdiagram.blogspot.com/2011/12/transmission-fault-light-on-car-dash.html
--------Transmission shifting problem? http://schematicsdiagram.blogspot.com/2012/01/transmission-shifting-problem-on-toyota.html
--------Transmission Slips out of 2nd gear?

http://repairhelpcenter.blogspot.in/2012/02/transmission-slips-out-of-2nd-gear.html

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OD light flashing and transmission fluid leaking?

http://repairhelpcenter.blogspot.in/2012/02/od-light-flashing-and-transmission.html

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Why Transmission fluid leaks near radiator?

http://repairhelpcenter.blogspot.in/2012/02/transmission-fluid-leaks-near-radiator.html

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transmission fluid leaking?

http://technoanswers.blogspot.in/2012/02/ford-windstar-transmission-fluid.html

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****** wont go in reverse?

http://technoanswers.blogspot.in/2012/02/dodge-neon-wont-go-in-reverse.html

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Automatic transmission will not go into reverse? http://technoanswers.blogspot.in/2012/02/dodge-automatic-transmission-will-not.html
----------Transmission is making buzzing noise? http://technoanswers.blogspot.in/2012/02/transmission-is-making-buzzing-noise.html
-----------This will help.Thanks.

Thats not good !
I suggest that the truck be started and warmed up a while.
Then try to drive it around a bit in the yard or where ever.
If that doesnt work out the suspected clog, then I would roll under the truck and look to see if something hasn't eatten away at the wire harness for the trans.

13mm nut on arm on driver side bottom trans pan mash emer brake put shifter in park loosen nut put trans in park tighten nut

yes this is a defective trans, u either have a worn out direct clutch or a hydraulic leak inside the trans, u can try changing the fluid and filter it may help, if not you will need to replace the trans.

check over all enigne mounts
check select cable /linkages
adjust the safety switch