It appears from your description that it is a clutch operation problem
in that it is not disengaging properly to allow the clean selection of first gear
that amounts to air in the hydraulic system, faulty slave cylinder or faulty clutch master cylinder
unless you have oil on the clutch plate causing it to stick or a dry or seizing spigot bearing in the flywheel( possible ), there is no report from you about a clutch problem( slipping , shudder smelling hot)
At this point replacing both the slave cylinder and clutch master cylinder would be the fix especially if they have not been serviced since manufacture
take it to an accredited brake /clutch specialist shop for diagnosis /quote
some vehicles have the slave cylinder internal in the bell housing (very bad and repair costly manufacturing idea) and if that is your case , the transmission will have to be removed to replace it
should that happen and as the box will be out , it will be cost effective to inspect the clutch at that time
SOURCE: 88 wrangler wont shift
Clutch pedals have a safety interlock switch that keeps a manual transmission vehicle from starting. It sounds like the pin on the bottom of the shifter in the trans is getting worn and needs to be replaced. You can remove the boot on the shifter and the cover on top of the trans and see the pin. It's a simple matter of getting the pin out and installing a new one. Just make sure everything lines up good on the install and everything is clean. Another thing that may be the culprit are the synchronizer plates could be worn nearlt out. To replace or fix this you will need the trans out of the vehicle and tear it down. Start with an inspection of the pin and the linkage as well, then if it doesn't work correctly then you may have to tear into it.
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