I have a 88 wrangler with a 4.2. man tranny. Everything is stock. I put a new slave clinder and a new master clutch cylinder. When I start the jeep it wont shift into any gears or its really hard to shift. Once in gear I can drive it with a problem. Also I found out that the jeep can start with the clutch peddle not down???
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Re: 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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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
If you have replaced the slave unit, and bled the system, then I'd replace the master cylinder on the firewall and bleed it again. It seems though that you are a bit week on the diagnostics end...A slave unit is bad only if it is leaking fluid or frozen from non use. A bad master, can either leak externally (usually visible where the rod goes into it on the passenger side of the firewall) or internally bypass causing the slave not to move. The line between them cannot be leaking either or nothing will work. If everything appears to be working but the clutch will not disengage it is possible that the clutch itself is bad.
leaky slave or master cylinder - if you have someone listen to the slave cylinder while you press the pedal is should "squelch" if there is air in there, if the slave cylinder doesn't make a squelching sound then the master cylinder or a hydraulic line between the two cylinders is leaking - slave cylinder isn't very expensive but the master cylinder can be rather pricey. and any good parts shop or motor-factor can source or make-up a new hydraulic line if it is the line itself that is leaking.
Check the clutch master cylinder, the line to the slave cylinder on the bellhousing and the slave for leaks. If fluid is low there is a leak. Master can "bypass" as well similar to a brake master in which case it wont leak but the slave won't move when the clutch is applied. If that system is working then the clutch likely has worn out.
check make sure the clutch master cylinder working properly along with slave cylinder. both master and slave don't have to leak fluid to be faulty, the rubber seal inside the unit could be worned and when apply pressure the fluid blow by or seep between the rubber seal causing the the unit not to work properly giving you a weak feel and pressure at the pedal. both unit have to work properly in sync. if one are weak you will have the same issue. clutch should have a good tight feel not sloppy or weak. pressure plate will also play important role, weak pressure plate will also give you a weak pressure feedback from the foot pedal and also will cause the synchronizer in the transmission not to engage and work properly. check this basic item fist before messing with your tranny. clutch master and slave cyc are fairly cheap to fix and replace.