4wd wouldn't engage could it be the transfer case? - Jeep Wrangler Forum

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Old 01-10-2017, 02:25 PM
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4wd wouldn't engage could it be the transfer case?

I just bought a 1991 jeep YJ and it won't shift into 4 wheel drive.

I got under there and had a look around it looks a blot has come off the linkage from the shiftier to the transfer case. basically there is a rod sliding freely through a bracket.

I tried shifting it by hand but I was unable to move it's kind of hard to get leverage down there.

So my question is if everything is working down there should I beable to easily move it by hand, it may have been a least 3years before anyone tried shifting it to 4wd before me. thanks!
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Old 01-10-2017, 03:12 PM   #2
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I have never tried to shift my TC without the shifter so I am unaware of how much effort is required to do so.

Why don't you simply tighten the bolt that's on the bracket onto the rod. If there is no bolt, check your spare parts container. Without looking at mine, it's probably a 5/16" X 3/4"USS bolt. It may have been loosened for a reason or it could have simply come loose from lack of maintenance.

As the new owner of an old Jeep, you will find a whole lot of great and not so great suggestions here. Do what seems most reasonable to you.

My suggestion is to change all the fluids. That way you have a baseline for future service and you will become more familiar with your Jeep.
By all fluids, I mean:
1)- Motor oil & filter
2)- Transmission & Transfer case
3)- both differentials
4)- Brake and clutch fluids.

Grease the Zerks and check suspension for any worn parts.

New cap, plugs, rotor & wires

After all the above there will still be plenty for you to do to maintain and upgrade your new toy.

Things will be much easier for you if you have access to a Factory Service Manual. If you don't have one ask how to get one.

Welcome to the forum and Good Luck, L.M.

1987 YJ-4.2L-Standard Shift- Re-manufactured Carter Carb-2" body Lift-31X10.5X15 BFG KOs-190K Miles
HEI distributor with computer and all related relays and wiring removed.
No back seat.
12K Badlands winch with dual batteries.
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Old 01-10-2017, 03:28 PM
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Thanks for the advice. I don't have a spare parts bin at home but I am going to try that next time I am at work we have a bit of work shop there.

the jeep is in pretty good shape mechanically it had to under go mandatory safety inspection before I could licences it because I actually live in Ontario Canada it's very extensive for example I had to wait an extra two days for the guy to put in suspension bushing before it would pass.

I am definatley planning on getting a hold of a Service Manual.
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Old 01-12-2017, 11:41 PM   #4
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That lever in near impossible to move by hand. The transfer case lever arm should be straight up for 2WD.

The normal location for that block that slides on the shaft is right in the middle of the adjustment limits. Start with it there. That bolt locks it in position.

'91 YJ Sahara 4.0L/AX-15/NP231, D30/D35 @3.07
'12 KK Cherokee 3.7L/42RLE/MP1522,D30M/8.25@3.73
Emissions testing? YES
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4wheel drive , problems , shift lever , transfercase

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