Hard to shift from 4 low to 4 high - JeepForum.com
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post #1 of 16 Old 09-06-2019, 11:13 PM Thread Starter
AKMTNMAN
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Hard to shift from 4 low to 4 high

I am new to Jeep Forum and somewhat new to Jeeps in general. I just bought a 1984 jeep CJ8 Alaska Postal. It has a few issues and I have a handle on most of them. But I am having trouble when shifting out of 4 low to 4 high and back. I have to force it HARD. Some times I can take it out of park to reverse and back to park and it will then shift from 4 low to 4 high, but I still have to put a little force behind it. Then it is just as hard to get back to 4 low. Can anyone out there give a starting point or two. It has a strait 6 and three speed auto Trans and dana 300 transfer case, it will run thru the gears from park thru R,N, D1, D2, D3 and back like butter. but shifting anywhere between 4 low and high is a chore. PLEASE HELP.

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post #2 of 16 Old 09-07-2019, 12:33 AM
Pathfinder33
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My Dana 300 was hard to shift when I first picked it up from the PO. I found that I had a leak on the output shaft, and that a bunch of fluid had drained out. Once it was topped off with fluid it shifts like a dream. I would check with the fluid level first. This case is a gear on gear case, and if there is no lube, and the gears get hot, they can be a chore to shift from one to the other.
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post #3 of 16 Old 09-07-2019, 01:43 AM
80cj
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Quote:
Originally Posted by AKMTNMAN View Post
I am new to Jeep Forum and somewhat new to Jeeps in general. I just bought a 1984 jeep CJ8 Alaska Postal. It has a few issues and I have a handle on most of them. But I am having trouble when shifting out of 4 low to 4 high and back. I have to force it HARD. Some times I can take it out of park to reverse and back to park and it will then shift from 4 low to 4 high, but I still have to put a little force behind it. Then it is just as hard to get back to 4 low. Can anyone out there give a starting point or two. It has a strait 6 and three speed auto Trans and dana 300 transfer case, it will run thru the gears from park thru R,N, D1, D2, D3 and back like butter. but shifting anywhere between 4 low and high is a chore. PLEASE HELP.
Does the tranfer case grind when you have difficulty? What happens if you put the trans in neutral?
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post #4 of 16 Old 09-07-2019, 06:29 AM
jay-h
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It's sometimes a bit tricky with the automatic. To go into 4 low, I need to roll about 5mph, drop to neutral, then pull it in.

To come out I have to full stop, put it in park, and shift. The reason is, I believe, that even in neutral there is a little tendency for the tailshaft to still be turning, moving to park prevents that.


But I still prefer that over the newer electric controlled shifting. All kinds of problems with those

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post #5 of 16 Old 09-07-2019, 09:13 PM Thread Starter
AKMTNMAN
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The fluid level does not seem to be the problem. Thank you for response that makes one thing I can eliminate.
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post #6 of 16 Old 09-07-2019, 09:15 PM Thread Starter
AKMTNMAN
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There is no grinding and it does not matter if it is in park or neutral. If I put it in gear for a second, and then back to neutral it will then shift into 4 low or out of 4 low.
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post #7 of 16 Old 09-07-2019, 09:18 PM Thread Starter
AKMTNMAN
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Originally Posted by jay-h View Post
It's sometimes a bit tricky with the automatic. To go into 4 low, I need to roll about 5mph, drop to neutral, then pull it in.

To come out I have to full stop, put it in park, and shift. The reason is, I believe, that even in neutral there is a little tendency for the tailshaft to still be turning, moving to park prevents that.


But I still prefer that over the newer electric controlled shifting. All kinds of problems with those
Thanks for the info I will try your slow roll trick and see if it works. I am at work for the next few days then go strait into a three week moose hunting trip, I will try it as soon as I get back from the hunt and I will let you know if it works. Thanks again.
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post #8 of 16 Old 09-08-2019, 04:55 AM
skizriz
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Quote:
Originally Posted by jay-h View Post
It's sometimes a bit tricky with the automatic. To go into 4 low, I need to roll about 5mph, drop to neutral, then pull it in.

To come out I have to full stop, put it in park, and shift. The reason is, I believe, that even in neutral there is a little tendency for the tailshaft to still be turning, moving to park prevents that.


But I still prefer that over the newer electric controlled shifting. All kinds of problems with those
Same way i do it with my Dana18. Never any problems going back to high again. I just do it at a little higher speed.
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post #9 of 16 Old 09-08-2019, 02:46 PM
LumpyGrits
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Cj

Stop-And back up 10-15 feet to release the torque bind on the driveline.
Do this in a straight line-no turn'n etc.
LG

Have'n you along, is like loose'n 2 good men
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post #10 of 16 Old 09-09-2019, 07:51 AM
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They are like that.

There is no synchro and you do not pass through neutral, so you are fighting all the forces in the driveline. As Lg says, back u a bit and work it, eventually it will slot in. The very lest you should do is go to neutral on the transmission whilst you are shifting the transfer box.

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post #11 of 16 Old 09-09-2019, 08:26 AM
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twin sticks.. shifts like butter... easy to install and totally worth it


1980 CJ-7 Alpaca Brown 4.2L, SR4
2.5" lift, Method Con6's, Weber 38, DUI HEI, Painless Harness
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post #12 of 16 Old 09-09-2019, 05:15 PM
ddawg16
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Under what conditions are you going into 4Lo or 4Hi? It should only be on dirt or gravel. It's not intended for hard surface roads.

The ratio from front to back is the same...but not the same. Because of minor differences in tire diameter, one axle may turn more or less than the other. After a few hundred feet, there could be enough difference to case the front and rear axles to be under tension....which would explain one reason for the hard shifting.

One way to confirm this is the issue....open up your front hubs. If it's easy after that, then you know what the problem is.
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post #13 of 16 Old 09-09-2019, 08:18 PM
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Unlock hubs, move it a couple feet, and try it. That should do the same as the reversing. I usually just put light pressure on the shifter in the direction I want it to go, and since I am on soft ground, pop the clutch real quick to get tire spin, that unbinds it and the lever moves.

Rick

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post #14 of 16 Old 09-10-2019, 05:23 PM
gmellison
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Our Dana 300s don’t shift well under any load. Without synchromesh you have to help them mesh. Do this by providing a little movement to all three shafts. Coasting a bit rolling all four and sometimes adding a little input from the transmission, I let out the clutch just a bit to help but in auto you shouldn’t have an issue in neutral. Don’t try to shift on a hill or with a load bound up on the drivetrain. I hope this helps and good job snagging a poastal!
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post #15 of 16 Old 09-12-2019, 04:08 AM
jay-h
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Kind of keep in mind that the process is somewhat different between manual and automatic. There is advice above for both, follow the examples depending on which you have.

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