T-176 pops out of 4 gear - JeepForum.com
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post #1 of 8 Old 04-17-2019, 04:17 PM Thread Starter
UphillBattle
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T-176 pops out of 4 gear

My transmission pops out of 4th when coasting. I have also had issues with not being able to shift into 3rd or 4th without stopping and shifting into reverse (I can shift between 1st and 2nd, just not into 3rd or 4th and the transmission is in neutral, not stuck in a gear when this occurs). Not sure if these are related problems. The transmission pops out every time when coasting in 4th. The second issue has only occurred a few times in cool weather and when accelerating quickly. I had a manual transmission mechanic look over the transmission prior to the rebuild and said all was well. I have been told that when a transmission pops out of gear it is the synchronizer but I would not expect a 4 gear synconizer to go bad. I am thinking it may be a worn synchronizer plate or weak synchronizer spring but thought I would experience the same thing in 3rd gear if this were the case (which it is not).

This 1980 CJ5 was an old plow jeep and I did have to replace the transmission case cover due to it being broken at the fulcrum pin.

Any guidance would appreciated. Sorry for the long winded post.

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post #2 of 8 Old 04-17-2019, 04:22 PM
LumpyGrits
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Cj

First sign of a worn T-176.....
Rebuild time.
LG

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post #3 of 8 Old 04-18-2019, 06:09 AM
John Strenk
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Quote:
Originally Posted by UphillBattle View Post
My transmission pops out of 4th when coasting. I have also had issues with not being able to shift into 3rd or 4th without stopping and shifting into reverse (I can shift between 1st and 2nd, just not into 3rd or 4th and the transmission is in neutral, not stuck in a gear when this occurs). Not sure if these are related problems. The transmission pops out every time when coasting in 4th. The second issue has only occurred a few times in cool weather and when accelerating quickly. I had a manual transmission mechanic look over the transmission prior to the rebuild and said all was well. I have been told that when a transmission pops out of gear it is the synchronizer but I would not expect a 4 gear synconizer to go bad. I am thinking it may be a worn synchronizer plate or weak synchronizer spring but thought I would experience the same thing in 3rd gear if this were the case (which it is not).

This 1980 CJ5 was an old plow jeep and I did have to replace the transmission case cover due to it being broken at the fulcrum pin.

Any guidance would appreciated. Sorry for the long winded post.
How long ago did he rebuild it?

Do you have to stop the jeep to shift from 3 to 4 or just stop moving the lever and let it sit in neutral for a few seconds between 3 and 4 ?

It almost sounds as if the 3-4 fork that slips around the synchronizer ring is in the wrong location. This might throw off how the interlocks works and may not let the ring sit fully in 4th gear.

It would be interesting to see how the gates line up in each gear. Or putting it into 4th, remove the shift lever and see if you can push the gate further. forward.

Of course a worn out input bearing will allow too much slop that might force the ring out also.

Also make sure two of the cover bolts have the long shoulder that aligns the cover properly are installed. If he used the same bolts in all the positions you could not be sure the top is in the correct location. This could prevent you from fully engaging 4th .
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post #4 of 8 Old 04-18-2019, 09:37 AM
jeepdaddy2000
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Popping out of 4th is usually a sign of the syncro ring not engaging completely or excessive movement in the output shaft.


Worn/loose shift fork (driving around with your hand hanging on the shifter)

Bad output bearing (vertical/lateral movement in the mainshaft)

Loose bull gear (some models)
Excessive clearance between the gear and the mainshaft (rare)



The second problem almost sounds like a interlock pill issue. or the rails not being properly aligned. I would be curious to see if the rail gates were parallel when this happens.

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post #5 of 8 Old 04-20-2019, 05:41 PM
Marshall78
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Jeepdaddy is correct. Popping out of gear when not under power is a sure sigh of a worn synchro ring. Rebuild time.
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post #6 of 8 Old 04-20-2019, 07:15 PM
LumpyGrits
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Cj

The brass synco ring does not hold the tranny in gear.
LG

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post #7 of 8 Old 04-21-2019, 02:50 AM
80cj
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Quote:
Originally Posted by LumpyGrits View Post
The brass synco ring does not hold the tranny in gear.
LG
They probably meant synchro sleeve. But I agree with you that it's probably rebuild time. Worn bearings allow the mainshaft to move back and forth causing synchros to slip out of gear.
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post #8 of 8 Old 04-21-2019, 09:13 AM
jeepdaddy2000
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Quote:
Originally Posted by LumpyGrits View Post
The brass synco ring does not hold the tranny in gear.
LG


Quote:
Originally Posted by 80cj View Post
They probably meant synchro sleeve.

Your correct. I mislabeled my part.

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