jeep T-18, pops out of 4th gear? alot - Off-Road Forums & Discussion Groups
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post #1 of (permalink) Old 12-07-2000, 08:42 PM Thread Starter
 
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jeep T-18, pops out of 4th gear? alot

a good friend of mine has a jeep t-18 that pops out of 4th gear all time. (well it will stay in for a while, and if you hold the stick it won't come out)
it's been remove and installed many many times,[img]/wwwthreads_images/icons/frown.gif[/img]
we don't know the origin or history (bought used) but he did replace all bearings before he put it in the 1st time.
then we put in new brass rings, springs and clips, no luck
then we put in a new whole synchro assy, no luck
then we change the top shift balls and springs, no luck
then changed the entires top shift of another good t-18, no luck

any help would be appreciated, thanks



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post #2 of (permalink) Old 12-07-2000, 09:13 PM
 
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Re: jeep T-18, pops out of 4th gear? alot

Ive never heard of that?
the one in My FORD truck has real close to 300K miles on it, and it stays in whatever gear under whatever load.

are you sure it isnt hitting the body sheet metal and not fully in gear?



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post #3 of (permalink) Old 12-07-2000, 09:38 PM
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Re: jeep T-18, pops out of 4th gear? alot

My T-150 was doing that in 2nd. The gear and blocking ring were wore. It would just spit it out of gear when you touched the gas. You could downshift fine but when you touched it, pop , out it would go. It's been fine eversince.

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post #4 of (permalink) Old 12-08-2000, 09:33 AM
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Re: jeep T-18, pops out of 4th gear? alot

The problem of popping out of fourth gear can have many sources. Alignment with the engine is often the cause, the input shaft must run true with the crankshaft if it is off center or at an angle the maindrive gear will have an orbital motion that will cause the sliding clutch to walk back off of the drive lugs. A dial indicator affixed to the flywheel should be used to check the bellhousing pilot bore and rear face to see if it runs true. the transmission front bearing retainer should be checked to see if it mates snugly in the bellhousing. If every thing checks good, then the only thing left is wear on the main drive gear and sliding clutch drive lugs, if the sliding clutch is bellmouthed on the flanks of the splined area that engages the blocking ring and main drive gear this will cause it to jump out of gear, (this type of wear is usually caused by poor transmission alignment, that is why i reccomended checking alignment first).

good luck, jjc

post #5 of (permalink) Old 12-08-2000, 11:07 AM
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Re: jeep T-18, pops out of 4th gear? alot

Is it body lifted or anything? Is the shift boot really tight? Do you have a CV joint over the top of the shifter to keep moisture out?---What I mean by these is: Is there anything that could be pushing the shift lever out of gear, like body movement, stress from a taut shift boot or moisture boot, etc.? Might be an easy fix if there is...

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post #6 of (permalink) Old 12-08-2000, 06:13 PM
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Re: jeep T-18, pops out of 4th gear? alot

what jjc said makes sense, mine did the same in 3rd and 4th until one time i got the tranny cross memeber hung up on a mound of dirt. ever since it has been great....i guess the dirt pile help 're-align' everything

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post #7 of (permalink) Old 12-08-2000, 09:15 PM Thread Starter
 
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Re: jeep T-18, pops out of 4th gear? alot

thanks but there is nothing like that in the way,
he's not even running that large rectangular cover, it's just open to the ground (a result of having the tranny in and out so many times)

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post #8 of (permalink) Old 12-08-2000, 09:30 PM Thread Starter
 
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Re: jeep T-18, pops out of 4th gear? alot

thanks for the reply,
we have not really checked out the alignment to the eng/flywheel/bellhousing,
but everything seems good, pilot bushing new, clutch/pressure plate new, resurfaced flywheel, and we put in a different T-18 and transfercase assy. and it works fine. so i guess that means the cluthch/bellhouing stuff is OK..
as far as the main input gear being worn, (it looks OK were the synchro slides over to engage) but we are looking for one. it's a wide ratio Jeep T-18 with the short style input and he is having difficulty finding one. new or used.

but we do think this is the problem......[img]/wwwthreads_images/icons/frown.gif[/img]

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