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J10 won't go into gear with the engine running.

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    Posted: Mar/21/2020 at 1:26am
1983 J10 - 258 w/ manual transmission (T176 I think)- MANUAL linkage, not hydraulic.

Truck was running fine until I tried to shift into reverse today.  Now the truck grinds the gears when trying to shift into reverse and WILL NOT shift into any forward gear when the engine is running.

Turn off the engine and it shifts fine.

Push the clutch in and the truck rolls fine.

Any ideas?
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Trader Quote  Post ReplyReply Direct Link To This Post Posted: Mar/21/2020 at 8:13am
If it shifts fine engine off then likely the shift linkage is likely fine. 
More then likely your clutch is not disengaging. Engine on, the gears are spinning and the only way to get it into fear would be to ram it in - not recommended!
Disconnect the battery, put in 1st gear, have someone push the clutch in, see if the engine turns when trying to push the vehicle.
If the engine turns - look at the clutch linkage and possibly the clutch.
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Post Options Post Options   Thanks (0) Thanks(0)   Quote tufcj Quote  Post ReplyReply Direct Link To This Post Posted: Mar/21/2020 at 9:54am
I've seen one finger on a 3 finger pressure plate or the throwout bearing fail and cause the symptoms you describe.  The clutch is disengaging, but not completely, so it drags and causes the gears in the trans to spin.  It's disengaging enough that you can push it. 

Probably time to pull the trans and check the clutch, pressure plate, throwout bearing, and throwout arm (wear on the movement surfaces of the arm).

Bob
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Post Options Post Options   Thanks (0) Thanks(0)   Quote tyrodtom Quote  Post ReplyReply Direct Link To This Post Posted: Mar/21/2020 at 10:06am
Either the bushings in the clutch linkage are worn or fell out, or the fingers at the throw-out bearing are worn.
Anyway something in the clutch linkage isn't fully disengaging the clutch from the flywheel.

You might be able to adjust it out at the adjusting rod,  but you've got to be careful with that,  it's easy to overadjust and not get full clutch engagement .

You need to get under the truck and look close at your clutch linkage.

If you can't see anything wrong visually with the linkage,  then that leaves inside the bellhousing  likely where the problem is..



Edited by tyrodtom - Mar/21/2020 at 10:10am
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Well, the linkage was fine.  Gonna slide t transmission back tomorrow and take a look in the bell housing.

I got the drive shafts loose today and then it got really cold.
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Post Options Post Options   Thanks (0) Thanks(0)   Quote AMCer Quote  Post ReplyReply Direct Link To This Post Posted: Mar/21/2020 at 11:17pm
Does anyone have any tricks to get the transmission shaft to go through the throw-out bearing without knocking it off the fork when re-installing the transmission?
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Post Options Post Options   Thanks (1) Thanks(1)   Quote BrotherBamc Quote  Post ReplyReply Direct Link To This Post Posted: Mar/22/2020 at 12:08am
Do you have the little spring attached to the throw out fork.??
Is the pivot ball in the pivot stand..??
Those 2 items help keep things aligned well enough to get the input shaft through the throw out bearing.
Small piece of masking tape helps hold the spring to the throw out fork so you can grab it and pull it back to where it hooks on to. Don't let it get away from you. You might loose it in the bell housing and the only way to get it out is to remove the bell. Not unless you get lucky with a magnet.
I also use a pair of old bolts and cut the heads of and use them for guide dowels to help align the transmission on to the bell.
Transmission jack is also a big help.

Edited by BrotherBamc - Mar/22/2020 at 12:10am
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Post Options Post Options   Thanks (0) Thanks(0)   Quote 72gremx401 Quote  Post ReplyReply Direct Link To This Post Posted: Mar/23/2020 at 7:54pm
check pilot bushing in crank
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Trader Quote  Post ReplyReply Direct Link To This Post Posted: Mar/23/2020 at 9:11pm
The ball will be held in with a dab of grease. 
The clutch is installed on the flywheel with an alignment tool:
On a Jeep or AMC, the fork, spring and throw out arm, boot, are held in place in the bell housing with the transmission attached to the bell housing.
You install the bell to the transmission with the internal clutch components and then attach the bell to the engine. Aligning usually means rotating the transmission shaft to get it to align with the clutch on the flywheel. This can be done by rotation of the transmission or rotating the transmission shaft from the rear with the transmission in 1st or reverse (my preference).
3 things are aligning here - transmission shaft to the pilot bearing in the crankshaft, transmission spline to the clutch spline, transmission shaft angle with the crankshaft.
If you don't have the weight of the transmission taken up with a transmission jack or cart, this is very exhausting/frustrating to hold the weight and align.


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