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Unread 01-23-2006, 02:17 PM   #1
CRAZYJ1988
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Join Date: Dec 2005
Location: houston
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transmission

when downshifting from 3rd to 2nd it wont go into second gear
just seems to grind and make weird noises

but when shifting from 1st to 2nd it goes in perfectly fine

what could be causing this

its a 1990 4.2 i believe its a ax 15 tranny

anything helps

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Unread 01-23-2006, 02:23 PM   #2
Fenix85182
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How many miles do you have on it? Could be the synchromesh on second gear. Second and fourth are the first to go on the AX15.

They swapped tranmissions half way through the 1989 production year, so you definitely have the AX15 if it's still the stock transmission.
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Unread 01-23-2006, 02:35 PM   #3
naviathan
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My 92 does that. Doesn't grind when down shifting, but won't go into gear until I get below a certain speed. Doesn't like to go into first until I'm at a complete stop and when it's cold it grinds in 2nd.
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Unread 01-23-2006, 02:37 PM   #4
dos0711
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Quote:
Originally Posted by naviathan
My 92 does that. Doesn't grind when down shifting, but won't go into gear until I get below a certain speed. Doesn't like to go into first until I'm at a complete stop and when it's cold it grinds in 2nd.
Same here.
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Unread 01-23-2006, 02:52 PM   #5
CRAZYJ1988
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it might be cause its cold because it just got "cold" in houston you know like mid 40's 50's

so im just going to check the fluid and change it and wait it out

thanks guys
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1990 YJ
3.5 inch superlift
1/2 inch HD shakles
3 inch BL =/
35X12.50 BFG Mud Terrains
4.2 L
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Unread 01-23-2006, 04:51 PM   #6
CRAZYJ1988
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so the bolt stripped on the transmission to put fluid in it

any ideas on how to fix it
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1990 YJ
3.5 inch superlift
1/2 inch HD shakles
3 inch BL =/
35X12.50 BFG Mud Terrains
4.2 L
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Unread 01-24-2006, 07:49 AM   #7
paintguy
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vice-grip the stripped bolt and then get a new one.
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Unread 01-24-2006, 08:18 AM   #8
ohhpe
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mine does the same thing.. ax-15
i just match the rpms when shifting into second.... example... driving in 3rd, slowing down take out of 3rd gear, let clutch back out, rev pedal to about 2200 rpms or wherever yours works best, then push in clutch and should slip right into 2nd with ease while your still at the rpms....

i havent tried switching the tranny fluid yet, let me know if it helps!
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Unread 01-24-2006, 08:49 AM   #9
MCJeeper
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I have the exact same probalblem when shifiting into 2nd then have to be basicaly be stoped to go into 1st. I have had this problem ever since i bought the jeep a little more than a year ago. let us know if changing the fluid helps.
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Unread 01-24-2006, 09:00 AM   #10
naviathan
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I just put fresh 80-90 in mine and it's still the same. The fluid that came out was milky like it got water in it somehow, but aside from 1st, when it's cold and downshifting everything else works great.

(I know, that's like saying virgins are great in bed except they don't know anything and bleed all over the place...)
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Unread 01-24-2006, 11:08 AM   #11
flagstaffjeeper
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yeah, like ohhpe said, try to double de-clutch when you are downshifting from 3rd to second. although you are supposed to have a syncromesh tranny, the 2-3 syncro could be going out. double de-clutching will help to match the revs and should make the shift smoother. shifting like this is kind of weird at first, but it quickly can become second nature, and it sounds cool, too.
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Unread 01-31-2006, 11:15 AM   #12
CRAZYJ1988
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changing the fluid did help alot it goes right into 2nd now

mine has to be pretty much stopped to go into first too


but 4th gear is acting up bad it scratches horribly when i shift into 4th always does it now


maybe the synchros are going out on 4th or what ??

thanks for the help guys
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1990 YJ
3.5 inch superlift
1/2 inch HD shakles
3 inch BL =/
35X12.50 BFG Mud Terrains
4.2 L
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Unread 01-31-2006, 01:36 PM   #13
psycho_emt_yj
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very good possibility it is the synchros. oes it always grind in 4th? Mine went out in 2nd and 4th and i just drove it. Until it finally got stuck in first.
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