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Unread 08-23-2012, 11:42 AM   #1
riverhippy
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what trans can i install

welp....the trans finally went....hopefully this is the final repair frontier for this pig....cuz im ready to send it to the glue factory.


its a 91 yj with the blazing 2.5 and 5 speed manual and 5th gear syncros are shot. it will go into fifth but i can hear it grinding all the way down the road.
if i decide to keep it (which aint lookin so good rite now) i want to put in a heavier duty trans than what it came with, so.....

which transmissions can i put in with out too many modifications?

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Unread 08-23-2012, 11:59 AM   #2
CJ51973
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AX15 (4.0L) is common. Do some searching here. Don't sell your Jeep (did it once, still miss the old CJ), look at it as improving.
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Unread 08-23-2012, 12:06 PM   #3
seraph_rapture
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The AX15 will take some modification to work, but is a stout trans. Of course I'd swap the 4.0 in at the same time, but that's me.
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Unread 08-23-2012, 12:22 PM   #4
riverhippy
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Quote:
Originally Posted by CJ51973 View Post
AX15 (4.0L) is common. Do some searching here. Don't sell your Jeep (did it once, still miss the old CJ), look at it as improving.
thanks...other than the ax's nv3550 or nv3500? if i sell it id get a newer one...cant be with out a jeep bro
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Unread 08-23-2012, 12:36 PM   #5
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Quote:
Originally Posted by riverhippy

thanks...other than the ax's nv3550 or nv3500? if i sell it id get a newer one...cant be with out a jeep bro
to much crome, to much plastic, to much electronic issues.
crome won't get u home bro.

u hear about the guy with arctic addition that the door caught on fire for no apparent reason?

keep the yj.
the less electronics the better IMO
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Unread 08-23-2012, 05:48 PM   #6
Opihi59
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Looking at writeups in the FAQ is helpful, there is a ton of info on here and it will help you decide. You could also choose to rebuild your AX5, or replace it with a reman unit.

AX 15: http://www.jeepforum.com/forum/f12/2...mplete-659386/

NV3550: http://www.jeepforum.com/forum/f12/n...irrels-752742/

If you're hearing grinding in 5th gear while it's engaged and being driven, it is unlikely that your issue is as simple as a 5th gear synchro. You've likely munched up gears, like driven 5th and countershaft 5th, and it isn't as simple as the broken snap ring issue either since you've still got power going to the wheels.
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Quote:
Originally Posted by Brian4.2 View Post
We will be going Metric every inch of the way.
Quote:
Originally Posted by 40dog View Post
yes I'm a some guy and have always put gasket sealer on my surfaces before mating
Quote:
Originally Posted by Virjeep View Post
You should go to Pirate. I hear they are real smart over there. You'd fit right in.
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Unread 09-02-2012, 01:33 PM   #7
riverhippy
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thanks Opi. im a slow learner, what does this mean? "If you're hearing grinding in 5th gear while it's engaged and being driven, it is unlikely that your issue is as simple as a 5th gear synchro. You've likely munched up gears, like driven 5th and countershaft 5th, and it isn't as simple as the broken snap ring issue either since you've still got power going to the wheels." Am i gonna need to do more than replace the trans?
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Unread 09-02-2012, 01:46 PM   #8
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Well, what happens with the snap ring is that the 5th gear slides back on the shaft and no longer meshes with its partner. You go to 5th, and it acts as if it is in neutral. If you are shifting into 5th okay without it grinding in the shift, it is not at all likely that your synchro is the problem at all. Since you get into 5th but then it grinds and that is the only time it grinds, then there is something bad in the meshing of the gears and likely there is a certain amount of gear carnage involved there. Of course with me not being there to hear it myself, there is a lot of conjecture loosed on my part, but that's how I diagnose it based on what I hear from you.
Pull off your T case, pull the rear case of your transmission, and have a look at 5th gear(s) and see what it looks like. If you drain your trans and do not get much in the way of metal chunks, don't be too surprised, it could still be there and just fell in the bottom of the rear case and didn't make it into the front case half where the drain is.
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Quote:
Originally Posted by Brian4.2 View Post
We will be going Metric every inch of the way.
Quote:
Originally Posted by 40dog View Post
yes I'm a some guy and have always put gasket sealer on my surfaces before mating
Quote:
Originally Posted by Virjeep View Post
You should go to Pirate. I hear they are real smart over there. You'd fit right in.
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Unread 09-02-2012, 03:49 PM   #9
riverhippy
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Quote:
Originally Posted by Opihi59 View Post
Well, what happens with the snap ring is that the 5th gear slides back on the shaft and no longer meshes with its partner. You go to 5th, and it acts as if it is in neutral. If you are shifting into 5th okay without it grinding in the shift, it is not at all likely that your synchro is the problem at all. Since you get into 5th but then it grinds and that is the only time it grinds, then there is something bad in the meshing of the gears and likely there is a certain amount of gear carnage involved there. Of course with me not being there to hear it myself, there is a lot of conjecture loosed on my part, but that's how I diagnose it based on what I hear from you.
Pull off your T case, pull the rear case of your transmission, and have a look at 5th gear(s) and see what it looks like. If you drain your trans and do not get much in the way of metal chunks, don't be too surprised, it could still be there and just fell in the bottom of the rear case and didn't make it into the front case half where the drain is.
im looking for a trans now, should i be looking for a transfer case as well?
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Unread 09-02-2012, 06:09 PM   #10
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Not unless your T case is broken as well. If there is no indication that you have any issues with your T case, swapping in a replacement AX5 should be all you need to do. Of course since you're going to have the tranny etc off, it's a good time to consider doing the clutch, etc while you have it off, and of course whatever else you can think of.
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Quote:
Originally Posted by Brian4.2 View Post
We will be going Metric every inch of the way.
Quote:
Originally Posted by 40dog View Post
yes I'm a some guy and have always put gasket sealer on my surfaces before mating
Quote:
Originally Posted by Virjeep View Post
You should go to Pirate. I hear they are real smart over there. You'd fit right in.
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Unread 09-02-2012, 06:41 PM   #11
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Quote:
Originally Posted by seraph_rapture View Post
The AX15 will take some modification to work, but is a stout trans. Of course I'd swap the 4.0 in at the same time, but that's me.
AX-15 takes very little "modification" to swap in, and any modification required is bolt-in.
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Unread 09-04-2012, 07:51 AM   #12
seraph_rapture
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Quote:
Originally Posted by UltimatE View Post
AX-15 takes very little "modification" to swap in, and any modification required is bolt-in.
Swapping input shafts counts as modification in my book. Certainly drilling the TC to clock it if he replaces it with one from a Cherokee.
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