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Unread 04-28-2005, 08:21 PM   #1
91GTA350
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internal vs external slave cylinder

Ok I have read a million and one posts about swapping a ax-15 in for a puegot, and am ready to start asking questions myself. I hear that I should be looking for a '94 or newer ax-15 out of a wrangler because it is external slave. I assume external slavve just means that the slave cylinder is outside of the bell housing. What is the differnce between internal and external? Why would one be better than the other?

I won't be starting this job for another 4 to 5 weeks, but the earlier I can start getting parts, the better I feel. If I could find almoast all of the parts a week before the job, then life is good.

Thanks to all

Steve

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-89 sahara 258: [U]HAD[/U] a peugot and a d35
5/15/05 - took ownership and started money pit
9/17/05 - found a 3.5' deep water hole
2/18/06 - destroyed spiders in d35
4.2/AX-15/NP-231/SYE/30/8.8/3.55/RE 2.5"/31"
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Unread 04-28-2005, 08:28 PM   #2
saminwy
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mainly ease of changing it i think.
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Unread 04-28-2005, 08:34 PM   #3
jrcaz7
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From what i've heard internal is much more expensive/difficult to replace and external is cheaper/easier to replace
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Unread 04-28-2005, 09:03 PM   #4
91GTA350
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So assume if I find a ax-15 with a working internal slave cylinder, and I will assume it will last for a while. Will that be fine to install that in the jeep?
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-89 sahara 258: [U]HAD[/U] a peugot and a d35
5/15/05 - took ownership and started money pit
9/17/05 - found a 3.5' deep water hole
2/18/06 - destroyed spiders in d35
4.2/AX-15/NP-231/SYE/30/8.8/3.55/RE 2.5"/31"
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Unread 04-28-2005, 11:05 PM   #5
JungleLarry
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The external slave will save you bunches of money if you're slave cylinder ever goes out. I would definitely find a Jeep with one.

The internal slave is just a pain to install and service.
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Unread 04-28-2005, 11:15 PM   #6
91GTA350
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so if 94 was the first year of the external slave, what was the last? I see now the new 05 jeeps have 6 speed tranys. Also can I find a ax-15 off another jeep other than a wrangler?

Thanks for the great info

Steve
__________________
-89 sahara 258: [U]HAD[/U] a peugot and a d35
5/15/05 - took ownership and started money pit
9/17/05 - found a 3.5' deep water hole
2/18/06 - destroyed spiders in d35
4.2/AX-15/NP-231/SYE/30/8.8/3.55/RE 2.5"/31"
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Unread 04-28-2005, 11:36 PM   #7
JungleLarry
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My knowledge of Jeeps starts at 1989 and stops at 1995

All I know about TJs is that they have these pansy things called "coils". WTF?!
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Unread 04-29-2005, 07:52 AM   #8
TellyDSP
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Here's a page I foudn with some info. I believe the AX-15 went out in 02. And from what I've read, you can use 15's from other models.
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Unread 04-29-2005, 08:25 AM   #9
JeepCrz
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The external slave was used on the ax15 from 94 till they changed transmissions. The slave, line, and clutch master cylinder are all one part it can be found seperated at 4wd hardware and some other places.

Things to consider when making the swap.

The push rod length.
The push rod hole that connects to the clutch will need drilled larger if you use the new master cylinder.
The master cylinder bracket will need drilled and ground to fit on the studs and around your bulkhead electrical connecter.
The pilot berring is not the same size.
The transmission is 23 splined output vs 21 like a BA10 so you will have to change the input on your transfercase or pick one up with the AX15.
Keep this in mind as well, the np231 you have on the BA10 may be clocked more one way vs the other so you transfercase hang lower or higher.
Depending on your transmission / transfercase clocking your 4wd shifter may need modified to fit.
Last, your transmission mount will need modified or your skid plate. I cut the orignial ax10 mount and welded/bolted the ba10 to it. It was the only way I could match the holes in the skid plate to the ones in the ax15 since it came out of a mid 90's jeep.
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Unread 04-29-2005, 10:10 PM   #10
dabomb5756
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The only bad thing about an external slave is that the throwout bearing is on a fulcrum with the slave. So, when you push clutch in, the throwout bearing does not hit straight dead on, and keep going straight. Therefore, the throwout bearing needs more attention, which is inside tranny.
But, it is easier to change slave itself.
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Unread 04-29-2005, 10:14 PM   #11
91GTA350
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Please elaborate on a few things here.
Quote:
Originally Posted by JeepCrz
The slave, line, and clutch master cylinder are all one part it can be found seperated at 4wd hardware and some other places.
If I keep the same master cylinder, what to I have to modify to fit the newer external slave or can I just connect the current fliud lines to the new external slave? and is this the right part? I assume I would need a slave from a 94/5 yj.
http://www.4wd.com/shop/productdetai...tsku=52107640S
Quote:
Originally Posted by JeepCrz
Keep this in mind as well, the np231 you have on the BA10 may be clocked more one way vs the other so you transfercase hang lower or higher.
Depending on your transmission / transfercase clocking your 4wd shifter may need modified to fit.
Would this interfear with my plans to put a 1" body lift and a 1.5" susspension lift. I know I might need to add a litle length to the trans or t-case shifter with the body lift. And by modified, do you just mean bent to fit through the hole in the body?

Thanks for all the help. This is a lot of new info for me. Please keep the knowledge coming.

Steve
__________________
-89 sahara 258: [U]HAD[/U] a peugot and a d35
5/15/05 - took ownership and started money pit
9/17/05 - found a 3.5' deep water hole
2/18/06 - destroyed spiders in d35
4.2/AX-15/NP-231/SYE/30/8.8/3.55/RE 2.5"/31"
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