Author Topic: Rebuilding ax15 advice  (Read 361 times)

Offline joefech

  • Newbie
  • Posts: 20
Rebuilding ax15 advice
« on: December 12, 2017, 02:23:45 AM »
I’ve tried replacing the clutch hydraulics and clutch.  Red line gl4 fluid and even tried 10w-30.

 Still still can’t get it to shift properly. 240k miles on it so I guess I’ll rebuild it  :mrgreen:

Any suggestions for installing the rebuild kit?  There are plenty of YouTube videos but they don’t cover any shimming or clearances

Offline YJScrounge

  • Board of Directors
  • Rock Crawler
  • *********
  • Posts: 4278
Re: Rebuilding ax15 advice
« Reply #1 on: December 12, 2017, 06:47:28 AM »
sure you got all the air out of the clutch system? It's not always that easy...
"This situation requires an immature act be carried out on someone's behalf - We're just the guys to do it!" - Animal House

93YJ: Waggy 44 HD's F&R, Rear Detroit Locker, Front Eaton Elec Selectable, 5:13 Motive, Anti-Wrap Bar, WARN Hubs, 6" Lift on 35" Mud Terrains, 4.0 HO w/K&N Air Tube, Live Wire Ignition, WARN 8,000 lb Winch, AtoZ Cage and Sliders, FX Tuner Seats w/Harnesses, OBA, SOA

01 RAM Cummins Tow Rig

01 WJ: Son's DD/Mall Crawler, 2" Budget Boost, Skyjacker Shocks, JK 17" Wheels back-up Tow Rig

Offline Greenhorn

  • NEJEEP Member
  • Rock Crawler
  • *****
  • Posts: 2489
Re: Rebuilding ax15 advice
« Reply #2 on: December 12, 2017, 07:27:05 AM »
  Use the "sealed unit" master, slave and line assembly. It eliminates bleeding.
Other than that, it sounds like it spent too much of it's life with gear oil in it.

  You would have to go way back to GL3 before you had a non destructive lube in there.
If your transmission was made before the mid 90's, its normal for them to shift lousy, especially in the cold.
That condition is what prompted the syncro ring material revision. They switched to a bronze material fixing the shifting problem, but since that transmission was on its way out and the NP was coming up, they never revised the documentation.
So everyone kept dumping in gear oil like the manual says.   The problem lies in the OIL also being revised. It contained detergents that dissolve the bronze material syncro rings.   

Dope isn't it?     LOL
  My reading of history convinces me that most bad government results from too much government.
  To compel a man to subsidize with his taxes the propagation of ideas which he disbelieves and abhors is sinful and tyrannical.
 -Thomas Jefferson

Offline RedJeepster1

  • NEJEEP Member
  • Rock Crawler
  • *****
  • Posts: 1176
Re: Rebuilding ax15 advice
« Reply #3 on: December 12, 2017, 10:07:14 AM »
I've rebuilt 2 Ax-15's. I was able to find the clearances on youtube in one of the videos I used for reference. If you can't find the info I can try to dig it up, it's been a while though.
88 YJ, D30, D35, 4.10's, 4.6L Stroker, MPFI, Skyjacker 2.5" Lift, 33's
00 XJ, HP30, Front Truss, WJ Knuckles, High Steer, 3 link, Locked C8.25 w/ Chromo's, IRO Leafs, 4.56's, Rebuilt 4.0, JK Rubi Wheels, 35's

Offline joefech

  • Newbie
  • Posts: 20
Re: Rebuilding ax15 advice
« Reply #4 on: December 12, 2017, 11:42:07 AM »
Thanks everyone—I’ll check YouTube some
More and maybe even read some actual manuals/instructions

I thought gl5 was the synchro killer

Offline MattG

  • NEJEEP Member
  • Rock Crawler
  • *****
  • Posts: 2899
  • Probie of the year!
Re: Rebuilding ax15 advice
« Reply #5 on: December 12, 2017, 11:43:52 AM »
Those syncs are shot, I rebuilt an ax5 and it wasn’t that hard.
***** TOM FOR PREZ 2017 ******
MAKE NORTHEAST JEEP GREAT AGAIN!

Offline joefech

  • Newbie
  • Posts: 20
Re: Rebuilding ax15 advice
« Reply #6 on: December 12, 2017, 11:47:26 AM »
I know there are a billion threads about what fluid to run and everybody has their own opinion

What have you had success with?  10w30 sounded raunchy I’d like to run thicker

Offline JBert

  • NEJEEP Member
  • Web Wheeler
  • *****
  • Posts: 514
Re: Rebuilding ax15 advice
« Reply #7 on: December 12, 2017, 12:24:19 PM »
I know there are a billion threads about what fluid to run and everybody has their own opinion

What have you had success with?  10w30 sounded raunchy I’d like to run thicker

I'm running Penzoil Synchromesh and it seems to help with some roughness in the trans.
-Justin-
88 YJ - 05 WK

Offline RedJeepster1

  • NEJEEP Member
  • Rock Crawler
  • *****
  • Posts: 1176
Re: Rebuilding ax15 advice
« Reply #8 on: December 12, 2017, 12:49:53 PM »
I've always run 10w30 in mine.
88 YJ, D30, D35, 4.10's, 4.6L Stroker, MPFI, Skyjacker 2.5" Lift, 33's
00 XJ, HP30, Front Truss, WJ Knuckles, High Steer, 3 link, Locked C8.25 w/ Chromo's, IRO Leafs, 4.56's, Rebuilt 4.0, JK Rubi Wheels, 35's

Offline MattG

  • NEJEEP Member
  • Rock Crawler
  • *****
  • Posts: 2899
  • Probie of the year!
Re: Rebuilding ax15 advice
« Reply #9 on: December 12, 2017, 12:50:14 PM »
Ive run it all

Syncmech, MT90, Royal P etc etc all felt the same

nothing will stop the brass syncs from grinding down, the problem lies in the shit design of using such a soft metal.

After I rebuilt my ax5, and seeing what caused the shifting failure, I knew for a fact no oil caused the damage that I saw. It was repeated use of engage/disengage.

So bottom line is run what you want. For what its worth, I filled my trans back up with Pennz syncmesh, mainly because im a Pennzoil man. Thats the oil I run in all my motors, just like I always run NGK plugs

Here is my thread on the AX5 rebuild
http://forum.northeastjeep.org/index.php?topic=36397.0

If you look at this picture, you can see the failure point of the sync. That sloped shaving was not caused by the wrong oil, Thats caused by hard metal hitting soft metal, repeatedly over time. Metallurgy 101




***** TOM FOR PREZ 2017 ******
MAKE NORTHEAST JEEP GREAT AGAIN!

Offline MassJK

  • Global Moderator
  • Rock Crawler
  • *******
  • Posts: 17882
Re: Rebuilding ax15 advice
« Reply #10 on: December 12, 2017, 01:43:00 PM »
Ham fisted shifting
Quote from: Mrs. Whoopie Pies
Then we have those guys that feel like constant cornmeal in ones pants . Alan for example.

Offline joefech

  • Newbie
  • Posts: 20
Re: Rebuilding ax15 advice
« Reply #11 on: December 12, 2017, 02:10:36 PM »
More great info thanks!

Offline joefech

  • Newbie
  • Posts: 20
Re: Rebuilding ax15 advice
« Reply #12 on: December 14, 2017, 08:44:41 PM »

3 of the synchros looked at least as bad as the pictures you posted in your rebuild thread. I’m going to make sure to be gentle shifting.

Ive run it all

Syncmech, MT90, Royal P etc etc all felt the same

nothing will stop the brass syncs from grinding down, the problem lies in the shit design of using such a soft metal.

After I rebuilt my ax5, and seeing what caused the shifting failure, I knew for a fact no oil caused the damage that I saw. It was repeated use of engage/disengage.

So bottom line is run what you want. For what its worth, I filled my trans back up with Pennz syncmesh, mainly because im a Pennzoil man. Thats the oil I run in all my motors, just like I always run NGK plugs

Here is my thread on the AX5 rebuild
http://forum.northeastjeep.org/index.php?topic=36397.0

If you look at this picture, you can see the failure point of the sync. That sloped shaving was not caused by the wrong oil, Thats caused by hard metal hitting soft metal, repeatedly over time. Metallurgy 101



Offline bigdaddymack51

  • Rock Crawler
  • ****
  • Posts: 1511
Re: Rebuilding ax15 advice
« Reply #13 on: December 15, 2017, 06:51:41 AM »
Everything Ive read is what has been said. You need to use an oil thats yellow metal friendly. A lot of people swear by Pennzoil 10-30 motor oil. If your still craving heavier oil , go with a straight 30w oil. Im a "Pennzoil" guy also. Everything I own uses it. Except the I-6 I built in the Jeep. It gets nothing but VR-1 by Valvoline , because of the zinc content .  Its just reference to which oil , common sense tells you hard metal Vs. soft metal   you know who wins.  I only have a T-176 with 85/140 sludge in it and its happy.  FjR68

Offline Broken99TJ

  • NEJEEP Member
  • Rock Crawler
  • *****
  • Posts: 1206
    • http://www.objectriver.net
Re: Rebuilding ax15 advice
« Reply #14 on: December 15, 2017, 11:30:53 AM »
Quote
I'm running Penzoil Synchromesh and it seems to help with some roughness in the trans.
What he said.

Offline joefech

  • Newbie
  • Posts: 20
Re: Rebuilding ax15 advice
« Reply #15 on: December 20, 2017, 02:00:21 PM »
In bought this kit

 https://rover.ebay.com/rover/0/0/0?mpre=https%3A%2F%2Fwww.ebay.com%2Fulk%2Fitm%2F191659427330

And it was good quality and everything went together well except for the 5th gear synchro

I had to grind off the outer diameter next to the engagement teeth to get it to fit properly

Shifts great now  :cool:

Offline RedJeepster1

  • NEJEEP Member
  • Rock Crawler
  • *****
  • Posts: 1176
Re: Rebuilding ax15 advice
« Reply #16 on: December 20, 2017, 02:31:43 PM »
Looks like you work quick!
88 YJ, D30, D35, 4.10's, 4.6L Stroker, MPFI, Skyjacker 2.5" Lift, 33's
00 XJ, HP30, Front Truss, WJ Knuckles, High Steer, 3 link, Locked C8.25 w/ Chromo's, IRO Leafs, 4.56's, Rebuilt 4.0, JK Rubi Wheels, 35's

Offline joefech

  • Newbie
  • Posts: 20
Re: Rebuilding ax15 advice
« Reply #17 on: December 20, 2017, 08:50:53 PM »
Looks like you work quick!

YouTube videos by Robinsonsauto were very helpful