Manche Man Posted July 11 Share Posted July 11 Hey all, with my AX-15 Swap, I'm happy to be driving the jeep again, but I'm finding more and more gremlins rearing their heads. First off, the AX15 shudders a decent amount while either in neutral or in drive (I have the floor and everything taken out so I can see the tranny itself shake) The harder I drop the clutch in neutral, the more it shakes. The harder and more suddenly I hit the gas while driving, the more it shakes. If I gently let the clutch out or press the gas, it doesn't shake near as much. What's my issue? Never resurfaced the flywheel during the swap, probably missed a few other details as it was my first time. Second up! When taking off, no matter how lightly I let off the clutch, the jeeps rear end seems to shudder. Not so when shifting while on the move, only when taking off. Almost seems like a tire is spinning out... one guy told me that's just an aggressive clutch, but that shouldn't make the rear end shudder EVERY TIME, right? (Also have clicking and clunking in the front end while turning and hiting bumps) Appreciate the help, sorry for the long, two/three-pronged post. 1988 jeep comanche base; BA/10- AX15 internal slave Swap, NP231 21-23 spline input gear swap, 4x4, 235/75/15 tires. Stock height. Link to comment Share on other sites More sharing options...
eaglescout526 Posted July 11 Share Posted July 11 How are all your mounts? Motor and trans? Link to comment Share on other sites More sharing options...
pizzaman09 Posted July 11 Share Posted July 11 9 hours ago, eaglescout526 said: How are all your mounts? Motor and trans? I was the same. This is the same symptom that I had when my trans mount was bad in my 88 Comanche with a BA10/5. Link to comment Share on other sites More sharing options...
eaglescout526 Posted July 11 Share Posted July 11 Right. But are any of them new? Sounds like the trans mount is new. Link to comment Share on other sites More sharing options...
Manche Man Posted August 25 Author Share Posted August 25 On 7/11/2024 at 9:44 AM, eaglescout526 said: Right. But are any of them new? Sounds like the trans mount is new. The trans mount was a parts one from a Cherokee. Blue I think of it, it might not have all the bolts in, securing it to the body (looks and feels real tight in there tho). I'll check the engine and tranny mounts tomorrow. Bad u join in the front probably was making the clanking noise, hopefully just have to deal with the drive line now. Link to comment Share on other sites More sharing options...
Manche Man Posted August 25 Author Share Posted August 25 Ok, went with a friend.. as they slowly took off on a paved road, I watched the rear axle shake violently back and forth causing the violent shuddering. Axle hop? Only happens when going from a full stop to barely moving. Gets worse as rpms increase but goes away at around 2/3mph... I never shortened the driveshaft after swapping in the AX15.. is that maybe an issue? Lost here lol. Thanks all! Link to comment Share on other sites More sharing options...
eaglescout526 Posted August 26 Share Posted August 26 How’s all the bushings back there for the leaf springs? Shackle bushings? How about the U-bolts? Sounds like to me the rear end isn’t securely in place. Link to comment Share on other sites More sharing options...
pizzaman09 Posted August 26 Share Posted August 26 Any chance your diff is locked up? Link to comment Share on other sites More sharing options...
Manche Man Posted September 12 Author Share Posted September 12 On 8/25/2024 at 6:33 PM, eaglescout526 said: How’s all the bushings back there for the leaf springs? Shackle bushings? How about the U-bolts? Sounds like to me the rear end isn’t securely in place. Rear bushings are old and worn, but not completely worn out. Haven't checked shackle bushings though. Do you mean u-joints or Ubolts? Thr joints have the evermost bit of play in them, but BARELY. Link to comment Share on other sites More sharing options...
Manche Man Posted September 12 Author Share Posted September 12 On 8/26/2024 at 6:08 AM, pizzaman09 said: Any chance your diff is locked up? No, I've been able to jack it up and turn the wheels freely by hand Link to comment Share on other sites More sharing options...
eaglescout526 Posted September 12 Share Posted September 12 37 minutes ago, Manche Man said: Rear bushings are old and worn, but not completely worn out. Haven't checked shackle bushings though. Do you mean u-joints or Ubolts? Thr joints have the evermost bit of play in them, but BARELY. U bolts. The bolts that hold the axle in place with the rear leafs. Link to comment Share on other sites More sharing options...
Manche Man Posted September 12 Author Share Posted September 12 2 hours ago, eaglescout526 said: U bolts. The bolts that hold the axle in place with the rear leafs. *smacks head* Sorry, your question makes sense now haha. No, didn't even think of checking the rear u-bolts. I'll do that when I get home tomorrow! Thank you! Link to comment Share on other sites More sharing options...
eaglescout526 Posted September 12 Share Posted September 12 2 minutes ago, Manche Man said: *smacks head* Sorry, your question makes sense now haha. No, didn't even think of checking the rear u-bolts. I'll do that when I get home tomorrow! Thank you! Lol!! Hopefully that’s it. Link to comment Share on other sites More sharing options...
Manche Man Posted November 12 Author Share Posted November 12 Alright! So, been a while, sorry guys! I decided that most likely it was the throwout bearing, SO, Because I wanted to external slave swap it anyways, I took a few days (more like evenings through midnight, brrrr) and dropped the tranny, collected the parts for the swap (F N Jeep outta Colorado Springs, GREAT guys and if they don't have your part, they will soon. Even had MJ tail lights!! I don't live there, but they ship) and then got to it! Swap was mad easy, only issue was lacking the equipment to drop and install the tranny. Got a new throwout bearing, pilot bearing, clutch, flywheel, pressure plate, throwout bearing retainer, and a slave cylinder (that is a story for another post). Swapped it all in there and after taking forever to figure out how to adapt the new clutch line to the old slave..... again, for another post, got it all running and complete. For the 30 miles it worked, no shuddering, screeching, grinding when going into reverse, or anything else! Most likely my slave cylinder wasn't working completely and the clutch was too aggressive (weird wearing/burn marks on the clutch and flywheel/pressure plate. They all were worn real hard in one or two places but good everywhere else. So, while I should still get new bushings and rubber for my suspension and the rear end, for now everything seems fine. Aside from that clutch All of you have been super helpers! I appreciate this community so much. I'll keep you all posted! -Cheers, MancheMan Link to comment Share on other sites More sharing options...
pizzaman09 Posted November 14 Share Posted November 14 Good stuff! I hope you get the clutch sorted too! I did an external slave conversion and love just how much better it works. Though I will say the clutch pedal is much heavier compared to the internal slave. Link to comment Share on other sites More sharing options...
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