flexing all day long! ( not suspension either) - JeepForum.com
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post #1 of 33 Old 03-11-2013, 11:20 PM Thread Starter
stuckparatroope
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flexing all day long! ( not suspension either)

So I have searched every forum I can think of for days and still yet to find a solution. Bought jeep with bad flex plate(999)...replaced it, broke another within 30 miles. alignment is perfect, even put in new dowel pins, no crank walk, input shaft play. Dropped trans and found that it broke identical to the first one. Scratched my head for a day or two, and bought a new torque converter, went to install new tc and found that it would wobble left, right, up, down about 1/4" either direction when fully seated. It did hit the inspection plate but not until maybe the last 10 miles before it broke again. Having the tranny rebuild done now, but I'm not sure if that was even the cause. 100,000 miles on the motor and its tight, runs smooth. I have seen lots of threads with people with same issue but it is either never resolved or it's something that I have already ruled out...any help!!?


"If a trail breaks your jeep....this is a formal insult, grounds for retaliation from the jeep gods in the form of a motor swap, bigger lift kit, bigger tires, and a grudge run at it....break out your cameras boys...and, WATCH THIS!!!!" - last words before the demise of my favorite jeep!

Last edited by stuckparatroope; 03-11-2013 at 11:43 PM.
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post #2 of 33 Old 03-12-2013, 02:24 AM Thread Starter
stuckparatroope
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Bump

"If a trail breaks your jeep....this is a formal insult, grounds for retaliation from the jeep gods in the form of a motor swap, bigger lift kit, bigger tires, and a grudge run at it....break out your cameras boys...and, WATCH THIS!!!!" - last words before the demise of my favorite jeep!
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post #3 of 33 Old 03-12-2013, 06:24 AM
87TPIYJ
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Are you saying that the TC wobbled when (A) bolted to the flex plate or (B) when you put it on the input shaft?

(A) bent flex plate or crank

(B) bent input shaft/ bad bearings

87 YJ, 350 TPI, NV4500, 35x12.50x17, SOA, Locked front, 8.8 LSD rear, Flat skid
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post #4 of 33 Old 03-12-2013, 12:35 PM
lobukjeep
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Where is the break?Around the perimeter of the mounting holes?

"We don't call you son 'cause your bright"
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post #5 of 33 Old 03-12-2013, 01:05 PM Thread Starter
stuckparatroope
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The break is right around the center of the flexplate around the bolt pattern. The tc was wobbling on the input shaft, almost like the shaft was too small??? The crank runs true to best of my knowledge, couldn't find anything to suggest it was engine related, I know you really aren't supposed to..., but I started the Heep with the torque converter unbolted to see if the flexplate ran true, and it was, so I'm thinking it was maybe a compounding problem with the tc. And the trans input/ stator support shaft play, got a great deal on the rebuild and I wanted a shift kit in it anyways, so I'm about to just put it back together once the trans is done and see what happens to it.

"If a trail breaks your jeep....this is a formal insult, grounds for retaliation from the jeep gods in the form of a motor swap, bigger lift kit, bigger tires, and a grudge run at it....break out your cameras boys...and, WATCH THIS!!!!" - last words before the demise of my favorite jeep!
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post #6 of 33 Old 03-12-2013, 05:11 PM
87TPIYJ
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Quote:
Originally Posted by stuckparatroope View Post
The break is right around the center of the flexplate around the bolt pattern. The tc was wobbling on the input shaft, almost like the shaft was too small??? The crank runs true to best of my knowledge, couldn't find anything to suggest it was engine related, I know you really aren't supposed to..., but I started the Heep with the torque converter unbolted to see if the flexplate ran true, and it was, so I'm thinking it was maybe a compounding problem with the tc. And the trans input/ stator support shaft play, got a great deal on the rebuild and I wanted a shift kit in it anyways, so I'm about to just put it back together once the trans is done and see what happens to it.
Sounds like you got it figured out.

87 YJ, 350 TPI, NV4500, 35x12.50x17, SOA, Locked front, 8.8 LSD rear, Flat skid
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post #7 of 33 Old 03-12-2013, 05:42 PM Thread Starter
stuckparatroope
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I really hope this is the end of it...tranny has been dropped twice and I'm getting some strange looks from my neighbors... especially when my wife crawls out from under my jeep with me....in carhartts(..mine)....covered in grease, and we are both cussing and scratching our heads lol. I have been using my powers of deductions to figure this one out! Is there ANYTHING else ANYONE knows about that causes this?! Thanks for the help guys

"If a trail breaks your jeep....this is a formal insult, grounds for retaliation from the jeep gods in the form of a motor swap, bigger lift kit, bigger tires, and a grudge run at it....break out your cameras boys...and, WATCH THIS!!!!" - last words before the demise of my favorite jeep!
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post #8 of 33 Old 03-12-2013, 07:01 PM Thread Starter
stuckparatroope
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I just saw that some people had a spacer ring behind the flex;pate.... any suggestions if this is necessary?...I don't have one..

"If a trail breaks your jeep....this is a formal insult, grounds for retaliation from the jeep gods in the form of a motor swap, bigger lift kit, bigger tires, and a grudge run at it....break out your cameras boys...and, WATCH THIS!!!!" - last words before the demise of my favorite jeep!
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post #9 of 33 Old 03-12-2013, 07:22 PM
lobukjeep
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You better make sure its supposed to have one..if you move that flex plate in or out in correlation to the starter it can effect the engagement of starter..which could chew up your ring gear...

"We don't call you son 'cause your bright"
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post #10 of 33 Old 03-12-2013, 09:48 PM Thread Starter
stuckparatroope
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I agree, I know that some motors have some tc slop until bolted up, and the crankshaft holds it on the lip...I'm asking because I have heard that some of the 4.2's had them...I have seen a few on the 4.0's but maybe I just have never really noticed....anyone had their 4.2 apart lately?

"If a trail breaks your jeep....this is a formal insult, grounds for retaliation from the jeep gods in the form of a motor swap, bigger lift kit, bigger tires, and a grudge run at it....break out your cameras boys...and, WATCH THIS!!!!" - last words before the demise of my favorite jeep!
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post #11 of 33 Old 03-12-2013, 11:06 PM Thread Starter
stuckparatroope
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Bump

"If a trail breaks your jeep....this is a formal insult, grounds for retaliation from the jeep gods in the form of a motor swap, bigger lift kit, bigger tires, and a grudge run at it....break out your cameras boys...and, WATCH THIS!!!!" - last words before the demise of my favorite jeep!
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post #12 of 33 Old 03-13-2013, 12:29 PM
Yarz
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my 4.2 and 999 combo had that spacer. I took it apart without paying a lot of attention, so I can't confirm if it went in front of or behind the flexplate

not sure on the tc slop you mentioned either

"Build a man a fire, and he'll be warm for a day. Set a man on fire, and he'll be warm for the rest of his life."

1990 White YJ TBI350, SM465, NP231, SOA, RE 1.5" SOA springs, Ford 8.8, D30, 4.10's, JBConversions SYE, XJ shaft, Bilstein 5150s, jb4x4 steering, MORE SS brakelines, 35x12.50 15 MT's, '95 YJ Brake Booster, '78 Grand Marquis MC, ZJ Prop. Valve
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post #13 of 33 Old 03-13-2013, 01:03 PM Thread Starter
stuckparatroope
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Join Date: Mar 2013
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I'm pretty sure it goes on the outside, problem is.... I can't find a replacement! Anyone know where I can get another? Thanks

"If a trail breaks your jeep....this is a formal insult, grounds for retaliation from the jeep gods in the form of a motor swap, bigger lift kit, bigger tires, and a grudge run at it....break out your cameras boys...and, WATCH THIS!!!!" - last words before the demise of my favorite jeep!
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post #14 of 33 Old 03-13-2013, 01:25 PM
OKwranglerYJ
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If the 4.0 and the 4.2 have the same spacer, I have one you can have.
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post #15 of 33 Old 03-13-2013, 02:03 PM Thread Starter
stuckparatroope
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1990 YJ Wrangler 
 
Join Date: Mar 2013
Location: kernersville
Posts: 52
That would be awesome, I'm gonna do some research and see if I can find out if they are interchangeable

"If a trail breaks your jeep....this is a formal insult, grounds for retaliation from the jeep gods in the form of a motor swap, bigger lift kit, bigger tires, and a grudge run at it....break out your cameras boys...and, WATCH THIS!!!!" - last words before the demise of my favorite jeep!
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4.2 , flexplate , transmission help , transmission issue

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