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5.9 Magnum and 904 Flexplate Problem
#1114794
11/15/11 11:50 PM
11/15/11 11:50 PM
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Joined: Mar 2003
Posts: 4,964
Tri-Cities, Washington
VITC_GTX
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There was another thread that talked about options for a flexplate used with the 5.9 Magnum and a 904. Link: https://board.moparts.org/ubbthreads/show...rue#Post6890292I ordered a stock 5.9 flexplate and bought a PTC 9.5" converter for my 5.9 magnum but it's not working. The circumference of the flex plate hits the torque converter before the mounting holes on the flexplate touches the converter. There is about a .030" gap there. I believe I could tighten the bolts up and make it contact but didn't know what type of stress this would cause and the consequences of it. Here are a couple of pictures. Please offer your opinions. Do I need to find another type of flexplate?  
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Re: 5.9 Magnum and 904 Flexplate Problem
[Re: VITC_GTX]
#1114795
11/16/11 12:14 AM
11/16/11 12:14 AM
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Joined: Feb 2005
Posts: 5,221
Branson, Mo.
joedust451
super gas
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super gas
Joined: Feb 2005
Posts: 5,221
Branson, Mo.
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I don't remember mine hitting, I ran a PTC converter also, that is strange. After looking over those pix, are the weights clearing, & also see those welded nipples on the ring gear, is the flexplate up against those?
Last edited by joedust451; 11/16/11 12:17 AM.
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Re: 5.9 Magnum and 904 Flexplate Problem
[Re: VITC_GTX]
#1114797
11/16/11 11:29 AM
11/16/11 11:29 AM
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Joined: Jan 2005
Posts: 12,492
Kalispell Mt.
HotRodDave
I Live Here
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I Live Here
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Posts: 12,492
Kalispell Mt.
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I ran accross a similar problem once before, had to get a B&M plate. The one I did it was hitting the lugs before it would go down over them. Mabey you could chuck yours in a lathe and trim the ring back, should work fine unless you are runnning EFI.
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Re: 5.9 Magnum and 904 Flexplate Problem
[Re: VITC_GTX]
#1114800
11/16/11 02:16 PM
11/16/11 02:16 PM
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Joined: Jan 2003
Posts: 26,862
Rio Linda, CA
John_Kunkel
Too Many Posts
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Too Many Posts
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Rio Linda, CA
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I think the problem is the design of the PTC ring gear mount, the previous advice was based on the use of a factory converter.
Removing material in that area on a lathe shouldn't affect the balance.
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Re: 5.9 Magnum and 904 Flexplate Problem
[Re: John_Kunkel]
#1114801
11/16/11 08:08 PM
11/16/11 08:08 PM
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Joined: Feb 2005
Posts: 5,221
Branson, Mo.
joedust451
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Branson, Mo.
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Quote:
I think the problem is the design of the PTC ring gear mount, the previous advice was based on the use of a factory converter.
Removing material in that area on a lathe shouldn't affect the balance.
 , Now my PTC 11" didn't have any issues, I'd call Kenny & see whats up, explain the problem, If anything i would just put it on a lathe & trim it down, It shouldn't hurt the balance, your not triming much weight off, plus its a total circle, should not affect anything, If it is the ring placement then you might have starter problems too.
Are you shure the weights aren't bottoming out? If you look i see that it not landing flush on the bace above the ring gear, Can you take a few close-up shots?
Last edited by joedust451; 11/16/11 08:11 PM.
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Re: 5.9 Magnum and 904 Flexplate Problem
[Re: joedust451]
#1114802
11/16/11 11:26 PM
11/16/11 11:26 PM
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Joined: Mar 2003
Posts: 4,964
Tri-Cities, Washington
VITC_GTX
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Joined: Mar 2003
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Tri-Cities, Washington
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Quote:
Quote:
I think the problem is the design of the PTC ring gear mount, the previous advice was based on the use of a factory converter.
Removing material in that area on a lathe shouldn't affect the balance.
, Now my PTC 11" didn't have any issues, I'd call Kenny & see whats up, explain the problem, If anything i would just put it on a lathe & trim it down, It shouldn't hurt the balance, your not triming much weight off, plus its a total circle, should not affect anything, If it is the ring placement then you might have starter problems too.
Are you shure the weights aren't bottoming out? If you look i see that it not landing flush on the bace above the ring gear, Can you take a few close-up shots?
I am pretty sure (98%) that the weights are not hitting. I spent a few minutes checking that out. There is a shoulder on the converter that the plate is resting on. I'm confident that cutting the flexplate down would work just fine but around here it's going to cost $60 or more to do that.
From memory, when I've installed other autos the converter and flexplate were ~3/16" apart when I prepare to bolt them together. I was hoping that the .030" shims wouldn't hurt but I would hate to cause a problem.
I'll get some additional close ups tomorrow.
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Re: 5.9 Magnum and 904 Flexplate Problem
[Re: VITC_GTX]
#1114803
11/17/11 01:33 AM
11/17/11 01:33 AM
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Joined: Feb 2005
Posts: 5,221
Branson, Mo.
joedust451
super gas
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super gas
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Branson, Mo.
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I wouldn't run shims  , you chance running the converter too far in its hub & it could damage it, plus you won't have the support of the whole circumference, just little round washers & risk too much flexing which could crack the flexplate, now if you used a shim "ring" to go around the whole area that might work, but you still risk what i said earlier in this post. I'm shure the ring gear is in the right location, you can run a straight edge across the bolt pads & measure the distance down to the top of the ring gear & varify it with PTC, If its good, Then i would just spend the 60.00 & have it done, But i would call PTC & see what they say, something ain't koshure. Did you get the 7/16" bolt holes, I never get an aftermarket mopar converter with the stock chinsy bolt holes anymore, they tend to come loose, the 7/16" most likely never will.
Last edited by joedust451; 11/17/11 01:38 AM.
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Re: 5.9 Magnum and 904 Flexplate Problem
[Re: goldmember]
#1114806
11/17/11 08:06 AM
11/17/11 08:06 AM
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Joined: Feb 2005
Posts: 5,221
Branson, Mo.
joedust451
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super gas
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Branson, Mo.
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Van, After studying it for awhile i might see the problem, the plate is resting on the belly of the converter right? And its still a good .030" away from the bolt pads right so far? If this is the cause the mounting pads for the plate are not tall enough, might be a screw up from there end.
Last edited by joedust451; 11/17/11 08:23 AM.
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Re: 5.9 Magnum and 904 Flexplate Problem
[Re: VITC_GTX]
#1114807
11/17/11 10:03 PM
11/17/11 10:03 PM
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Joined: Mar 2003
Posts: 4,964
Tri-Cities, Washington
VITC_GTX
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Tri-Cities, Washington
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OK, went out and verified some things tonight. 1. The weights are not hitting the converter. 2. The flexplate isn't hitting the belly of the conveter. 3. The distance from the mounting lugs to the ring gear is the same on the PTC converter as a stock conveter (~ .640"). 4. The outside diameter of the flexplate is 11 7/16" 5. The lip of the flexplate where the windows for the crank sensor are is what is hitting the conveter. 6. The flexplate isn't hitting the welded on ring gear or the weld itself. Here are some pics showing where it is hitting. Essentially it's hitting the shoulder where the ring gear butts up against. It is part of the face of the converter.    
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Re: 5.9 Magnum and 904 Flexplate Problem
[Re: dodgeboy11]
#1114812
11/19/11 02:42 AM
11/19/11 02:42 AM
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Joined: Feb 2005
Posts: 5,221
Branson, Mo.
joedust451
super gas
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super gas
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Branson, Mo.
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Quote:
Perhaps the problem lies with the flange on the flexplate. It won't affect the balance if you take a grinder to the lip. Just tape a line around the edge and remove the amount you need evenly all the way around. It won't take much and you'll save yourself the money and time of taking it to a shop.
I agree, if you have a grinder, I myself (having a steady hand) would use a cut-off disc on it, heck even a dremel, just buy a couple cups of the thin cut-off disc & have at it, may take an hour or so, run tape around it & cut off about .40"-.050" & your set. If you have a table vice, just snug it up so its steady & go to town  .
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Re: 5.9 Magnum and 904 Flexplate Problem
[Re: joedust451]
#1114813
11/19/11 12:25 PM
11/19/11 12:25 PM
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Joined: Mar 2003
Posts: 4,964
Tri-Cities, Washington
VITC_GTX
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master
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OP
master
Joined: Mar 2003
Posts: 4,964
Tri-Cities, Washington
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Quote:
Quote:
Perhaps the problem lies with the flange on the flexplate. It won't affect the balance if you take a grinder to the lip. Just tape a line around the edge and remove the amount you need evenly all the way around. It won't take much and you'll save yourself the money and time of taking it to a shop.
I agree, if you have a grinder, I myself (having a steady hand) would use a cut-off disc on it, heck even a dremel, just buy a couple cups of the thin cut-off disc & have at it, may take an hour or so, run tape around it & cut off about .40"-.050" & your set. If you have a table vice, just snug it up so its steady & go to town .
I definitely think I have the tools/skills to do this but I didn't know how close I had to be to keep it in balance. I would hate to have a vibration or to do damage to the bearings.
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I would not try that 
