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Ls1 to TH350 issues

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Old Dec 1, 2015 | 04:40 PM
  #1  
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Default Ls1 to TH350 issues

I am building a rock buggy, and am trying to use a 98 F-body LS1 and a th350.
The flex plate that came on the engine (stock I assume) is dished and has 2 different 3 bolt patterns, one of wich bolts to a summit 2500rpm converter I bought for it. I purchased the spacer that goes between the TC and the back of the crank, it's the press in spacer not the bolt in spacer. The issue is I put it all together and I have only about 1/16-1/8 of an inch of play forward and aft for the TC, and when you push it foreward the bolt pads are 1/8" from the flex plate. I can see that the spacer is bottomed out in the crank and there is a small gap between the face of the converter and the rear face of the spacer, but I cannot get the converter to slide forward enough to touch the flex plate.
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Old Dec 1, 2015 | 09:03 PM
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is the pilot on the convertor bigger then the pilot hole in the crank?
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Old Dec 1, 2015 | 10:06 PM
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no, the converter goes into the spacer not the crank. something is keeping it from going all the way in... I guess its time to pull it all back apart again
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Old Dec 2, 2015 | 07:12 AM
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Can you take a picture of the setup? It was so long ago when I did mine but, something doesn't sound right. I bought a flexplate specifically made to swap my TH-400 to my LQ4.
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Old Dec 12, 2015 | 07:55 PM
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I had to take an 1/8" off my spacer. I had 1/4 between the converter pads and flexplate. But the converter would only pull up and 1/8" and bottom out. Took 1/8 off the spacer and the converter pulls all the way up to the flexplate now. So I then used a 1/8" shim. This pulled the converter out of the trans 1/8" and left an 1/8" to the crank spacer for converter charge.
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