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extended crank and what trans

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Old Nov 15, 2009 | 06:34 PM
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Default extended crank and what trans

So i picked up a 4.8l ls and didn't notice it had the longer crank out the rear, thought it was just the 6.0l that came with 4l80's. So from my research and understanding the converter on the 4l80s is like the old sbc/bbc, w th350,th400 ect... The longer ls cranks require a flat flexplate and maybe a spacer. The same spacer is available to put on a standard ls crank to make a th350/th400 ect.. work w the curved flexplate.

If and what is needed to be able to use the motor and not let it go to wast but not invest much into it?

Last edited by socal; Nov 15, 2009 at 07:03 PM.
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Old Nov 16, 2009 | 04:05 PM
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if it has an extended crank, just a flat flywheel should mate it up to a 350-400 etc with a stock style converter
make sure it doesnt have a spacer though
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Old Nov 16, 2009 | 04:58 PM
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Originally Posted by socal
So i picked up a 4.8l ls and didn't notice it had the longer crank out the rear, thought it was just the 6.0l that came with 4l80's. So from my research and understanding the converter on the 4l80s is like the old sbc/bbc, w th350,th400 ect... The longer ls cranks require a flat flexplate and maybe a spacer. The same spacer is available to put on a standard ls crank to make a th350/th400 ect.. work w the curved flexplate.

If and what is needed to be able to use the motor and not let it go to wast but not invest much into it?
The 4.8l was used in full size vans with the 4l80 and the longer cranks were used with the NV3500 in the full size trucks with the 4.8l.

You can use the a 4l80 or 700r4. The4l60 will work with an old style convter.
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Old Nov 16, 2009 | 08:38 PM
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sounds good thats what i thought flat flexplate, no spacer and old style trans thanks
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