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4.8 to 6 speed

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Old May 28, 2007 | 11:49 AM
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Default 4.8 to 6 speed
I have heard that early 4.8 won't work with a six speed. Is this true?
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Old May 28, 2007 | 11:53 AM
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news to my ears. What year do you have? The only thing that is an issue is that the crossmember is a bit different on the 99-00 trucks so it won't bolt right in.
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Old May 28, 2007 | 12:04 PM
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It's a 2000, I read the a4-m6 thread, and saw about the cross member. But thought someone mentioned problems with early 4.8s.
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Old May 28, 2007 | 02:03 PM
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hell try it and see, if it doesn't after the crossmember is fixed get you a 6.0 and you know it'll mate to that
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Old May 28, 2007 | 03:07 PM
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Originally Posted by willymac
hell try it and see, if it doesn't after the crossmember is fixed get you a 6.0 and you know it'll mate to that

I like the way you think.
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Old May 28, 2007 | 08:28 PM
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thats my future plans for my truck but i doubt it will ever happen, i'd love to get rid of this 4.3 and 5speed, i may buy a beater later on and do it to it
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Old May 29, 2007 | 09:44 AM
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The early 4.8's with 5spds have a different crank. The flywheel mounting flange sticks out further and it requires you to space the transmission back a little bit from the bell housing.
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Old May 29, 2007 | 09:50 AM
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Is it a flange or a just a spacer like on the 6.0? I removed the spacer on my 6.0 crank yesterday, it'll fix my Trans Am, so that just saved me $50.
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Old May 30, 2007 | 02:27 PM
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I believe it's the actual crank, like the 99-2000 6.0's. I've never seen one, but there was a guy on here that did the swap and he ran into this issue. I'll see if I can dig up his name.
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Old May 30, 2007 | 02:31 PM
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https://www.performancetrucks.net/fo...ght=t56+spacer


Here ya go!
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