Allison 6sp: Putting 6 speed into 5 speed lly

[lyncher]

Hey guys I recently purchased a bone stock 04 lly and I have a built 6 speed out an 06 Lbz. I was wondering if I could pull the valve body out of the 5 speed and put it in the 6 speed essentially turning it into a 5 speed?


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[Mike L.]

Yes

 

[lyncher]

Thank you for the response Mike. It’s very much appreciated


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[THEFERMANATOR]

You'll need to put a Jr in your 5 speed valve body, and swap shift shafts as the 6 speed uses the internal mode switch, and the lly 5 speed uses the external single plug nsbu.

 

[lyncher]

Just ordered a transgo jr. Do I need to replace the whole shaft or just the nsbu switch or both shaft and switch?


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[THEFERMANATOR]

Both the shaft and switch. The 6 speed shaft doesn't have the collar for the external nsbu iirc, and you have to remove the shaft to get the ims out.

 

[lyncher]

Ok perfect. Thank you for the information. You definitely saved me hours of confusion and frustration.


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[Cougar281]

The shift shaft may not be different. Before you go about removing it, check to see if a nsbu will fit as is. The shaft on the 6-speed in my truck definitely did fit the nsbu on there when i had a 5-speed vb in it, and I do not recall changing it. And leaving the ims in there not connected won't hurt anything.

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