What Trany to run with ly6

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May 28, 2016 | 04:09 AM

jnitecrawler

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What Trany to run with ly6

Hi, I want to do a ly6 swap to my 1998 crew cab 3/4 ton 4x4 with 5.7 l got a used 09 ly6 with factory harness for free. I bought a crane cam 199/199for $100. I want to make the stand alone harness my self. The question is do I use the 4l80 that is in the truck and have to buy a controller for it. Or should I pick up a 6l90? The harness I have is for a 6l90, I think this would be easier swap wiring wise. I will be using the truck as a daily driver and for towing my holiday trailer. Thanks.

Last edited by jnitecrawler; May 28, 2016 at 04:31 AM.

May 28, 2016 | 07:01 AM

alocker

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The biggest issue with the 6l80/90 is they are huge. Since space is less of a concern in a truck I would go withheld 6 speed all day long.

May 28, 2016 | 07:38 AM

casias

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I would second the 6l80/90. You shouldn't have any trouble fitting it in. At most, you may have to open up the tunnel a little bit near the back.

Just make sure you get a transmission that is the same year, so you don't have trouble with the TCM not wanting to talk to the ECU. There was a change in those years (I think around 2008).

I have the 6l90 in my Dakota. It fit in that with only a small amount of pushing the tunnel, and has been a great transmission.