Nv3500 to 4l80e
Thread Starter
Staging Lane
Joined: Sep 2012
Posts: 53
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Nv3500 to 4l80e So there's a lot here on 4l60e to 4l80e and T56 to either auto but not a lot for the truck guys. So what I have is a 99 silverado all stock with a 4.8 and a nv3500. I also have a 2003 chevy express with a 5.3 and it used to have a 4l60e (parts rig). And I also have a 2001 4l80e. I want to put the 4l80e in my Silverado. Can I use my 03 harness and pull the trans wiring from it and add it to my 99 harness and do a reflash for 4l80e? Or do I need to find a 4l80e harness? Or is reflashing my 99 pcm to run a 4l80e even possible? Thanks for any help. Mike.
Good call moving this to the transmission section.
My response still stands:
The wiring in the harness for the auto transmission starts at the PCM so in all likelihood, a harness for a stick vehicle needs to be swapped out to use an auto.
If you have an adapter that'll go from the 4L60E plug to a 4L80E plug, great BUT you'll still need a tune to use the 4L60E.
My response still stands:
The wiring in the harness for the auto transmission starts at the PCM so in all likelihood, a harness for a stick vehicle needs to be swapped out to use an auto.
If you have an adapter that'll go from the 4L60E plug to a 4L80E plug, great BUT you'll still need a tune to use the 4L60E.
Thread Starter
Staging Lane
Joined: Sep 2012
Posts: 53
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Well I actually just found the Speartech 4l80e harness add on. It goes all the way from the pcm to the trans. Should be all I need as far as wiring, plus a reflash. Any thoughts on this?
http://www.speartech.com/product_p/4l80eaddon.htm
http://www.speartech.com/product_p/4l80eaddon.htm
Thread Starter
Staging Lane
Joined: Sep 2012
Posts: 53
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Will do. I guess I just needed to look a little harder for the part I was needing. Now I just need to figure out what flex plate I need for my long crank 4.8. I think just a flat flex plate with the spacer on the end (further from the engine) is all I need.
Well you'll certainly never break a 4L80E behind a 4.8L engine.
Choosing a flex plate: They're listed as different numbers at Rock Auto. They have a 4.8L engine with the 4L80E transmission listed in a 2008 3500 Express van. I'd say that's the one but there may or may not be a needed spacer.
Choosing a flex plate: They're listed as different numbers at Rock Auto. They have a 4.8L engine with the 4L80E transmission listed in a 2008 3500 Express van. I'd say that's the one but there may or may not be a needed spacer.
Thread Starter
Staging Lane
Joined: Sep 2012
Posts: 53
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Well my 4.8 is a long crank version. Doing some reading on it now. Looks like dished flex plate with spacer on the end. Dished flex plate to have clearance for converter bolts. And the spacer to hold the converter snout.
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Thread Starter
Staging Lane
Joined: Sep 2012
Posts: 53
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The 99-00 4.8 were long crank if the truck was originally a manual trans. I also already have a dished flex plate if for some reason I'm wrong so I may just buy a spacer and bolts so I have everything if I end up needing it.
Thread Starter
Staging Lane
Joined: Sep 2012
Posts: 53
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So I'm trying to get my trans plug all labeled so I found this link.
http://lt1swap.com/99-02_vortec_pcm.htm
and this transmission plug pin out. (Post #2 4l80e connector key)
http://www.performancetrucks.net/for...g-swap-413157/
But the only ones that match are shift solenoid a and shift solenoid b? Which go to the red pcm connector pins 47 and 48. Any suggestions or help here? Thanks.
http://lt1swap.com/99-02_vortec_pcm.htm
and this transmission plug pin out. (Post #2 4l80e connector key)
http://www.performancetrucks.net/for...g-swap-413157/
But the only ones that match are shift solenoid a and shift solenoid b? Which go to the red pcm connector pins 47 and 48. Any suggestions or help here? Thanks.