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Old 04-22-2019, 03:01 PM   #1 (permalink)
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4L80E question, would appreciate help

I am trying to help a poor friend. He has a 2004 Silverado with a 4.8, trans is bad. I offered my shop and time to swap his trans out. He showed up with a 1996 trans that someone told him will work. 96 trans says 616CJDY4665(5?)45. from what I read, it seems possible. But I'm sure some of you know exactly what needs to be done. I only get one day off so I want my ducks in a row if we're going to do it in one day. Plan on rebuilding the bad trans and putting back in. They have to have it to drive. No 3-4 gear presently. Thank you.
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Old 04-22-2019, 05:43 PM   #2 (permalink)
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going from a 4l60 to 4l80 isn't a bolt in swap. Need to repin the trans plug, add two wires, reprogram the ECM to run the 4l80. Then there is the t-case, might get lucky and be able to just put in a new input to match the 32 spline of the '80. I think just need to move the crossmember back. Be easier to get another 4L60.
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Old 04-22-2019, 08:30 PM   #3 (permalink)
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Yes a 32 spln input can be directly swaped into his tcase
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Old 04-22-2019, 09:53 PM   #4 (permalink)
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Im not 100 sure about the 4l80's but i know from 1995 to 2000 the 4l60's went through a bunch of changes on torque converter stuff...half lock up to full lock up later in the years, how lockup was controlled, how pressure was controlled, etc. I would assume that the 4l80's went through this same crap.

Ive always went by rule of thumb that LS engine powered needs to stick with 2000 and newer trans as far as electronic controlled ones.

Like mentioned above a segment swap in the ecm will be necessary, wiring harness pins will need to be moved, trans crossmember modified, drivelines modifications (lengthen front and shorten rear) more than likely, etc.
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Old 04-23-2019, 04:46 AM   #5 (permalink)
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Quote:
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I want my ducks in a row if we're going to do it in one day. Plan on rebuilding the bad trans and putting back in.
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Be easier to get another 4L60.

I am by no means an expert here, but the above just makes sense time and money wise.....
I'd try and sell/trade that 80E for a quick an easy swappable 60E. I'd imagine there is more desire/demand for an 80E vs a 60E
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Old 04-23-2019, 07:45 AM   #6 (permalink)
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Sell the 4L80, you'll piss more money away getting it to work than worth. Rebuild the 4L60e its not that hard tons of videos and how to's on youtube. Parts kits are pretty cheap.
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Old 04-23-2019, 05:57 PM   #7 (permalink)
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Gonna need a flywheel from a 6.0/80e truck as well
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Old 04-24-2019, 01:12 PM   #8 (permalink)
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Thanks for the replies. Yesterday was long. He found a 96 4L60E and is that more doable? It is one piece case. The shifter parts on left side look like they will swap. Both have green round plugs on right side. Are we closer? Speed sensor looks like will work. I actually checked myself. Thanks for the help. Do I need the spacer on crank to move flywheel?
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Old 04-24-2019, 10:42 PM   #9 (permalink)
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It should work as long as he uses a 6.0 flywheel for an 80e. there are different bellhousings on the LS style motors 60e that are shorter than the one piece style

In all honesty, if he's a "poor" friend, he is still gonna be money ahead getting the proper transmission, or rebuilding the one he has. the differences in the trannys is gonna cause you nightmares in other places....drivelines, xmember bolts, etc.

Go buy a trans rebuild book and rebuild the core he has. Best bang for the buck, and you'll both learn something. Or hunt until you find a good used runner.
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Old 04-25-2019, 10:38 AM   #10 (permalink)
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Yeah he's poor. Plus he spent his money on this other trans that the guy told him would fit....now can't find that fella. That was all old news when I learned he had trans trouble.

Basically will the trans couple up to the engine? I can do a cross member Fab. If I swap out the left side shift plug. Right side plug is the same. It's a 96 60E replacing an 04 60e.
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Old 04-25-2019, 01:25 PM   #11 (permalink)
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The question is whether a 1996 model 4L60 can be used to replace a 2004 model 4L60. The original title does state 4L80 which caused the confusion.

In any case, I would fully expect there to be some differences between a 1996 and 2004 model year transmission. You are talking about different generation trucks with different engines.........of course you also have to consider that there were different variations of the trans made for each year depending on what vehicle they are used in. Doing a quick search on reman'd trans there different part numbers between those years, and several different part numbers for each model year. There is also a chance the '96 trans will bolt right up to the 2004 and work fine, or maybe just require a few odds and ends be swapped between the trans. But I would also be prepared with a backup plan in case something didn't work out. Pretty sure there were some changes to the input shaft and torque converter with the introduction of the LS series engines in '99, but not sure if that will cause a physical fitment issue when bolting them up. Biggest concern I would have is the electronics being different (different signals, different programming, different pin outs, etc...).
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Old 04-25-2019, 04:23 PM   #12 (permalink)
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Like I already said... the bellhousing isn't going to work with the 4.8 unless you use the same stuff that would mate a 6.0 up to an 80e. this means the the transmission and tcase will be moved further back, along with the xmember needing to be further back, and neither the front of rear drivelines being the proper length anymore. Electronics is another issue all together that may be different. I know at some point near the LS series engines the pump control went from a solenoid type control to PWM.

Christ put it in a see if it all works. Best advice anyone on here has given you yet is to get the correct transmission. tell the poor buddy to sell the 80e, sell his 60e core, and find a way to make a few extra bucks to get the proper tranny.
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Old 04-26-2019, 04:10 AM   #13 (permalink)
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In all honesty, if he's a "poor" friend, he is still gonna be money ahead rebuilding the one he has.

Go buy a trans rebuild book and rebuild the core he has. Best bang for the buck, and you'll both learn something.
Enough chatter, Seriously, this IS the best option right here....a rebuild kit, a book/U-tube, and some beer for when you're done.
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Old 04-26-2019, 11:11 AM   #14 (permalink)
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Enough chatter, Seriously, this IS the best option right here....a rebuild kit, a book/U-tube, and some beer for when you're done.
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Rebuild, throw a Transgo Shift kit in and call it a day
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