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Old 10-10-2010, 12:17 AM   #1 (permalink)
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Th400 to 4l80e Swap

I am considering swapping the th400 to a 4l80e in my 88 suburban 3/4 ton. I have been told you can repin the ECM for speed senor and that the tcase adapter will bolt right up. Has anyone done this? did you run into any major issues?
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Old 10-11-2010, 04:48 AM   #2 (permalink)
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i'm pretty sure the pcm won't control the 4l80e. later model trucks it can be done, but it still requires a 4l80 transmission tune to be flashed into the pcm. I think your choices will be a manual valve body or a stand alone controler
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Old 10-11-2010, 04:55 AM   #3 (permalink)
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far as i know, re pinning the harness was only between a 4l60e/4l80e transmission
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Old 10-11-2010, 05:11 AM   #4 (permalink)
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Originally Posted by confederate muscle View Post
far as i know, re pinning the harness was only between a 4l60e/4l80e transmission
this.... 99 and up can be done, don't think the tbi can do it
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Old 10-11-2010, 07:24 AM   #5 (permalink)
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The harness won't have the correct plug on the end of it, the big plug started in '93 with the first 4L60E. Yours just has the 4-pin plug for TC lock-up. The TBI box can handle it - at least the correct one can. The 4L80E was first available in '91 with the 454SS truck, it was TBI.
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Old 10-11-2010, 09:13 AM   #6 (permalink)
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Quote:
Originally Posted by confederate muscle View Post
far as i know, re pinning the harness was only between a 4l60e/4l80e transmission
Yes. Not much different from 60e-80e harness plug. Do aways with one wire, swap a couple, and add one wire for the extra VSS that the 80e requires. THis is for 96+ vortecs. Bggrnchvy di the 60-80e swap and it was fairly simple to make it happen.

I am not certain how the wiring was on the TBI's with an 80e.
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Old 10-11-2010, 10:09 AM   #7 (permalink)
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4l80 was available in 91 not only the 454ss trucks had them there is a supposed 4l80/ 205 combo for that year aswell
long story short there is a factory tbi pcm that will control the 4l80
best bet is one from 91-93
94-95 will work but there is something funky about the harness (extra plug)iirc
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Old 10-11-2010, 10:58 AM   #8 (permalink)
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Originally Posted by BigBlocksRule View Post
The harness won't have the correct plug on the end of it, the big plug started in '93 with the first 4L60E. Yours just has the 4-pin plug for TC lock-up. The TBI box can handle it - at least the correct one can. The 4L80E was first available in '91 with the 454SS truck, it was TBI.
The 454ss came with a turbo400.
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Old 10-11-2010, 02:06 PM   #9 (permalink)
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What about adapting a chevy van harness..I just scrapped the company van with a nblow 4l80e and tbi 350.. It was a 93

i would think the ecm harness and the vans pcm harness isnt that much different..
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Old 10-11-2010, 04:31 PM   #10 (permalink)
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my 4l80e that i have was behind a 93 454 tbi it has an extra computer to control the trans

any ways the easy way of swaping it is getting a vacume modulator kit for the 4l80e

cant beat $115

http://cgi.ebay.com/ebaymotors/Trans...Q5fAccessories
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Old 10-12-2010, 09:10 AM   #11 (permalink)
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Originally Posted by kenbo53 View Post
The 454ss came with a turbo400.
Only in '90, they had the 4L80E in '91 - '93.

and that vacuum modulator kit is a band-aid for a supposed 4L80E problem, it will NOT take the place of the computer. You can get a full manual valve body, but you totally lose automatic shifting.

It should be easy enough to junkyard source a '91 - '95 harness and ECM for the TBI and 4L80E, take care of everything at once.

Last edited by BigBlocksRule; 10-12-2010 at 09:13 AM.
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Old 10-12-2010, 10:24 AM   #12 (permalink)
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^ I am corrected sorry bout that

Last edited by kenbo53; 10-12-2010 at 10:31 AM.
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Old 10-12-2010, 11:07 AM   #13 (permalink)
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Originally Posted by BigBlocksRule View Post
Only in '90, they had the 4L80E in '91 - '93.

and that vacuum modulator kit is a band-aid for a supposed 4L80E problem, it will NOT take the place of the computer. You can get a full manual valve body, but you totally lose automatic shifting.

It should be easy enough to junkyard source a '91 - '95 harness and ECM for the TBI and 4L80E, take care of everything at once.
dont the mvb come with this in the kit to control line presure.

i have not done it my self but i have read over on ls1tech about many members using it to take place of the ecm and it shifts like a normal trans would after proper instlation with out a mvb

Last edited by mog-10; 10-12-2010 at 11:07 AM.
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Old 10-12-2010, 12:31 PM   #14 (permalink)
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The LS1 boys all have computers in their cars that handle the 4L80E, all the vac modulator does is changes shifting/holding. Believe me, if you could control one of these without the computer, the 5 cores I have would be worth a lot more than $500 apiece!
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Old 10-12-2010, 03:37 PM   #15 (permalink)
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Quote:
Originally Posted by mog-10 View Post
my 4l80e that i have was behind a 93 454 tbi it has an extra computer to control the trans

any ways the easy way of swaping it is getting a vacume modulator kit for the 4l80e

cant beat $115

http://cgi.ebay.com/ebaymotors/Trans...Q5fAccessories
can you explain this ? i thought only 1991 1ton diesel with 4l80e had that stand alone computer ?
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Old 10-12-2010, 04:41 PM   #16 (permalink)
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4l80 swap

You will also need an adapter (GM part #15724745). I thihk it lists for $71.38. TH400 and 4L80E transmissions have the same bolt patern but a different sized indexing ring. Also your stock adapter would hit the oil pan of your 4L80E. I would recomend Compushifts controller. It's not the cheapest but it works very good and does not require a laptop to program it. The cheapest i have seen it is $1100 (with the display) on Ebay.
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Old 10-12-2010, 06:41 PM   #17 (permalink)
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can you explain this ? i thought only 1991 1ton diesel with 4l80e had that stand alone computer ?
it is what the guy told me when i bought it he asked if i wanted it i said no he swaped over a nv4500 so he said he was not going to need it.
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