11-03-2014, 05:20 PM | #1 |
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Join Date: Jul 2008
Location: Mililani, HI
Posts: 52
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5.3/4l80e help
Been lurking on here for a while trying to figure out what to do. I recently purchased a 1970 Blazer, factory 2wd, with the 307/350 combo. Attached a couple pics of how I bought it and how it looks now. I just purchased a 5.3 out of a 2005 Tahoe that had a 4l60 behind it. I didn't get the trans with the engine. I have a build 4l80 from another project that I would like to use behind the 5.3. My question is how difficult to put it with the 5.3 in the blazer? What do I need? Or should I go with a 4l60 since that is what was behind the motor originally? I have been searching, but get conflicting info or info that is about swapping from a 60 to an 80 and didn't know if that would apply since neither trans has been in the blazer. I know I may have to get my driveshaft shortened, and need to get the computer reprogrammed. All the stuff to do with converting to EFI, I understand, it is just about the trans. Any and all help would be greatly appreciated.
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11-03-2014, 11:58 PM | #2 |
Senior Member
Join Date: Sep 2005
Location: Lewisville, Nc
Posts: 10,237
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Re: 5.3/4l80e help
You will have to add a second speed sensor to the harness and have the computer flashed for a 4l80e
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11-04-2014, 12:11 PM | #3 |
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Join Date: Dec 2013
Location: Portland, Ore.
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Re: 5.3/4l80e help
yeah i think ^ that's the most legit way to swap
more info on that here: http://ls1tech.com/forums/automatic-...l80e-swap.html here's some info from denmah's site https://sites.google.com/site/sloppy...-ls/4l80e-info i swear i have read about a swap that didn't require a segment swap in the computer, but hell if i can find that info now |
11-04-2014, 01:40 PM | #4 |
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Join Date: Sep 2014
Location: dutchess county NY
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Re: 5.3/4l80e help
I have a 80 behind my 5.3. Not a hard swap to do. Re pin trans plug, add vss, 6.0 crank spacer and bolts. I had to oblong the holes in 5.3 fly wheel for tork converter but i think you can use one from a 6.0 instead. I was going from a 400 to the 80 both were bolt on yoke so i just had to shorten my driveshaft 2 1/2 in. 80e trans segment swaped into pcm
Last edited by 656mx; 11-04-2014 at 01:45 PM. |
11-04-2014, 02:37 PM | #5 |
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Join Date: Jul 2008
Location: Mililani, HI
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Re: 5.3/4l80e help
Thanks for all the info guys! When you say re-pin, you mean pull the wire from the wrong pin and insert into the correct pin, right? Just want to be sure. Was starting to get worried when I heard about people having to pull all the extra wires and basically rebuild the wiring harness.
On a side note, I thought I knew more about the EFI swap than I do I guess. I have been doing some reading and have determined that mine is a returnless efi system. So, does that mean I can use my existing fuel tank and just use a different sending unit that will have the correct pressure? Thanks again for all the help. Also, if you know of a thread that will answer my questions without too much typing on your part, please point me in that direction. I just couldn't find the info I was looking for, or maybe I was asking the wrong questions. |
11-04-2014, 03:34 PM | #6 |
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Join Date: Sep 2014
Location: dutchess county NY
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Re: 5.3/4l80e help
http://lt1swap.com/ has lots of good info and ls1tech.
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11-04-2014, 03:59 PM | #7 |
1965 Chevy C10, 2005 4.8L/4l60
Join Date: Aug 2004
Location: DFW Texas
Posts: 8,546
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Re: 5.3/4l80e help
If your just going to cruise in the Blazer, leave the 5.3/4l60e as a match, makes things easy. If your going to cam it or turbo, then the 4l80e is a better choice.
What are you using the truck for?
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11-04-2014, 06:07 PM | #8 |
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Location: Mililani, HI
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Re: 5.3/4l80e help
Clyde65,
I am planning to mostly cruise it, but already have a cam for it. Goal is 400+ at the wheels. The reason I am wanting to go the 4l80 route is because I already have a built one, so don't have to buy a trans, and then have it rebuilt. Russell |
11-04-2014, 06:08 PM | #9 |
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Re: 5.3/4l80e help
Thanks again, for all the info from everyone.
Russell |
11-04-2014, 09:12 PM | #10 |
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Join Date: Mar 2013
Location: Marquette michigan
Posts: 828
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Re: 5.3/4l80e help
Hi Russell, i haven't paid a lot of attention on the 4l80 swap, but one item that i remember is a possible lack of room in the floor tunnel area. The trucks have a low hump and a high or tall hump. I believe the truck guys bolt in the high hump for the bigger 4l80. I assume the blazer has a removable trans hump. I'm running the factory low hump in my 68c10 with a 4l60 and its ok, close enough though. Great help on here, and some guys are modifying the stock tank for a add-0n low sump well area as a pick-up point for an external fuel pump i believe. Good luck, Brian Fuller
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