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4L80 swap

MrFlorida

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I am new here so Id first like to say hello to all and God bless, hopefully I can be of some use to you all as well. Well here goes nothing. I own an ol 1991 chevy 3500 dually single cab dont know if it was the original engine or not as I am not the first owner but it currently has the 454 powered by the famous th400. I am in the process of plotting an overhaul installing the Lq9 the engine I am sure will fit without issue as the engine compartment is massive, my question is will the 4L80 fit or will I be up the creek in headache? Thanks in advance.
 

MrFlorida

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Will L. Thank you kindly sir the information is not going to waste I assure you that thanks for taking the time to provide this. Hopefully I will be able to return the favor.
 

MrFlorida

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All 91 8 lugs came stock with a 4l80e, square body as well as gmt400, so somebody has swapped yours out before.
Man O man, go figure. All things considered it sounds like there won't be anything to concerning to scratch me head on. Thank you kindly sir knowledge truly is power.
 

EWC

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Which series truck do you have ? Old body style is R/V , newer is the C/K series .
 

EWC

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Yep , they came stock . I did one in my 86 . Had to move the crossmember back , shorten the driveshaft and do a little on the shift linkage . . You should have holes in the frame to move the crossmember back and deal with the driveshaft . And figure out what was done to the electrical part of the trans .
 

MrFlorida

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Yep , they came stock . I did one in my 86 . Had to move the crossmember back , shorten the driveshaft and do a little on the shift linkage . . You should have holes in the frame to move the crossmember back and deal with the driveshaft . And figure out what was done to the electrical part of the trans .
Whewww... music to my ears sounds straight forward enough. I will definitely get right on that, I figure I can purchase a new 4l80e for around 2k or so. Thank you kindly sir
 
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