All the LSx swaps have me wondering: anyone have a square 4x4 with a LSx? - The 1947 - Present Chevrolet & GMC Truck Message Board Network

arkracing · 01-24-2010, 10:37 PM

Well as some of you may know, I recently aquired a '87 K2500 GMC. A freind of mine has a '99 5.3 with supposedly 40k out of a rollover (it's been sitting in his shop for several years. Complete with all acc. & harness.

I'm wondering if the swap is as straight foward as the 2wd swap. I would probably just keep the TH400 setup that's in the truck and just run the flexplate & adaptor.

I did a search & I looked through the 4x4 section & 4x4 build section and didn't see anything (unless I missed it).

Just another option to consider

Big Port Jimmy 6 · 01-24-2010, 10:49 PM

I think that the pumpkins are on the wrong side to use the late transfer case. other than that it should be no sweat if you use the early trans and case. Jay

glock35ipsc · 01-25-2010, 10:55 AM

Check the 67-72 section. I have heard something about some sort of crossmember clearance issue with those years. Not sure exactly what, but it didn't sound like anything major. I'm probably going to do a 4.8L in my 70 K10 sometime in the near future.

bowtieguy79 · 05-11-2010, 12:57 PM

Just need to find your self a NP241 out of a 90 or 91 burb or blazer with a VSS and your golden

If you find a 241 that was behind a 700r4 you can use the 4L60E if you find one that was behind the 4spd manual you can use the 4L80E. I know of the 60E you need to retain the 99 and up t-case adapter, not sure on the 80E.

I'm in the early stages of doing this to an 83 K20

01-24-2010, 10:37 PM	#1
arkracing Weekend Warrior Join Date: Oct 2004 Location: CT Posts: 1,787	All the LSx swaps have me wondering: anyone have a square 4x4 with a LSx? Well as some of you may know, I recently aquired a '87 K2500 GMC. A freind of mine has a '99 5.3 with supposedly 40k out of a rollover (it's been sitting in his shop for several years. Complete with all acc. & harness. I'm wondering if the swap is as straight foward as the 2wd swap. I would probably just keep the TH400 setup that's in the truck and just run the flexplate & adaptor. I did a search & I looked through the 4x4 section & 4x4 build section and didn't see anything (unless I missed it). Just another option to consider __________________ -'07 GMC Sierra K2500HD -'66 C10 Suburban -'68/'71 K20 Service Bed Project -'69 Chevy C30 Mason Dump -'33Ford P/U 396ChevyPowered

01-24-2010, 10:49 PM	#2
Big Port Jimmy 6 Addicted to Rust Join Date: Dec 2009 Location: Abbeville SC Posts: 1,030	Re: All the LSx swaps have me wondering: anyone have a square 4x4 with a LSx? I think that the pumpkins are on the wrong side to use the late transfer case. other than that it should be no sweat if you use the early trans and case. Jay __________________ Current trucks: (48 GMC100 320 inliner) Gone (48 Suburban in pieces) Sold 87 GMC CCSB 5.3 4l60E Daily Driver ECTA National record holder XO/PP We never really grow up, we just learn how to act in public.

01-25-2010, 10:55 AM	#3
glock35ipsc Next project: 1970 K10 Join Date: Feb 2004 Location: Fort Collins, Colo 80524 Posts: 6,684	Re: All the LSx swaps have me wondering: anyone have a square 4x4 with a LSx? Check the 67-72 section. I have heard something about some sort of crossmember clearance issue with those years. Not sure exactly what, but it didn't sound like anything major. I'm probably going to do a 4.8L in my 70 K10 sometime in the near future. __________________ *Bob* 1970 Chevy K10 LWB "Goldie" 350/TH350 *next project!!* 1981 Chevy C10 LWB 355/TH350 - My son's truck LS SWAP FORUM! Tons of LS swap info here! PLEASE CLICK HERE TO SUPPORT THE GREATEST BOARD ON THE NET! CLICK HERE FOR THE FAQ INDEX by KRUE

05-11-2010, 12:57 PM	#4
bowtieguy79 Ephesians 2:8 Join Date: Mar 2008 Location: Delavan, IL Posts: 677	Re: All the LSx swaps have me wondering: anyone have a square 4x4 with a LSx? Just need to find your self a NP241 out of a 90 or 91 burb or blazer with a VSS and your golden If you find a 241 that was behind a 700r4 you can use the 4L60E if you find one that was behind the 4spd manual you can use the 4L80E. I know of the 60E you need to retain the 99 and up t-case adapter, not sure on the 80E. I'm in the early stages of doing this to an 83 K20 __________________ 72 Suburban making it mine My 79 C10 story 79 C10 LS swap 94 LS swapped Daily Driver Tahoe Limited Instagram - @piersonclassics 83 K20 Farm Truck Build



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