LS swap options - The 1947 - Present Chevrolet & GMC Truck Message Board Network

jon75 · 05-27-2013, 04:28 AM

Hey everyone. After reading several build threads with the LS (gen IV and up) engine swaps, I have some curiosity questions. I'm not quite sure of all the specifications of my truck, but I do know a couple. I know that the engine makes 160 horsepower and 255 ft-lbs of torque. What I find odd is that the transmission and transfer case don't seem to be anything special compared to today's items. I mean, a GM 4.8L V8 makes more power than that. But here is what I was thinking.....

I have a 4x4 so I only want to mess around with things one time. I want the engine, trans, and case to all be from the same vehicle or setup. So that rules out Denali and Escalades unless I swap in a different case. But what I would like is to put in a 5.3 with a 4l65E and NP241 case. I know just about every nook and cranny of these components so I know what to do before I swap them in to make for an awesome, long living combination. If the deal was right, I would go with a 6.0 with 4L80E and NP243 case, but it's a lot of extra weight in those components and I'm unsure if it would be worth the extra pounds and cost.

Let me know what you guys think....

ghettoluxury · 05-27-2013, 07:52 PM

Sounds like you have a solid plan. Unless you plan on swapping out the front axle you are going to need a NP241 case from a 90-91 Blazer or Suburban. If you are going to swap out the front axle you need one from a 77-79 Ford F250 or F350 for a direct bolt in.

jon75 · 05-28-2013, 03:24 AM

Quote:

Originally Posted by ghettoluxury

Sounds like you have a solid plan. Unless you plan on swapping out the front axle you are going to need a NP241 case from a 90-91 Blazer or Suburban. If you are going to swap out the front axle you need one from a 77-79 Ford F250 or F350 for a direct bolt in.

Why do I need to either swap the axle or get a specific case? Is that strictly so it all bolts together with no driveshaft work? If so, I would rather have my driveshafts done rather than stick in a 25 year or 35 year old part. Thank you for the information!

cletis · 05-28-2013, 07:27 AM

Late model Chevys has a drivers side drop on the t case, that is why you require a Ford front axle or a 2 year only t case.

05-27-2013, 04:28 AM	#1
jon75 Registered User Join Date: May 2013 Location: Tustin, CA Posts: 77	LS swap options Hey everyone. After reading several build threads with the LS (gen IV and up) engine swaps, I have some curiosity questions. I'm not quite sure of all the specifications of my truck, but I do know a couple. I know that the engine makes 160 horsepower and 255 ft-lbs of torque. What I find odd is that the transmission and transfer case don't seem to be anything special compared to today's items. I mean, a GM 4.8L V8 makes more power than that. But here is what I was thinking..... I have a 4x4 so I only want to mess around with things one time. I want the engine, trans, and case to all be from the same vehicle or setup. So that rules out Denali and Escalades unless I swap in a different case. But what I would like is to put in a 5.3 with a 4l65E and NP241 case. I know just about every nook and cranny of these components so I know what to do before I swap them in to make for an awesome, long living combination. If the deal was right, I would go with a 6.0 with 4L80E and NP243 case, but it's a lot of extra weight in those components and I'm unsure if it would be worth the extra pounds and cost. Let me know what you guys think.... __________________ 1975 GMC Sierra Grande K25HD 350-4BBL 4sp LWB 2009 Infiniti G37S Sedan w/Stillen sway bar kit & K&N Typhoon dual snorkel intakes ASE certified for brakes, electrical diagnostics and heating and A/C & EPA certified in R12 and R134a

05-27-2013, 07:52 PM	#2
ghettoluxury Registered User Join Date: Apr 2009 Location: Waynesfield Ohio Posts: 1,991	Re: LS swap options Sounds like you have a solid plan. Unless you plan on swapping out the front axle you are going to need a NP241 case from a 90-91 Blazer or Suburban. If you are going to swap out the front axle you need one from a 77-79 Ford F250 or F350 for a direct bolt in. __________________ 1949 Five Window, 1973 Step Side, 2000 Z71

05-28-2013, 07:27 AM	#4
cletis Registered User Join Date: Aug 2010 Location: Ontario, Canada Posts: 137	Re: LS swap options Late model Chevys has a drivers side drop on the t case, that is why you require a Ford front axle or a 2 year only t case. __________________ I think I can, I think I can, http://67-72chevytrucks.com/vboard/s...d.php?t=452601

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