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Old 02-15-2012, 01:56 AM
EVILBOB EVILBOB is offline
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Join Date: Feb 20, 2011
Location: Fort Worth, TX
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5.3L Vortec Swap

What kind of mpg and performance can one expect after doing an LS swap on a FSJ? I have a 2007 5.3l and 4l60 that I am getting ready to install it into my Scrambler, but I might be getting my hands on a Wagoneer. Not sure which vehicle would benefit more, so any advise would help, thanks.
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Old 02-15-2012, 10:05 AM
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fsj1979 fsj1979 is offline
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Join Date: Mar 08, 2011
Location: Prescott, Az.
Posts: 257
I am getting 16-17 mpg on mine. Mine is from an 03, but should be similar. Mine is a combo of city/highway and I'm at 5,000 feet where I live. I have heard of some guys getting as much as 21 mpg. By-the-way, welcome aboard. This place is full of GREAT info. The link to my swap is below, if you want to check it out.
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Jeff

1979 Cherokee Chief
2003 GM 5.3 liter Vortec
4L60E/ NP 241c/ Dana 44's/ 33" BFG KM2 muds/ 4" lift

My 5.3 swap: http://www.ifsja.org/forums/vb/showthread.php?t=140105
Makin' her purdy: http://www.ifsja.org/forums/vb/showthread.php?t=140286
Vid: http://www.youtube.com/watch?v=XrqX1ip2KkM

Just keep rubbin' money on it till it shines.




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Old 02-15-2012, 10:45 AM
okjeep okjeep is offline
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Join Date: Jan 08, 2008
Location: Tulsa
Posts: 359
I'm running about 10-11 in our YJ. 37's with 4:56 gears. I am looking at stepping down to 4:10's since we are running a 4.3 atlas. it's a 2009 5.3 HO with a 700r-4. I think the computer and 4l60e offers much better economy.
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Old 02-15-2012, 10:31 PM
EVILBOB EVILBOB is offline
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Location: Fort Worth, TX
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Cool

Thanks for the replies. I used to own a 76 Cherokee with a 401 and only got 11 mpg, so being able to get into the mid-to-high teens does not seem too bad. My Scrambler gets 16-18 with the 4.2 and will do great with 5.3, but I'm guessing the FSJ would benefit more for the mpg increase, due to the size and weight of the vehicle. Next thing for me to consider is the ease of the engine swap and cost...
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Old 02-15-2012, 11:08 PM
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Randyzzz Randyzzz is offline
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Join Date: Mar 03, 2008
Location: Redmond, OR
Posts: 349
I have a 5.3/4l60e/4.56/35" setup in my Scrambler. 20 mpg on the highway so far, I'm sure it will do better... It's a hoot to drive though...like a rocket ship with an on/off switch.
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Randy S.
It's not what you Buy, it's what you Build.
1987 J20 SOLD
1966 Waggy SOLD
1970 Waggy FOR SALE

1982 Scrambler FOR SALE
1981 Scrambler
Current Project
www.oldsoulsretros.com
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Old 02-16-2012, 06:45 AM
EVILBOB EVILBOB is offline
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Quote:
Originally Posted by Randyzzz
I have a 5.3/4l60e/4.56/35" setup in my Scrambler. 20 mpg on the highway so far, I'm sure it will do better... It's a hoot to drive though...like a rocket ship with an on/off switch.
Hey Randyzzz, I thought that was you from CJ-8 forum. I was looking at your build thread again and all I can say is AWESOME! I think I'll have to do the 5.3 in the CJ8, then shoot for the FSJ afterwards. I need to get get started asap or it will never get done.
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Old 02-17-2012, 01:08 AM
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Randyzzz Randyzzz is offline
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Join Date: Mar 03, 2008
Location: Redmond, OR
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Quote:
Originally Posted by EVILBOB
Hey Randyzzz, I thought that was you from CJ-8 forum. I was looking at your build thread again and all I can say is AWESOME! I think I'll have to do the 5.3 in the CJ8, then shoot for the FSJ afterwards. I need to get get started asap or it will never get done.



I'm loving the 5.3 in the Scrambler. Going to do one in the Waggy, unless I can find a smoking deal on a Hemi.
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Randy S.
It's not what you Buy, it's what you Build.
1987 J20 SOLD
1966 Waggy SOLD
1970 Waggy FOR SALE

1982 Scrambler FOR SALE
1981 Scrambler
Current Project
www.oldsoulsretros.com
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Old 02-26-2012, 12:12 PM
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Blazin71 Blazin71 is offline
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Join Date: Apr 26, 2006
Location: Aloha, Oregon
Posts: 9
74 J-Truck with mild built 401

I'm also looking to put a GM Truck Vortec 5.3 or 6.0 in my J-Truck. I only get 9-11MPG with my current AMC 401 with a mild CompCam & Edelbrock RPM AirGap w/ Holley TruckAvenger 670. Does any one know the MPG difference in stock GM Trucks between a 5.3 and 6.0 Vortec?

Cheers,

Danny
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  #9  
Old 02-26-2012, 12:18 PM
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Randyzzz Randyzzz is offline
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Join Date: Mar 03, 2008
Location: Redmond, OR
Posts: 349
When I was working for GM (2000-2004) we were seeing the 5.3's getting almost 5mpg better in Silverado 1500's, and felt peppier too. It wasn't unusual to get 20-22 highway mpg out of a stock 1500 with a 5.3. The 6.0 came into it's own towing and in the super heavy rigs, it didn't loose much MPG compared to the 5.3. (I'm talking 1 tons with loaded utility boxes- the 5.3's dropped down to 10-14 while the 6.0's were at 10-12. The 6.0 then had a better torque feel.)
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Randy S.
It's not what you Buy, it's what you Build.
1987 J20 SOLD
1966 Waggy SOLD
1970 Waggy FOR SALE

1982 Scrambler FOR SALE
1981 Scrambler
Current Project
www.oldsoulsretros.com
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