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Old November 24th, 2013, 11:45 AM   #1
babyjp95
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Gm 5.3 swap.

Wondering what kind of gas mileage everyone is getting with theirs. Looking at doing it to my YJ. It's in 33's with 4:11 gears. Has a four popper right now but don't want to loose mileage cause I also have a 08 rubi with 5.7 hemi that gets like 11. So I drive the YJ back n forth to work for its mileage. Thx for your input.
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Old November 24th, 2013, 11:50 AM   #2
montecarlo33
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With my 5.3 swap in a 4l60e and its 2wd but without any cats, egr system blocked off and turned off in the computer and a premium fuel tune. I figure I get around 12-16 just driving around, but its hard to keep my foot out of it. just slightly worse then my 2006 Silverado z71 with a 5.3 and 285's did. I only could pull 14-15 in the city and 18-20 on the hwy out of that truck so Im pretty happy with what I get with my swap.

Last edited by montecarlo33; November 24th, 2013 at 11:53 AM.
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Old November 24th, 2013, 11:51 AM   #3
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In a Jeep?
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Old November 24th, 2013, 11:54 AM   #4
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In a Jeep?
No. My swap is in a 2wd 92 Chevy pickup.
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Old November 24th, 2013, 11:55 AM   #5
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Ok. Thanks bud.
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Old November 24th, 2013, 11:56 AM   #6
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the new 2011 and up Chevy 5.3L trucks are getting 21 mpg highway. Look it up on youtube.
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Old November 24th, 2013, 11:56 AM   #7
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Thx
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Old November 24th, 2013, 11:57 AM   #8
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Ok. Thanks bud.
And for the record the swap was worth every penny. I really had no idea how much power this motor had until all the computer bullshit like torque management and things like that are turned off. You won't be disappointed with the power.
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Old November 24th, 2013, 04:07 PM   #9
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5.3 and dana 30/35's.....
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Old November 24th, 2013, 04:10 PM   #10
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Yes. 30/35 combo.
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Old November 24th, 2013, 04:21 PM   #11
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Take it easy on them axles, I popped mine with the 4 banger.
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Old November 24th, 2013, 04:22 PM   #12
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I have too. It's going to mostly street driven n maybe dunes
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Old November 24th, 2013, 06:24 PM   #13
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Quote:
Originally Posted by montecarlo33 View Post
With my 5.3 swap in a 4l60e and its 2wd but without any cats, egr system blocked off and turned off in the computer and a premium fuel tune. I figure I get around 12-16 just driving around, but its hard to keep my foot out of it. just slightly worse then my 2006 Silverado z71 with a 5.3 and 285's did. I only could pull 14-15 in the city and 18-20 on the hwy out of that truck so Im pretty happy with what I get with my swap.
Who did your harness and computer?


I'm going to be going from the 4.3 to 5.3 in my Toyota.
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Old November 24th, 2013, 10:20 PM   #14
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Who did your harness and computer?


I'm going to be going from the 4.3 to 5.3 in my Toyota.
I cut and pasted this from another post from me in another thread, funny enough its was almost the same subject
2008 chevy 5.3 wiring in 90 yj Swap - Great Lakes 4x4. The largest offroad forum in the Midwest

Just found the company I used on ebay again. I wouldn't hesitate to use them again to rework a harness. However I will be using someone local to tweak the tune and fix my tach signal strength now that its in the truck, but the tune they provided works great just I believe it could be squeezed a bit more. But technically this company backs their tunes and will retune or fix anything free of charge if you ship the computer back to them.

http://www.ebay.com/itm/wiring-harne...71e215&vxp=mtr
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Old November 24th, 2013, 10:23 PM   #15
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Yes. 30/35 combo.
Yeah I don't see them lasting long but will get you by until you find larger replacements. I missed that part the first time I read this post. At the very least I would plan on a 8.8 rear axle swap, tons of info on it on here.
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Old November 25th, 2013, 12:25 AM   #16
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all actuality I've blown up an 8.8 as easily and fast as i have a 35, my personal opinion they r as weak as a 35. a 44 is in the future but just the 5.3 for now.
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Old November 25th, 2013, 12:46 AM   #17
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all actuality I've blown up an 8.8 as easily and fast as i have a 35, my personal opinion they r as weak as a 35. a 44 is in the future but just the 5.3 for now.
An 8.8 is WAY stronger than a 35. I beat the snot out of my 8.8 locked with 36s and 40s with zero issues. I would use an 8.8 over a 44 any day.
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Old November 25th, 2013, 01:33 AM   #18
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Copied from pirate4x4

"The 8.8 not only has a larger ring diameter, it also has has 1.62" pinion shaft, and even that, doesnt tell the whole story. If you remove the ring and pinions from a D44 and an 8.8 and side by side compare them, you will without a doubt, know which one is built to handle more abuse. the 8.8 is huge in mass compared the 44. Warn did a break test on stock D44 and 8.8 axle shafts a few years ago in one of the off road rags. The results had the D44 breaking at about 4200 pounds per foot of rotational twist, but with the 8.8 they couldnt get an actual result..... because at the 6400 lb limit of the machine, the 8.8 axles were still holding tight."
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Old November 25th, 2013, 05:05 AM   #19
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I have a 5.3l in my YJ the rear axle lasted maybe 4 months I switched it with an 8.8. My gas mileage is about 16-18, and I had http://www.lsx-harness.com/about.html do the harness they were fast and I haven't had any problems. They were also cheaper then a lot of the other places.
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Old November 25th, 2013, 08:46 AM   #20
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I have a 5.3l in my YJ the rear axle lasted maybe 4 months I switched it with an 8.8. My gas mileage is about 16-18, and I had http://www.lsx-harness.com/about.html do the harness they were fast and I haven't had any problems. They were also cheaper then a lot of the other places.
WOW! someone actually answered his question instead of spewing there own thoughts about his set up.

Thanks you as this is something I've also been wondering.

as to all the axle comments, to each their own, every set up will be different, used different, and last different, depending on tires size and how heavy his foot is, I could see the 30/35 possibly being ok for street use. I also believe in building is stages. Replacing all major components at once is not always a good option for some people for many different reasons. Often many projects never get finished because people lose interest when there's too much work or too much down time.
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