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Old 09-08-2012, 01:39 PM   #1
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V-8 with 4.88 gears?

Starting research on a future v8 swap. Still deciding between a magnum or 5.3. Gotta price motors out. I have a d44 and a d30 with chromo axles which I believe should be able to handle a v8. Anyone running 33's with 4.88's? What kind of mpg are you getting and how's it on the highway. It's my dd.

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Old 09-08-2012, 04:54 PM   #2
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Gear choice should be based on tire size and what transmission you are going to use and your planned usage of the jeep. If you are using something with a steep OD( 4L60E with the 5.3 for example) then you may be ok, especially in town. You may find the highway RPM to be a little high.
If you are going with a 4sp auto with the V8 then 4.56 might be a better choice with 33s for highway running.

Right now I have 4.10s with my 5.7 Hemi/5 sp auto and 35s. I am looking to go to 4.88s whick I think will be perfect for my tire size and OD ratio. At 70mph I am right about 2150RPM. With 4.88s I should be turning about 2500.

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Old 09-08-2012, 05:03 PM   #3
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A friend installed the 5.3 and said it was barely an improvement over the 4.0L. He immediately replaced it with the 5.7 and was much happier. The right axle ratio depends heavily on your transmission choice.
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Old 09-08-2012, 06:00 PM   #4
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Well anything is an improvement over my 4cyl lol. That's why I have 4.88's. I guess I would want to set it up so I can leave my axles alone. And if the 5.3 isn't much different than the 4.0 should I go the 5.9 magnum route? Also would it be more of a hassle trying to keep my jeep a standard than just keeping whatever auto comes with the new motor?
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Old 09-08-2012, 06:24 PM   #5
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The first 5.3L made in the neighborhood of 295 HP and something over 300 ft-lbs of torque, not sure exactly how that's barely an improvement over the 4.0L. My 03 Silverado had the 4.8L/4L60E package with a 3.42 gear set. Running that with 255/70R16 tires (30x10.5x16 for comparison) I was running about 1800 rpm at 65 on the highway. 4.88 gears would be too low IMO.

Power was never an issue for my Silverado, shouldn't be one in a Jeep that's 1000 lbs lighter.
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Old 09-08-2012, 06:34 PM   #6
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Quote:
Originally Posted by Jerry Bransford
A friend installed the 5.3 and said it was barely an improvement over the 4.0L. He immediately replaced it with the 5.7 and was much happier. The right axle ratio depends heavily on your transmission choice.
Theres no way he had a stock 4.0L lol.

Thats an improvement and a half.
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Old 09-09-2012, 11:20 AM   #7
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Crawling the Jeep motor is really great. It just has a bunch of controllable torque from idle to 2000. That said. An all aluminum 5.3 is going to be way lighter than the 5.9 and a total rocketship compared to the 2.5.
AX5 =.85 od x 4.88 x 33 tires = 2900 rpm@70 mph
4l60E=.75od x 4.88 x 33 tires = 2600 rpm@70 mph
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Old 09-09-2012, 12:11 PM   #8
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5.3L engines are getting cheaper as time goes by too. A rodder's preferred swap due to ease of wiring (4 wires to hook up, as long as you get the harness and fuse block), and the popularity of the engine has made flashing of the ECM affordable and relatively easy.

There's no reason that you can't find a complete 5.3 or 4.8 drive train for about $2000. That includes the harness, ECM, fuse block, transmission and transfer case.

Here's an example of one that I've done business with when I was still in Dallas. G & R Auto Parts - Oklahoma City - Recycled GM Auto Parts

Check around, there should be one similar that's close to you.
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Old 09-09-2012, 12:57 PM   #9
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Quote:
Originally Posted by Gunner View Post
4l60E=.75od x 4.88 x 33 tires = 2600 rpm@70 mph
According to novak a good range is 2200-2700 rpm cruising with a v8 so that puts me in the range. Also I saw on the sites I looked at the 4l60e had a .7 od puting it at 2434rpm at 70 which is right in the middle of that range. And lindel there are a few yards im going to look at tomorrow on my day off. Also a car donation center near by where I might be able to buy a whole truck and scrap/ part out when im done with it. Drove by the other day and the yard was full
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Old 09-09-2012, 03:42 PM   #10
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The LS5.3 is a much better engine then the 5.9. The aluminum version weighs 90lbs less then the 4.0L. I think the 5.9 weighs 135lbs more.
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Old 09-09-2012, 07:34 PM   #11
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I have 4.88s. 5 speed, 33 inch tires. I can do 75 at 3k rpm. I don't know my MPG, but it isn't good.
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Old 09-10-2012, 10:16 AM   #12
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What motor do you have?
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Old 09-10-2012, 11:45 AM   #13
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Stock 4.0. Plenty of gonads.

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