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Old 07-28-2014, 04:26 PM   #1
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What Gears

Trying to decide what gear ratio to go with for my 3.8L 6 spd manual with 33's. Looking to stay with 33's. I either want to go with 4.56 or 4.88? If anyone has these ratios on 33's with the 6 spd on the 3.8L LMK how you like them?

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2010 BLACK UNLIMITED SPORT 3.8L (6spd)
OME sport shocks/OME 2.5 Springs HD/OME FTB/RK RTB /RK Discos/OME Bumpstops/ Grade 8/Tracker 16x8.5/Duratracs 35s/TF Gussets/Eaton LSD D30-D44/OX Differential Covers/ YUKON 4.56/RANCHO Exhaust/Rancho Correction Brackets
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Old 07-28-2014, 10:25 PM   #2
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Personally, I would go 4.88 but then again I would probably put on 35's. I like to err on the performance side and can never say never when talking about bigger tires. I don't like 4.56 for the 3.8L for this reason. They are only good for 33's, no other size. So if you NEVER go bigger then 4.56 will be fine. Of course if you do go bigger, obviously 4.56 will be way ahead of 3.21 or 3.73 so there's that. I sell ring and pinion and install kits.

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Old 07-29-2014, 11:47 AM   #3
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I have to agree with Dan, if you must err do it on the side of performance. Swapping gears is costly and it is very disappointing to get mediocre results. Look at 3.8 gear chart.
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Old 07-29-2014, 05:42 PM   #4
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I think I will go with Yukon 4.56 gears. Im planning on staying with 33s, BUT if I do change my mind in the future, the future will bring me 35s. The 4.56s would be fine either or. As of now I have the sluggish 3.21 with my stock 32's which is horrible, an instant upgrade from 32 to 33 and a 4.56 I should be golden.
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OME sport shocks/OME 2.5 Springs HD/OME FTB/RK RTB /RK Discos/OME Bumpstops/ Grade 8/Tracker 16x8.5/Duratracs 35s/TF Gussets/Eaton LSD D30-D44/OX Differential Covers/ YUKON 4.56/RANCHO Exhaust/Rancho Correction Brackets
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Old 07-29-2014, 09:32 PM   #5
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Old 07-30-2014, 07:07 AM   #6
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4.88 and 35"!! I am very happy with mine.
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Old 07-30-2014, 04:02 PM   #7
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Quote:
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Do I need anything for the rear D44 besides the differential gasket, gear fluid, and ring & Pinion?
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2010 BLACK UNLIMITED SPORT 3.8L (6spd)
OME sport shocks/OME 2.5 Springs HD/OME FTB/RK RTB /RK Discos/OME Bumpstops/ Grade 8/Tracker 16x8.5/Duratracs 35s/TF Gussets/Eaton LSD D30-D44/OX Differential Covers/ YUKON 4.56/RANCHO Exhaust/Rancho Correction Brackets
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Old 07-30-2014, 05:23 PM   #8
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i can break my 33's loose in my 3.8 auto without trying with the new gearing, and couldnt with the 3.73's. im running 4.88's and i love it. youll probably be ok with 4.56 in the manual but id recommend 4.88 because these things are terrible on the pep side
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Old 08-02-2014, 08:40 AM   #9
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4.88 and 35"!! I am very happy with mine.
Can you still use the factory lockers with 4.88 gears?
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Old 08-02-2014, 01:34 PM   #10
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Do you still need a new front carrier if you add a "locker" or LSD?

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