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Old 03-13-2014, 06:43 AM   #1
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3.73 and 285's

I haven't heard much about this and haven't had much luck on a search. Who's running 3.73 gears on a 3.8 auto and 285-70's? I'm curious about the loss of power, RPM, and what cruising rpm you guys are at at normal speeds (35,45,55 and 70-70+. Also how much is it jumping back and forth between gears? My current set up is rubicon take offs and it's just fine, a little sluggish in OD off the bad but just fine in my opinion. Thanks guys

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Old 03-13-2014, 07:08 AM   #2
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I have 3.21's and 285/75r16's and I haven't noticed any loss in power. At 60mph I run about 2.2k rpm in 5th gear

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Old 03-13-2014, 07:08 AM   #3
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I have no issues, but I have a manual transmission. I would advise a Procal to adjust for tire size and shift points.
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Old 03-13-2014, 07:29 AM   #4
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I have the 3.6 manual with 3.73's and 285/70/17 at's. It was a little different at first from pushing the stock 16's, but I got used to it. I can easily cruise at 70 mph in 6th gear at around 2500-2800rpms. I would definitely advise a superhips flashcal or aev procal to fix the shift point issue. Leaving it like that could premature the life of the tranny. Northridge4x4.com had the best price I have found. I know this isn't exactly what you asked for, but two out of four isn't bad.
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Old 03-13-2014, 08:25 AM   #5
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Rebeloffroad.com has procals for $160
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Old 03-13-2014, 10:33 AM   #6
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Quote:
Originally Posted by TexasUT View Post
Rebeloffroad.com has procals for $160
Northridge4x4 is selling the Flashcal for 143.99
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Old 03-13-2014, 02:36 PM   #7
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I'm running 285/70/17's on a 14' Unlimited auto with 3.73's and I have a Superchip Flashpaq running the 87 octane tune. 70mph is around 2300-2400 rpms. It's drives ok and is very responsive, but it does downshift a lot on overpasses and with almost any amount of wind. I want to regear if that helps make up your mind.

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