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  #1  
Old 01-31-2014, 08:54 AM
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Regearing?

It's been a few weeks since I've posted anything and I was looking around this morning at some WK's with lifts and the 4.7L with 3.73 gear ratio. I have a 3.7L with 3.07 gears in the rear. If I want to do a 2.5 inch lift with 265/70/17 Trail Grappler's, would it be a bad choice to regear when I lift? Or would that kill my MPG's? I'm averaging 13.3 now that I have my Rola on top. I know if I did regear, it wouldn't increase power, it'd be an increase in torque. But would it be significant enough to where I would notice it? And can I even regear the 3.7L from 3.07 to 3.73 gears?
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Old 01-31-2014, 10:28 AM
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Re: Regearing?

Yes it will be a significant boost in performance. But you will take a hit on mpgs because the engine will be turning more rpms then before. I am about to purchase the parts needed for a regear on my rwd 3.7. Im going up to a 3.73 ratio and upgrading to a lsd. You will be turning 3-500 more rpms at 60mph but you will boost acceleration by a few tens to almost a second. ..

EDIT: you will need a dealer to recalibrate the tcm, otherwise the transmission will go into limp mode
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Old 01-31-2014, 10:44 AM
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Re: Regearing?

Quote:
Originally Posted by Strongjeff View Post
Yes it will be a significant boost in performance. But you will take a hit on mpgs because the engine will be turning more rpms then before. I am about to purchase the parts needed for a regear on my rwd 3.7. Im going up to a 3.73 ratio and upgrading to a lsd. You will be turning 3-500 more rpms at 60mph but you will boost acceleration by a few tens to almost a second. ..

EDIT: you will need a dealer to recalibrate the tcm, otherwise the transmission will go into limp mode
Can you give me a list of the parts I will need to regear a 4x4 3.7L?
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Old 01-31-2014, 10:46 AM
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Re: Regearing?

Quote:
Originally Posted by Strongjeff View Post
Yes it will be a significant boost in performance. But you will take a hit on mpgs because the engine will be turning more rpms then before. I am about to purchase the parts needed for a regear on my rwd 3.7. Im going up to a 3.73 ratio and upgrading to a lsd. You will be turning 3-500 more rpms at 60mph but you will boost acceleration by a few tens to almost a second. ..

EDIT: you will need a dealer to recalibrate the tcm, otherwise the transmission will go into limp mode
Will the regearing benefit me if I go to a bigger tire?
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Old 01-31-2014, 10:53 AM
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Quote:
Originally Posted by GC10LTD View Post

Will the regearing benefit me if I go to a bigger tire?
Yes. It allows the engine to better put the power down. Ill have to do some research on it, but I have links for the rear end in my build thread...
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Old 01-31-2014, 10:58 AM
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Re: Regearing?

Quote:
Originally Posted by Strongjeff View Post
Yes. It allows the engine to better put the power down. Ill have to do some research on it, but I have links for the rear end in my build thread...
Do I need to do the front and rear to a 3.73 or just a rear?
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Old 01-31-2014, 11:02 AM
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Quote:
Originally Posted by GC10LTD View Post

Do I need to do the front and rear to a 3.73 or just a rear?
Front and rear otherwise you'll destroy the transfer case
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Old 01-31-2014, 11:17 AM
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Heres a link to front gears but they dont have 3.73 on the site. They do have 3.90 and its easy to get a rear set that matches... ill keep looking but I need to get some sleep. It is 0116am here

http://www.4wheelparts.com/Drivetrai...hrysler+7.25in.
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Old 02-01-2014, 10:43 AM
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