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Ring and pinion gear question for CRD GUYS
http://www.lostjeeps.com/forum/phpBB3/viewtopic.php?f=5&t=42554		 Page 1 of 1
Author:  CRD Joe [ Fri Apr 24, 2009 12:01 pm ]
Post subject:  Ring and pinion gear question for CRD GUYS
Trying to figure out gears for my tires. I want 235/85/16 (31.7" tall)
Do you think 4.56 gears would be too tall? Stock gears and tires give rpm of: 2006rpm at 70mph. 4.11 gears and 235 tires give: 70mph = 2056rpm
4.56 gears and 235 tires give 70mph = 2281 rpm.

For the CRD guys is that to much rpm at 70 mph?????
Author:  tommudd [ Fri Apr 24, 2009 12:31 pm ]
Post subject: 
So you're going solid front axle in your CRD? Cool
Author:  CRD Joe [ Fri Apr 24, 2009 12:35 pm ]
Post subject: 
You're being a wise guy, I think. No I wasn't planning on it.
Author:  tommudd [ Fri Apr 24, 2009 12:47 pm ]
Post subject: 
CRD Joe wrote:
You're being a wise guy, I think. No I wasn't planning on it.


No not being a wise guy but that would be the only way to run 4.56 gears in a CRD Liberty so thought you were heading that way , sorry :oops:
Author:  CRD Joe [ Fri Apr 24, 2009 1:05 pm ]
Post subject: 
No offense meant. Why is that the only way to run those gears? Ifs or not isn't a dana 30 a Dana 30?
Author:  tommudd [ Fri Apr 24, 2009 1:20 pm ]
Post subject: 
CRD Joe wrote:
No offense meant. Why is that the only way to run those gears? Ifs or not isn't a dana 30 a Dana 30?


not quite, its a Dana 30 A which makes it just a little different so 4.10s are it, the lowest they go, now the new Liberty KKs can go deeper due to some design changes but the KJs not so lucky or there would be way more running around with lower gears than 4.10s ...sucks doesn't it!

Tom
Author:  bugnout [ Fri Apr 24, 2009 3:54 pm ]
Post subject: 
The front diff in the 2008+ will take standard Dana 30 gears, but the gears for the D30A in the 2002-2007 are unique to this diff. They only were made by Dana Spicer and they only made three versions, 3:55 3:73 and 4:10
Author:  ATXKJ [ Sat Apr 25, 2009 12:25 am ]
Post subject: 
The CRD engine will spin all day at 2300 rpm - did that on I10 (80mph)
but you'll get 15mpg doing it.
Author:  Allen M. [ Sat Apr 25, 2009 9:05 am ]
Post subject: 
From Salt Lake City to Helena, Montana. 521 miles I ususally travel at 85mph (2400 rpm) Last Night the lying EVIC said 29mpg but it will calculate out to about 24mpg.

i have taken the libby off road a few times not rock crawing but i have found that it has plenty of power. I was actually looking for a wrecked v6 5sp and get the gears out of it as i think that those came with the 3.42 ratio.
Author:  CATCRD [ Sun Apr 26, 2009 10:21 pm ]
Post subject:  Re: Ring and pinion gear question for CRD GUYS
CRD Joe wrote:
Trying to figure out gears for my tires. I want 235/85/16 (31.7" tall)
Do you think 4.56 gears would be too tall? Stock gears and tires give rpm of: 2006rpm at 70mph. 4.11 gears and 235 tires give: 70mph = 2056rpm
4.56 gears and 235 tires give 70mph = 2281 rpm.

For the CRD guys is that to much rpm at 70 mph?????


You don't need to regear when you have a CRD. :lol: You can't fit big enough tires under the KJ body to make your CRD a dog. Just get a tuner and it will make up for any perceived power loss.
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