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Fulltimer
 Post subject: Gear Ratio 02 KJ
PostPosted: Tue Jun 26, 2007 5:58 pm 
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What is the rear end ratio for 4Lo in 1st gear. With a V-6

Terry

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tjkj2002
 Post subject: Re: Gear Ratio 02 KJ
PostPosted: Tue Jun 26, 2007 7:03 pm 
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Fulltimer wrote:
What is the rear end ratio for 4Lo in 1st gear. With a V-6

Terry
The rear end ratio is 3.73 for auto trannies(V-6).The t-case adds another 2.72:1 reduction in 4lo.
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KY Liberty
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PostPosted: Tue Jun 26, 2007 7:08 pm 
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With the '02, 3.7 automatic, with the 45RFE transmission, NV242 or NV231 transfer case, and 3.73 gears, the final drive ratio is 11.19:1 in high range, and 30.32 in low range. Mine, with 4.10's is at 12.30:1 in high range, and 33.33:1 in low range. With the 42RLE transmission and 3.73's it 10.59:1 high range, and 28.71:1 low range. With 4.10's, 11.64:1 high, and 31.56 low.

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Last edited by KY Liberty on Tue Jun 26, 2007 7:14 pm, edited 1 time in total.

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Fulltimer
 Post subject: Re: Gear Ratio 02 KJ
PostPosted: Tue Jun 26, 2007 7:09 pm 
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tjkj2002 wrote:
Fulltimer wrote:
What is the rear end ratio for 4Lo in 1st gear. With a V-6
r
Terry
The rear end ratio is 3.73 for auto trannies(V-6).The t-case adds another 2.72:1 reduction in 4lo.


Is that for the 02? I have an 05 now but I used to have the 02. It seems that the 02 was a lot lower than my 05.

Terry

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Jeepjeepster
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PostPosted: Tue Jun 26, 2007 7:12 pm 
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The tranny had a lower 1st gear in the 02.. rear diff and tcase is the same.

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tjkj2002
 Post subject: Re: Gear Ratio 02 KJ
PostPosted: Tue Jun 26, 2007 7:13 pm 
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Fulltimer wrote:
tjkj2002 wrote:
Fulltimer wrote:
What is the rear end ratio for 4Lo in 1st gear. With a V-6
r
Terry
The rear end ratio is 3.73 for auto trannies(V-6).The t-case adds another 2.72:1 reduction in 4lo.


Is that for the 02? I have an 05 now but I used to have the 02. It seems that the 02 was a lot lower than my 05.

Terry
That's because the '02 KJ's have the 45RFE which has a 3:1 1st gear ratio,the '03+ KJ's with the 42RLE tranny has a 2.84:1 1st gear ratio.Also the 45RFE has a 3:1 reverse,42RLE has a 2.21:1 reverse,45RFE has a 0.75:1 O/D,and the 42RLE has a 0.69:1 O/D ratio.
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Fulltimer
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PostPosted: Wed Jun 27, 2007 5:09 am 
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Thanks guys. That clears it up! I like the 02 set up better.

Terry

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KY Liberty
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PostPosted: Wed Jun 27, 2007 12:53 pm 
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Fulltimer wrote:
Thanks guys. That clears it up! I like the 02 set up better.

Terry


I like the '02 setup better too. Just wish it had the 2nd overdrive ratio of .67 like the 545RFE for the interstate.

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Fulltimer
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PostPosted: Wed Jun 27, 2007 12:59 pm 
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Would switching the tranny work or would the computer have fits?

Terry

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tjkj2002
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PostPosted: Wed Jun 27, 2007 1:14 pm 
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Fulltimer wrote:
Would switching the tranny work or would the computer have fits?

Terry
Well the 45RFE has a seperate TCM unlike the 42RLE has the TCM intergrated into the PCM,so yes the PCM would have a fit.
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