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post #1 of (permalink) Old 01-04-2001, 11:36 AM
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Which Gear Ratio?

I have a 76CJ5 304 T-150 D20 with Model 20 rear (1piece axles), Model 30 front. Currently have 3.54 gears with 33in tires. Some day I plan on finding a T-18 for it

I want to change my ratio to just a little better than what came stock. I just wanted to hear from someone that might have the same type set up and found the best overall ratio. I have been thinking 4.10 but wanted to ask before I experiment.Do I have to change carriers going into the 4.?? ratios compared to my 3.54

Because I take trips of 170 miles round trip monthly to put in my military time, I need to run the highway at 65 mph or I will get run over.

Any help would be appreciative. Also anyone have a good set of gears, for a good price let me know.

76 CJ5 304 "its a JEEP thing, I hope you understand"
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post #2 of (permalink) Old 01-04-2001, 11:52 AM
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Re: Which Gear Ratio?

I switched to 4.11s in my Jeep. It's a very similar set-up to yours. It travels very well on the highway. I asked the same question when I was considering the gears for mine. Some people will recommend the 4.56, but I don't think these are long distance drivers. 4.11s are perfect.

You will have to swap carriers for the upgrade.

DREW
IN2DEEP <font color=red>78 CJ5</font color=red> <font color=blue>302 FORD </font color=blue> [img]/wwwthreads_images/icons/shocked.gif[/img] <font color=red> T176/D300 REAR ARB 35" BFGS </font color=red>
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post #3 of (permalink) Old 01-04-2001, 12:55 PM
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Re: Which Gear Ratio?

If its a 3.54 you shouldn't have to change the carrier if going to 4.10's. I bought a limited slip with 3.54 gears and changed to 4.10's and it worked perfect. Hope this helps, later.

Bird

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post #4 of (permalink) Old 01-04-2001, 01:59 PM
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Re: Which Gear Ratio?

The carrier break on the M30 is 3.73. So 3.73 and lower gears will work on one carrier, and 3.54 and higher will work with the other, so you will need another carrier to run 4.10 gears in the M30. The AMC 20 is all set though, no new carrier needed.

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post #5 of (permalink) Old 01-04-2001, 02:43 PM
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Re: Which Gear Ratio?

OK... I just double checked my 4wd Hardware catalog. They are correct. The front will need a new carrier, the rear won't. I guess since I added an ARB when I did my gear swap I really didn't pay attention to the rear carrier. Either that, or my melon is going bad..... NAH, that can't be it.

I stand corrected.

DREW
IN2DEEP <font color=red>78 CJ5</font color=red> <font color=blue>302 FORD </font color=blue> [img]/wwwthreads_images/icons/shocked.gif[/img] <font color=red> T176/D300 REAR ARB 35" BFGS </font color=red>
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post #6 of (permalink) Old 01-04-2001, 05:32 PM
 
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Re: Which Gear Ratio?

I probably thought about this topic for WEEKS before I made my decision. It's a big amount of money to invest so you wanna make sure you choose wisely.
Here's what I did. I figured it backwards using some gear ratio calculator. http://dirtroad.com/gears.htm. http://www.4lo.com/gearratio.htm is another decent one.
If 65 is as fast as you want to drive, and you have a V8, 33's and 3 speed, just pick a RPM you want to cruise at. For instance, 3.73 give you 2468 RPM's at 65, 4.10's give you 2713 RPM's at 60 MPH. 4.56's would give you 3017 RPM's at 65 MPH. Play around and see what's comfortable..
Bob in MA

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