2005 TJ with 285/75/16, 4.56 or 4.10 and A/T - JeepForum.com
 
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post #1 of 13 Old 11-01-2011, 08:46 AM Thread Starter
ckalogris
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2005 TJ with 285/75/16, 4.56 or 4.10 and A/T

Does anyone have this setup? Can you tell me the rpm you get at 60mph, with the OD? Any pics?

Thanks!

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post #2 of 13 Old 11-01-2011, 09:53 AM
Wheelin98TJ
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MPH x Gear Ratio x 336 x OD ratio
--------------------------------- = RPM
Tire size


Or you can plug the #s in here:

http://www.csgnetwork.com/multirpmcalc.html


4 speed OD ratio = 0.69 (round up to 0.70 for drivetrain loss)
285/75/16 = 32.8" tall (round down to 32.4" since actual tire height is often less than calculated height)
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post #3 of 13 Old 11-01-2011, 09:58 AM
Mortalis5509
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4.88

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post #4 of 13 Old 11-01-2011, 10:07 AM
touched
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05 Rubicon with A/T,4.10 gears, 285\75\16 MTR's,60 mph is about 1800rpm.
Attached Thumbnails
savvy6.jpg  

Rokmen TT,Savvy GTS, JKS BL MML,Orr-Fab sport Cage,Rock Hard front bumper,Body Armor side bars,Best rear bumper
Currie HD Steering , Savvy 4" lift, Fox shocks
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post #5 of 13 Old 11-02-2011, 06:28 AM Thread Starter
ckalogris
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thanks Wheelin98TJ! very useful formula and comments
Mortalis5509, do you suggest to go with 4.88?
touched, what lift do you have?
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post #6 of 13 Old 11-02-2011, 06:31 AM Thread Starter
ckalogris
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also, touched, did you need wheel-spacers? is there any rubbin?
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post #7 of 13 Old 11-02-2011, 08:08 AM
touched
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Quote:
Originally Posted by ckalogris View Post
also, touched, did you need wheel-spacers? is there any rubbin?
Savvy 3" lift, I didnt use spacers,had some rubbing in the front at full lock. I just put a few washers behind the stops.

Rokmen TT,Savvy GTS, JKS BL MML,Orr-Fab sport Cage,Rock Hard front bumper,Body Armor side bars,Best rear bumper
Currie HD Steering , Savvy 4" lift, Fox shocks
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post #8 of 13 Old 11-03-2011, 01:17 AM
Mortalis5509
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Quote:
Originally Posted by ckalogris View Post
thanks Wheelin98TJ! very useful formula and comments
Mortalis5509, do you suggest to go with 4.88?
touched, what lift do you have?
Everyone told me 4.88 with the 42rle. I have had them in for six months and could tell a difference from my 4.10's. I drive a Rubi also. I just ordered 315 75 16 and going to run 4.88 and see how that does. It recommend 5.13 for that size. Hey the deeper you go the better performance off road.

By brother drove my jeep with the 4.88's and 285 75 16 and said it moved easily. The overdrive in the transmissions can lug the jeep without gearing right causing you to burn more gas.

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post #9 of 13 Old 11-03-2011, 02:20 AM Thread Starter
ckalogris
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thanks for the tips. I have also been told that I should go with 4.56, since 4.88 is to small and may break under pressure... Someone else told me that this is true and 4.88 is more possible to break, but A/T is more "kind" to the gears and transmission than M/T (where 4.88 usually smashes). What do you think? Did you have any problem? Did you have to upgrade anything else, so as to avoid breaking?
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post #10 of 13 Old 11-03-2011, 06:19 AM
Wheelin98TJ
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4.88 is not weaker, at least not enough to make a difference.

The ring and pinion is not the weak point.

If the ring and pinion fails, its setup error or a faulty gear set.
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post #11 of 13 Old 11-03-2011, 09:57 AM
Mortalis5509
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Agree above me. Run 4.88.

Go DAWGS
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post #12 of 13 Old 11-03-2011, 10:01 AM
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I have this setup with 4.10 gears but not sure the exact RPM at 60mph, Ill check next time Im on the highway.

Check out my build if you want to see pics

Follow me on Instagram @ Tarantula_TJ


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post #13 of 13 Old 11-03-2011, 10:15 PM
Mortalis5509
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Quote:
Originally Posted by AngryTJ View Post
I have this setup with 4.10 gears but not sure the exact RPM at 60mph, Ill check next time Im on the highway.

Check out my build if you want to see pics
Your rpm's will be different than his because you have a manual and he has a auto.

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