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post #1 of 10 Old 06-06-2002, 10:45 PM Thread Starter
hollywood
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Is anyone running 4:10's with 33's behind a T-5/258? Can you still do 50-55 mph at a reasonable rpm? I need to replace my 2:73's and I'm looking for advice. This is not my daily driver - it sees more dirt than street, but I'd still like it to be drivalble on the longer rides to the trail heads. Thanks


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post #2 of 10 Old 06-06-2002, 10:48 PM
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</font><blockquote><font size="1" face="Verdana, Arial">quote:</font><hr /><font size="2" face="Verdana, Arial">Originally posted by hollywood:
<strong>Is anyone running 4:10's with 33's behind a T-5/258? Can you still do 50-55 mph at a reasonable rpm? I need to replace my 2:73's and I'm looking for advice. This is not my daily driver - it sees more dirt than street, but I'd still like it to be drivalble on the longer rides to the trail heads. Thanks</strong></font><hr /></blockquote><font size="2" face="Verdana, Arial">I'm running 4.56's with 33's and an NV4500 - turn 2500 rpm @70 mph. This is with an AMC 360 engine.

Steve

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post #3 of 10 Old 06-07-2002, 09:33 AM
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</font><blockquote><font size="1" face="Verdana, Arial">quote:</font><hr /><font size="2" face="Verdana, Arial">Originally posted by hollywood:
<strong>Is anyone running 4:10's with 33's behind a T-5/258? Can you still do 50-55 mph at a reasonable rpm? I need to replace my 2:73's and I'm looking for advice. This is not my daily driver - it sees more dirt than street, but I'd still like it to be drivalble on the longer rides to the trail heads. Thanks</strong></font><hr /></blockquote><font size="2" face="Verdana, Arial">LOL, if it weren't for the stupid CAFE standards back then, I'm sure we would have never seen those useless 2.73's in any CJ axles

What a useless ratio for a Jeep! Anyway, I may be looking to upgrade also in the future. My '77 CJ7 below in sig, has 3.54s and I will be running 33s soon and have a 1972 AMC 360 in it.
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post #4 of 10 Old 06-09-2002, 08:38 PM
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this a newbie question probably, but how do i tell what gear ratio i have? count the teeth and do a proportion calculation, or what? thanks

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post #5 of 10 Old 06-09-2002, 09:37 PM
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</font><blockquote><font size="1" face="Verdana, Arial">quote:</font><hr /><font size="2" face="Verdana, Arial">Originally posted by KG4PAM:
<strong>this a newbie question probably, but how do i tell what gear ratio i have? count the teeth and do a proportion calculation, or what? thanks</strong></font><hr /></blockquote><font size="2" face="Verdana, Arial">Rotate your tire exacly one turn while counting the revolutions of the pinion - in my case for every tire rotation the pinion turns about 4.5 times since my ratio is 4.56:1

Steve

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post #6 of 10 Old 06-10-2002, 01:42 AM
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If you do the turn method to figure the gear size you have to have both rear tires turn so if lockered or posi will work if not will need a friend to help and has to be out of gear. That way gets you in the ball park the other way is count teeth on ring gear and divide by number of teeth on pinion gear to get actualy size.

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post #7 of 10 Old 06-11-2002, 12:52 PM
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</font><blockquote><font size="1" face="Verdana, Arial">quote:</font><hr /><font size="2" face="Verdana, Arial">Originally posted by cj7traildriver:
<strong>If you do the turn method to figure the gear size you have to have both rear tires turn so if lockered or posi will work if not will need a friend to help and has to be out of gear. That way gets you in the ball park the other way is count teeth on ring gear and divide by number of teeth on pinion gear to get actualy size.</strong></font><hr /></blockquote><font size="2" face="Verdana, Arial">What he said. If you have an "open differential" (not locked or posi), when you rotate one wheel, the other will turn opposite. You have to rotate the other side the same or do it rolling the vehicle in neutral on the ground (both wheels rotating the same).
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post #8 of 10 Old 06-11-2002, 03:23 PM
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Try these two links for info on axles.
<a href="http://www.off-road.com/jeep/tech/axle/" target="_blank">More axle stuff</a>

<a href="http://www.off-road.com/jeep/swb/articles/specgrid.htm" target="_blank">Axle stuff</a>

Just read the tag on the front axle; it should tell you. The AMC 20 is a little more tricky because it uses a code. I believe mine says B on it and that is a 3.31 ratio.

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post #9 of 10 Old 06-11-2002, 08:05 PM
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All the stuff I've read says that with 33's and T5/258 us 4.10 gears for best all around power.

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post #10 of 10 Old 06-11-2002, 11:21 PM Thread Starter
hollywood
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Thanks Jeep Daddy, that's all I wanted to hear.

For everyone else:

On a wide track Dana 20 -
D = 2.73
B = 3.31
A = 3.54
H = 3.73
C = 4.10

Any double letter, such as "DD" means Trac-lok with that letter's ratio. This will be stamped on the flat area to the right of the diff cover.

- Jeff
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