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Unread 07-10-2013, 02:41 PM   #1
Colt44
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Ordered 3.73 but got 3.54 - keep, or return?

I have a 1983 CJ-7, straight-six 258 with an automatic, AMC 20 rear end and running 31" tires.

My Jeep is driven mostly on the road, with a few excursions into light off-roading during hunting season and at a few other times.

I wanted to re-gear from 2.73 and ordered 3.73 (that selection was based on opinions from this forum and elsewhere), but due to an error I received a 3.54 ring & pinion instead.

The question: Is the 3.54 close enough, or should I go to the trouble and expense of returning it and getting the 3.73 as originally intended?

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Unread 07-10-2013, 03:19 PM   #2
JustDandee
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I think if you step back, that you are asking the same question again. Which is the best gear 3:54 or 3:73? If you made your decision already, feel comfortable with it and get the gear ratio you really want. We would all with just inject another round of opinions to filter through

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Unread 07-10-2013, 03:34 PM   #3
jp360cj
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Carrier split for the Dana 30 is 3.54/3.73.. Do you have a 3.73 carrier? If not you'll need one.
not a lot of difference between the two, but if you ever go up to 33s the 3.73 perform better
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Unread 07-10-2013, 03:44 PM   #4
Always2L8
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There is a 5% difference between 3.54 and 3.73 gears (3.54/3.73 = 0.95). If you planned on 2000 rpm @ X mph with the 3.73, then you will be doing .95*2000 @ X mph with the 3.54. Only about about 100 rpm less. Not that big a difference IMO. If you keep the 3.54's you don't need a new carrier in the D30. The AMC20 is a wash as you need a new carrier.

Good Luck
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Unread 07-10-2013, 03:47 PM   #5
Tigerjeep79
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I'm running 32" tires and am happy with the 3:50 gearing I've got (9" Ford diff won't go 3:54). At 65 MPH on the highway, the 258 spins at 2500 RPM. I don't really want to rev it higher than that for long stretches, and with 3:73 gearing it would certainly have to rev higher.
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Unread 07-10-2013, 03:49 PM   #6
Balvar24
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If you wanted 3.73, why not get 3.73?
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Unread 07-10-2013, 04:09 PM   #7
robs7
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If you yourself decided on 3.73 then send your 3.54's back and get the right ones. Don't let someone else's mistake dictate your decision. Send them back. Been there, done that, and regretted it. Not with axles though. Just my two cents. Rob
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Unread 07-10-2013, 04:18 PM   #8
Redmanchew
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hey I have a set of 3.54's with only about 60,000 on them ... no broken teeth etc.... if you want shoot me a PM and lets talk...
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To reiterate for the 1,067th time, when towing...
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Unread 07-10-2013, 05:18 PM   #9
Colt44
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Quote:
Originally Posted by Always2L8 View Post
There is a 5% difference between 3.54 and 3.73 gears (3.54/3.73 = 0.95). If you planned on 2000 rpm @ X mph with the 3.73, then you will be doing .95*2000 @ X mph with the 3.54. Only about about 100 rpm less. Not that big a difference IMO. If you keep the 3.54's you don't need a new carrier in the D30. The AMC20 is a wash as you need a new carrier.

Good Luck
To recap from the first go-round, there's nothing hard and fast about the 3.73 gearing, and I was anything but dead-set on that particular ratio. Really, it's more a matter of getting away from the 2.73 now that I've got the 31" tires. I can't really see myself going to 33" because this is essentially a daily driver and I'm not going to be loading it up with performance parts. Really, the 3.73 was almost an arbitrary compromise between what I have and things that start with a 4.

However, I missed that I'd need a new carrier for the Dana 30 up front if I go with the 3.73 - if the 3.54 is that close and won't need a carrier change-out then it would seem to make sense to go with the 3.54 and move on.
(I already have a new carrier for the AMC 20, BTW.)
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Unread 07-10-2013, 07:12 PM   #10
Jeeper44mag
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Personally, I think the 3.54 is a better choice if you are going to spend most of your time on the road.

Luis
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Unread 07-10-2013, 07:25 PM   #11
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I second that for 31's, Id go 3.54. but that's just me
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1975 CJ-6 304 T15 Dana20 30/44 3.73
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Unread 07-10-2013, 10:36 PM   #12
fourbtgait
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I have 3.54's, 31" tires, T5 tranny.

Yes, it runs good on the highway, easily does 65-70 if I want, average 15 mpg at 60 mph.
I would rather have 3.73, but since 3.54 is so close, it's not worth changing out.
If I had a lower ratio like you, I would go 3.73. But whats your tranny? Overdrive helps a lot for me.

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Unread 07-11-2013, 01:53 AM   #13
80cj
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I ran 31's with 3.54's in my 80 CJ-5 with T-176. It was an excellent combination.
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Unread 07-11-2013, 08:50 AM   #14
Colt44
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Quote:
Originally Posted by fourbtgait View Post
I have 3.54's, 31" tires, T5 tranny.

Yes, it runs good on the highway, easily does 65-70 if I want, average 15 mpg at 60 mph.
I would rather have 3.73, but since 3.54 is so close, it's not worth changing out.
If I had a lower ratio like you, I would go 3.73. But whats your tranny? Overdrive helps a lot for me.

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Re-read the first post - Mine's an automatic.
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Unread 07-11-2013, 09:07 AM   #15
WindKnot
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I also run 3.54 with 31s, but it's YOUR Jeep! Just make sure the axle ratios MATCH!
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