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Old 10-11-2011, 04:04 PM   #1
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2.73 gears

Just found out the 84 Scrambler I am working on for my parents has 2.73 gears in it. 6 cyl 4spd with the Dana 300 T-case.
Going to be running 31x10.5x15 tires. Thoughts on these gears doing light to moderate off wheeling?

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Old 10-11-2011, 04:13 PM   #2
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you mean 3.73 gearing and you can offroad on any gearing. 31's and 3.73's is good.

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Old 10-11-2011, 04:35 PM   #3
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you mean 3.73 gearing and you can offroad on any gearing. 31's and 3.73's is good.
x2 im running 3.73 gears aswell with 33s and it still has plenty of power.
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Old 10-11-2011, 04:49 PM   #4
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Nope, I pulled the covers, has 2.73's in it
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Old 10-11-2011, 05:15 PM   #5
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I'd highly recommend a regear. If you are going to run 31's and do some offroading but not hardcore I'd say 3.73 would be good.

If going to 33's I'd say 4.10 or 4.56.

Since it is only a 4spd you will not notice the power loss as much going to bigger tires.
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Old 10-11-2011, 06:01 PM   #6
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Nope, I pulled the covers, has 2.73's in it
What kinda jeep do you have??? Ive never heard of a jeep running 2.73 gears.
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Old 10-11-2011, 06:02 PM   #7
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84 Scrambler. I thought it was crazy as hell that there were 2.73 in it. But I checked the tag on the front and pulled both covers to verify and it is indeed 2.73 gears.
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Old 10-11-2011, 08:35 PM   #8
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Another question, if we go with different gears, what size can we go to before we have to change the carrier?
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Old 10-11-2011, 10:03 PM   #9
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Another question, if we go with different gears, what size can we go to before we have to change the carrier?
I don't think Dana 30s have a carrier break. I think the amc 20 is 3.54 but may be 3.73. I get confused with the Dana 44.
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Old 10-15-2011, 05:55 PM   #10
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My 86 CJ7 came with 2:73 gears Yes Jeep did had those crappy gears.
Now I have 3:73's. The model 20 rearend's not that good I'd swap in a
Scout dana 44 rear. just have to cut and reweld the spring pads.
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Old 12-01-2011, 03:47 PM   #11
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Dana 30 carriers break at 3.54's
Model 20's break at 2.72 gears.
2.72 gears are common in CJ's
So are 3.31's and 3.54's.

lets do the math!
these are all calculated using 33" tires

A early CJ with 5.38 gears, T90/spicer 18 transfercase is 31.58 crawl & 205ft per min

A 72-75 CJ with 3.73 gears, t15/D20 is 22.72 crawl and 285 ft per min

A mid 70's CJ with 3.54 gears, t5/D20 is 25.15 crawl and 258 ft per min

A 80's CJ with 2.72 gears, T176/ D300 is 27.12 crawl and 239 ft per min.

Its not all abbout the gears in the diffs. The further ahead in the drivetrain! the bigger change it will be!
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Old 12-03-2011, 05:22 PM   #12
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My 86 CJ7 came with 2:73 gears Yes Jeep did had those crappy gears.
A CJ factory 86 Dana 44 rear!
It had a T176 and Dana 300.
Now it has a T18 ,Scout Dana 300 and 3:73 gears in both the front and rear Dana 44's.
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Old 12-04-2011, 09:23 AM   #13
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I took out my 2.73 gears. Put in 3.54 gears with 33" tires and have had no problems. I do some moderate wheeling (not into crawling, just exploring the vast unpaved world).
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Old 12-04-2011, 12:42 PM   #14
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Well we decided to go with 4.10. Limited slip in rear, open in front.
Took my 88 YJ up to Ruidoso NM Thanksgiving weekend. My YJ has 3.07 gears with 31" tall tires and it was horrible on the mountain roads going to and from the trails. Once on the trails no problem but the hwy driving sucked.
Dad told me he is so happy I talked him into going with the gear swap since his Scrambler will spend more time in the mountains than it will on the plains of West Texas.
And an update on tires size. We decided to go with at 3 1/2" lift and 33x12.5x15 tires.


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Old 12-04-2011, 01:54 PM   #15
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Looks great!

It has turned out awesome! Glad to see a scrambler made into a jeep not a show piece.

As you know I love my 4.10's as well.
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Old 12-04-2011, 02:14 PM   #16
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Looks great!

It has turned out awesome! Glad to see a scrambler made into a jeep not a show piece.

As you know I love my 4.10's as well.

Funny you mention this. Before I even started on it I told dad that I will do everything he wants to it as long as he does not take it to a body shop and make the body perfect. He asked me why and I told him that if he did that, then he would look at it as an investment instead of what it is meant to be, and that is an off road vehicle.
He agreed and everything below the body has been painted, ryno'd, replaced, inspected, rebuilt and or fixed.

After the trail riding we did over Thanksgiving weekend in my 88 YJ, I dont think he will be doing anything to the body for a long time

Here we are lowing the body back over the chassis for the last time.
Should have it running and driving by mid week. Get the gears and exhaust installed next Monday.

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Old 12-05-2011, 09:08 AM   #17
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4.10's are perfect in my opinion for a rig you want to trail ride and still have highway driveability. With 4.10's and your 33's you should be around 2500 rpm @60mph. This keeps you well within your rpm's for power.
The 4.10's and 33's, T176 trany and D300 gives you a crawl ratio of 37.67 and you will be doing 172 feet per min @ 750rpm.
The physically strongest gear sets are the 3.73 and 4.10 ratio's! better on the drivetrain and less stress on axles!

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