Axles and gears questions. - JeepForum.com
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post #1 of 18 Old 10-22-2021, 08:27 PM Thread Starter
leagleagle
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Axles and gears questions.

I have an 85 cj7 with a 350, t5, dana 30 and amc 20. 33" tires and pretty heavy forged aluminum wheels.

I need lower gears. I've weighed and priced my options and have decided to keep the stock axles and do the one piece kit on the 20.

I'm going to go from 3.31 to a lower gear, probably 4.10 or 4.11. I don't do any extreme offloading and for the foreseeable future it is on road 85% of the time. I think the axles will be fine unless I decide to do more offloading.

So...my question is gear brands. What do I want, what do I want to stay away from. Same question on the one piece kit. Aside from Moser are there any other recommendations or is that the one?

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post #2 of 18 Old 10-23-2021, 01:26 AM
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Originally Posted by leagleagle View Post
I have an 85 cj7 with a 350, t5, dana 30 and amc 20. 33" tires and pretty heavy forged aluminum wheels.

I need lower gears. I've weighed and priced my options and have decided to keep the stock axles and do the one piece kit on the 20.

I'm going to go from 3.31 to a lower gear, probably 4.10 or 4.11. I don't do any extreme offloading and for the foreseeable future it is on road 85% of the time. I think the axles will be fine unless I decide to do more offloading.

So...my question is gear brands. What do I want, what do I want to stay away from. Same question on the one piece kit. Aside from Moser are there any other recommendations or is that the one?
Quite a whie back I setup Yukon gears in my friend's YJ. They patterned very nicely and are running nice and quiet to this day, about 50,000 miles later. Not sure if current Yukon gears are the same quality.
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post #3 of 18 Old 10-23-2021, 01:59 AM
agear
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I just put a yukon ring and pinion set in my dana 44. They don't whine. And less than 10 years ago they were considered 1 of the best . Like 80 cj said I don't know where they stand now but to my knowledge dana or yukon are the way to go. My Moser 1 piece axles came with a 10 year warranty and my superior 1 piece axles I had in another amc 20 came with a 5 year warranty and I did some wheeling in the mild parts of uwharrie national Forrest.with those .
So if I was in the market I would get dana or yukon and superior or moser
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1984 jeep cj7, 258 I6, rebuilt T176,rebuilt Dana 300, amc 20 , dana 30, 4.10's Trac-lok in rear , 4.10's detroit soft locker in dana 30, 2.5 inch bds suspension lift, 1 inch polyurethan body mount lift. Line ex. weber carburetor. factory tach. factory clock ,oem replacement speedomter cluster, and oil pressure gauge, factory volt gauge.
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post #4 of 18 Old 10-23-2021, 06:32 AM
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I like what Yukon offers as well. Nice setup and installation kits come with everything you need.
I have Superior Gears that I purchased in 2008 when they were still being made in the good ole' US of A. Don't know where they are being made now though.


I wouldn't think you would need 4.10 gears with a 350 Chevy engine and 33" tires. 3.73's would be my choice but having a T5 behind a V8 engine, 4.10's might buy you some time before the T5 gives out from the excessive torque. The AMC/Jeep version of the T4/5 was not designed to be behind a V8 engine.
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post #5 of 18 Old 10-23-2021, 09:51 AM Thread Starter
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I like what Yukon offers as well. Nice setup and installation kits come with everything you need.
I have Superior Gears that I purchased in 2008 when they were still being made in the good ole' US of A. Don't know where they are being made now though.


I wouldn't think you would need 4.10 gears with a 350 Chevy engine and 33" tires. 3.73's would be my choice but having a T5 behind a V8 engine, 4.10's might buy you some time before the T5 gives out from the excessive torque. The AMC/Jeep version of the T4/5 was not designed to be behind a V8 engine.
I'm totally on board that the transmission needs an upgrade. That is high on the list as well. Been looking just haven't decided
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post #6 of 18 Old 10-23-2021, 01:51 PM
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I forgot to mention that in my own CJ-5, I installed Dana gears in the D30 front axle and Precision gear in the rear AMC 20. Dana gears are still available but I understand that Precision sold out. Dana gears are always good gears and set up nicely.
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post #7 of 18 Old 10-24-2021, 07:49 AM
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I'm curious, why do you want lower gears if you are not doing hardcore off-roading? a 350 in a CJ doesn't need a 410 for street driving and the 410 will decrease your MPG and put more wear and tear on your engine.
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post #8 of 18 Old 10-24-2021, 09:45 AM Thread Starter
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I'm curious, why do you want lower gears if you are not doing hardcore off-roading? a 350 in a CJ doesn't need a 410 for street driving and the 410 will decrease your MPG and put more wear and tear on your engine.
I don't drive it daily so don't really care what the gas mileage does. I want to regear it because it is super sluggish. 4th gear really boggs down on inclines even at 55-60 mph and 5th gear might as well not exist.
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post #9 of 18 Old 10-24-2021, 09:50 AM
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Don't forget there are used gear sets out there as well. We used to install them regularly and they were much less expensive than new sets. This especially holds true for the front, which rarely gets used at all. All of our sets were Dana out of stock housings and as long as the pattern/backlash was good were dropped on the shelf for resale. You could cast around and see if major suppliers (Toms bronco parts, Herm, etc..) are selling sets.

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post #10 of 18 Old 10-24-2021, 08:24 PM
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Don't forget there are used gear sets out there as well. We used to install them regularly and they were much less expensive than new sets. This especially holds true for the front, which rarely gets used at all. All of our sets were Dana out of stock housings and as long as the pattern/backlash was good were dropped on the shelf for resale. You could cast around and see if major suppliers (Toms bronco parts, Herm, etc..) are selling sets.
That would be a low cost option if you can find the right ratio. OEM Dana 30 gears would be Dana and probably with low actual four wheel drive mileage. When I swapped my OEM 3.54's for 4.10's,they probably had less than 2000 miles of actual 4WD use on them. I would check for matching numbers.
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post #11 of 18 Old 10-26-2021, 06:51 PM
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Yukon, you can't beat them for the price! Also if you ever think you are going to go to 35's go ahead and throw 4:56's in there and be done with it. You'll also need new carriers for 4:11 so its a good time to throw some detroits in there, if you don't want to go full locker, for when you do catch the offroad bug.
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post #12 of 18 Old 10-26-2021, 07:10 PM
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I have Yukon gears in my axles too. 4.56:1
Do any of y'all have 4.56 gears with 35" tires and drive on the interstate ?

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post #13 of 18 Old 10-26-2021, 08:37 PM
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Ditto on the gear ratio. I have a 350, turbo350 automatic Dana 20 and my stock 3:73 work fine. I can burn up the 32" tires if I dump on, yet, it's not screaming on the highway

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post #14 of 18 Old 10-26-2021, 09:06 PM
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As I mentioned in your other thread…decide on the transmission, which at this point I would keep as is, then focus on your gear ratio. Do you want overdrive or not, do want more strength or does it matter to you…the heart of everything your trying to do, gears, axles, drivability, still starts with the transmission.
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post #15 of 18 Old 10-27-2021, 09:43 AM
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Originally Posted by 1980tallcj7 View Post
I have Yukon gears in my axles too. 4.56:1
Do any of y'all have 4.56 gears with 35" tires and drive on the interstate ?
I have 4:56 and 35's and drive on the freeway. Running a built 401 and t-176 upgraded tranny. Wish I had a fifth gear to play with as my engine has a lot more to give in the top range, but I max out in fourth. Plenty of passing power though.

Mines a bit of a unicorn though as I have WAY more power than I can possibly access in an offroad rig that is streetable.

My best offroading buddy runs a stock 4.2l with 35's and 4:56's but he has a 5 speed and runs down the highway jsut fine. However going up the steep grades in the colorado mountains on I-70, he has to drop his rig down in to third to maintain any sort of speed. around town, even with his lack of horsepower, but with a fifth gear, he'll outrun my rig on the highway all day long.
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