Gear ratios and bad advice

billiebob

TJ Expert
Oct 31, 2015
3,164
Kootenays, BC, Canada
6-speed manual NSG370
33's - 4.10 more street, 4.56 more trail or mountainous/hilly highway
I drive 24K miles every year, mostly pulling a trailer in the mountains. With 33s and 4.10s. I wish I had 3.73. All too often I will be on a long steady downhill wishing I had one more gear.... or 3.73s That is real world experience, anyone else here put 24K miles on every year, towing a 2000 pound trailer for most of those miles? ... in the mountains?

75251
 
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AndyG

TJ Addict
Supporting Member
Jul 30, 2018
1,544
Alabama
All the math people use kills me ...and I have seen some real keyboard battles over gearing and octane ......I know it satisfies the mind ...but you can pretty much ask experienced owners like Jerry Bransford , Rob or Chris and end up fine .

Tire sizes vary, they actually become smaller every time you drive the Jeep , and if you get in the ball park you will be fine .

Most folks want to figure it all out ...it's when you first drive the regeared Jeep that you really smile .
 
Reactions: JMT

Steven

New Member
Jun 19, 2018
24
Ontario
Sorry, a little bit off topic here, but recently found a good deal on a D30/D35 with 4.88 gears. However the rear is disassembled and has a welded diff. If I were to make the buy, and take the ring and pinion off and just use the carrier that is currently on my jeep (also a D35) would that hypothetically work? I checked the teeth on the gear and pinion and everything looks great, and the asking price was below the cost of the gear sets themselves.

To put into perspective, I'm currently running 33's on the stock 2.5L with 4.10 gearing and having to sit in 4th around 3050 rpm at roughly 110km/h (roughly 70mph). I would like to upgrade the rear axle in the future, but for the time being I'm just doing light Overlanding so I have no desire to run anything over 33's, or get lockers for now as it is the D35.

Question being - would it be worth grabbing the axles and putting the two rears together?

Again, sorry for being a little off topic. Just looking for some advice before doing anything I regret.
 
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JMT

The Jeep Guy
Supporting Member
Ride of the Month Winner
All the math people use kills me ...and I have seen some real keyboard battles over gearing and octane ......I know it satisfies the mind ...but you can pretty much ask experienced owners like Jerry Bransford , Rob or Chris and end up fine .

Tire sizes vary, they actually become smaller every time you drive the Jeep , and if you get in the ball park you will be fine .

Most folks want to figure it all out ...it's when you first drive the regeared Jeep that you really smile .
I should get to drive mine for the first time today. :)
 
Reactions: derekmac