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Unread 06-29-2013, 11:11 AM   #1
Razorback23
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1995 YJ Wrangler 
 
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Location: Fort Smith, Arkansas
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Do I need to regear?

I local guy is wanting to trade his 33 BFGs for my 31 Mastercrafts. I have a 2.5 lift on my YJ. I drive the interstate everyday cruising around 60-65 with around 1600rpm. Im really wanting to upgrade to these tires but i want to know what I'm getting myself into before I commit. My jeep is just a weekend warrior and i dont do any crawling. Just trails and the occasional mud hole. Below are my specs for the jeep. Do i really need to regear?

1995 Jeep Wrangler YJ
6 Cylinder
5 Speed Standard
*Stock Driveline*
2.5 RC Lift
31/10.50/R15 Mastercraft MT

Wanting to upgrade to BFG 33/12.50/R15

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Unread 06-29-2013, 11:57 AM   #2
NHfireLJ
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You'll lose some on the high way and into 4th gear a lot more, especially on hills, most likely. assuming you have 3.07 gearing.. but take a look at your diffs and see what you have..
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Unread 06-29-2013, 12:23 PM   #3
Anticanman
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Do you need to regear? No. Personally there are bigger things to spend your money on than regearing at this point. At a fraction of the cost you can buy axles out of a 4 cylinder. Manual is 4.10 and ideal but the auto gearing is still a drastic improvement over your stock gearing. If you feel the need to take it offroad a lot then look into a replacement ford explorer rear axle that also comes in the 3.54, 3.73 and 4.10 gears. Its a straightforward swap with some pinion and brake adjustment and a driveline adapter.

Just a thought.
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Unread 06-29-2013, 12:30 PM   #4
Razorback23
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Quote:
Originally Posted by Anticanman View Post
Do you need to regear? No. Personally there are bigger things to spend your money on than regearing at this point. At a fraction of the cost you can buy axles out of a 4 cylinder. Manual is 4.10 and ideal but the auto gearing is still a drastic improvement over your stock gearing. If you feel the need to take it offroad a lot then look into a replacement ford explorer rear axle that also comes in the 3.54, 3.73 and 4.10 gears. Its a straightforward swap with some pinion and brake adjustment and a driveline adapter.

Just a thought.
So would I be good without it? I mean, my stock axles can hold up the 33s? I don't wheel it hard even when i go off road.
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Unread 06-29-2013, 01:24 PM   #5
Anticanman
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Every jeep is different. I busted a rear axle with 31's on the street.
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Unread 06-29-2013, 02:43 PM   #6
Tom95YJ
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Quote:
Originally Posted by Anticanman View Post
Every jeep is different. I busted a rear axle with 31's on the street.
I broke a D35 with 33's behind a 4banger. Hit a patch of ice then dry pavement . Snapped both shafts and cracked the carrier all in one shot
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Unread 06-29-2013, 03:13 PM   #7
kgb_m3
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I just upgraded from 31s to 33s KM2s two days ago. 3 speed auto here with 3.55s It gets me to work and back, completely drivable and goes 70mph no problem on the interstate. With 3.07s it'll still get you places and you're going to want to regear that much sooner. Go with new axles, people ask more $$ to regear than to rebuild an engine these days.

I grabbed an 8.8 with 4.10s from a junk yard, still looking for a d30 of a 4 banger with 4.11s. That'll be perfect with auto and 33s. Even with manual and 33s it'll work great. Your 5th will only be used on flats and 4th up hills.

As far as d35 goes, I've seen people wheel on 35s and beat on it then drive home.
Buddy beating on his YJ d35/35s:



I'm taking my chances as well with 33s next weekend. If I blow it up, 8.8 goes in that much sooner.
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Unread 06-30-2013, 08:48 AM   #8
TrailRated2011
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Gear Ratio Guide for Larger Tires

@Razorback23

Here's a couple of information sources that may help you in your decision making.

Gear Ratio Guide for Larger Tires
http://www.quadratec.com/jeep_knowle...article-26.htm

Gear Ratio Calculator
http://www.manoian.net/jeep/gear_ratio_calculator.html
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Know your angles before approaching obstacles and
follow the general rule of off-roading, "Go as slow as you can, as fast as you must."
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