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Unread 06-04-2011, 09:52 PM   #1
lincolnmatthews
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1987 YJ Wrangler 
 
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ONE MORE TIME PLEASE! tiresize/axle ratio??

I know this has been covered a million times, but wanted to check with you guys, so many knowledgeable guys here! I have an 87 that is getting a BDS 2" lift going with 31" tires. I am thinking about going with a 3.73 gears is this going to be ok with my tires?, or should I go with 4.10's?. I thought with my stock axles that I couldn"t go with more than 3.73's?. Then I want to go with some kind of a front locker only, I know the about the axle limitations with these years. What would you guys recommend?, am I right in putting a locker up front?. I should note I have the manual trans with the 6 banger! Which locker is more trouble free? I dont think I want air or electric, how about the one that uses the cable style?? Sorry about all the questions, maybe this will finally put this issue to rest? Thanks for any help

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Unread 06-04-2011, 09:55 PM   #2
TheNewbie
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Regearign is expensive. It wold be cheaper to find some 4.10 axles from a 4 banger YJ with the AX5.
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Unread 06-05-2011, 12:12 AM   #3
Michaelgoesrawr
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You shouldn't need to re gear with those. I'm on 30's and I'm fine. And you're right about the locker in the front.
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Unread 06-05-2011, 03:50 AM   #4
92XJT
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Quote:
Originally Posted by TheNewbie View Post
Regearign is expensive. It wold be cheaper to find some 4.10 axles from a 4 banger YJ with the AX5.
I would go this route as well if you wanted lower gears. I picked up a set for $100 on ebay a few years back.
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Unread 06-05-2011, 07:59 AM   #5
linusb
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I ran 32's with 3.07's and it was fine...sluggish...but fine.
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Unread 06-05-2011, 08:10 AM   #6
Noltz
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You're asking the right questions, so no apologies needed

1) You've got 3.07's in a 4.2/Manual combo. I drove mine with 33's and it was okay, although 5th gear was only good above 60mph and cool weather (no joke). If you're going to swap axles, get the 4.10's. You can live with a few more RPM's on the highway for the better ratios for around town. The 4.2 is a bit of a dog with it's amazing 120hp so you want to keep it geared high anyway.

2) Lockers are completely a personal decision. Auto 'lunchbox' lockers are reasonably priced and with the vacuum disconnect you won't suffer on the street. I've not seen a cable-type locker. Are you thinking about the cable disconnnect systems (also called "posi-lock")? These aren't lockers, they're cable driven replacements for the trouble-prone vacuum disconnect system. ARB is an air locker, and I've seen electric lockers too (can't think of name).

Swapping a D35 back into your Jeep is very simple, but you're missing an opertunity to get a much stronger axle for just a little more money. Search for "Ford 8.8 YJ swap"... there's hundreds of examples. The Ford 8.8 can be found in 3.55, 3.73 and 4.10 ratios, and many came with limited slip diffs, factory! Not as good as a true locker but way better than open and easier on the street! It's not a bolt-in, but read about it and make your own decisions.

Personally, I've found a D30 with 4.10's for my front, and will get a disc-brake equipped, Ford 8.8 shortly with 4.10's too. This is for my 4L Auto YJ running 35" tires.

EDIT; I just realized I didn't mention I had a 4.0 head swap too. I did not drive it with the stock head as it was cracked, a 4.0 swap was a no brainer.
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Unread 06-05-2011, 02:42 PM   #7
Michaelgoesrawr
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Quote:
Originally Posted by Noltz
You're asking the right questions, so no apologies needed

1) You've got 3.07's in a 4.2/Manual combo. I drove mine with 33's and it was okay, although 5th gear was only good above 60mph and cool weather (no joke). If you're going to swap axles, get the 4.10's. You can live with a few more RPM's on the highway for the better ratios for around town. The 4.2 is a bit of a dog with it's amazing 120hp so you want to keep it geared high anyway.

2) Lockers are completely a personal decision. Auto 'lunchbox' lockers are reasonably priced and with the vacuum disconnect you won't suffer on the street. I've not seen a cable-type locker. Are you thinking about the cable disconnnect systems (also called "posi-lock")? These aren't lockers, they're cable driven replacements for the trouble-prone vacuum disconnect system. ARB is an air locker, and I've seen electric lockers too (can't think of name).

Swapping a D35 back into your Jeep is very simple, but you're missing an opertunity to get a much stronger axle for just a little more money. Search for "Ford 8.8 YJ swap"... there's hundreds of examples. The Ford 8.8 can be found in 3.55, 3.73 and 4.10 ratios, and many came with limited slip diffs, factory! Not as good as a true locker but way better than open and easier on the street! It's not a bolt-in, but read about it and make your own decisions.

Personally, I've found a D30 with 4.10's for my front, and will get a disc-brake equipped, Ford 8.8 shortly with 4.10's too. This is for my 4L Auto YJ running 35" tires.

EDIT; I just realized I didn't mention I had a 4.0 head swap too. I did not drive it with the stock head as it was cracked, a 4.0 swap was a no brainer.
Ox lockers are cable actuated.

The 4.10's would be good. And if you've got the extra cash and can weld then get the 8.8.
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