'93 4.0 manual. Gear swap 3.07 to 3.55

Dano · Jan 30, 2004

I just got a 93XJ. I plan on throwing on a budget moost and 31's that I have left over from my '99. I also have my '99's 3.55 geared 8¼ axle. I was wondering how much of a gain with the maual I would recieve by going to a junk yard and picking up a dana 30 axle geared at 3.55 and swapping that in.

other reason wouls be to kep the 3.07 axle's shafts and hubs. and I would trash the housing.
Would it be worth it to swap in another axle and have spare shafts and hubs and be running 3.55 gears?

ChuckD · Jan 30, 2004

It would definitely help. 3.55 and 31's mathmatically would put you dead even as if you were stock with OEM tires. I know the extra weight and air resistance, but they are only 31's and a budget boost.

Also do not just throw away the D30, you should be able to get at least $150-200 for it. For I know it's a Non-disco. I would just try to find another housing that's 3.55. Maybe find a guy here at NAXJA

who is gearing from 3.55 and just swap with them. Unless your planning an gearing to at least 4.10 or lower I wouldn't waste money on new gears and such.

ChiXJeff · Jan 30, 2004

I ran 31x10.50s on 3.07s for a couple of months with a 5spd. It sucked. Bad.

I geared up to 4.10s and added limited slips. You've hit on just about the cheapest way to get some gear back, by swapping in already built axles.

Kejtar · Jan 30, 2004

ChiXJeff said:
I ran 31x10.50s on 3.07s for a couple of months with a 5spd. It sucked. Bad.

I geared up to 4.10s and added limited slips. You've hit on just about the cheapest way to get some gear back, by swapping in already built axles.

Kind of a hijack

Jeff, what do you have now? I though I saw something bigger then 31's under you XJ, and if so, which gears you got now and how do you like them with the bigger tires?

ChiXJeff · Jan 30, 2004

Kejtar said:
Kind of a hijack Jeff, what do you have now? I though I saw something bigger then 31's under you XJ, and if so, which gears you got now and how do you like them with the bigger tires?

<grin> I put 33x12.50s on in September, with 4.10 gears. 4.10s with 33s are a little low. Good on the highway, not so good offroad. </grin>

I roached a rear end r&p set (long story, it started with a bad pinion yoke.) Got 4.56s now!

ChiXJeff

Kejtar · Jan 30, 2004

How do you like the 4.56?? Would you rather have went with 4.88's or maybe 4:1 in the tcase?

ChiXJeff · Jan 30, 2004

Kejtar said:
How do you like the 4.56?? Would you rather have went with 4.88's or maybe 4:1 in the tcase?

Kind of hard to put 4.88s in a Chrysler 8.25......the 4.56s are treating me pretty well.

I suspect that a 4:1 in the tcase would be nice. I'm thinking that the next driveline mods are going to be a D44 rear, a flipped D300 and a Klune crawler box. Lots of gear choices, then.

ChiXJeff

OILBURNER · Jan 30, 2004

Back on Topic....

Currently running 3.55's in the wifey's XJ with 31's. It is very driveable, although 3.73's would be perfect - that's what I am going to run in my MJ

Dano · Jan 30, 2004

cool guys thanks for (some of) the replys.
I found out I can pick up a '95 D30 axle for $175. My price range was 150-200.
I may be looking into giving my axle housing away to a buddy who may have a bent housing and is regearing soon. unless I can sell it. :farmer:

FELIX · Jan 31, 2004

Don't wast your time w/ the 4:55's your 5 gear is way too tall. Go 4:11's or better. I'm running 32 11.5's w/ 4:11's & it works pretty good. I would like a little more pull though, but not @ the price of a tiny Dana 30 pinion. I run @ 2100 Rpm @ 65Mph. I orignally changed to 3:73's, & relized how much 5th gear I had :doh: . luckily, I had only had the rear changed.

$.02 deposited

Rob

Dano · Jan 31, 2004

talked to buddy and set a price for my housing for $75. better than ditching it!
looks like I'll have a 93 daily driver fixed for under $1000 :bunny:

'99 XJ hybrid 4.5" lift / 93XJ DD in progress / '85 XJ fixer upper
`webshots` Midwest Jeepthing Club

ChiXJeff · Jan 31, 2004

FELIX said:
Don't wast your time w/ the 4:55's your 5 gear is way too tall. Go 4:11's or better. I'm running 32 11.5's w/ 4:11's & it works pretty good. I would like a little more pull though, but not @ the price of a tiny Dana 30 pinion. I run @ 2100 Rpm @ 65Mph. I orignally changed to 3:73's, & relized how much 5th gear I had :doh: . luckily, I had only had the rear changed.

$.02 deposited

Rob

I assume you mean 3.55s, not 4.55s.....

On a side note, it sounds like he's trying to do this on a budget, and can do 3.55s for $175. 4.10s or better will cost him at least a few hundred just in gears, and not counting setup cost either.

FELIX · Feb 3, 2004

ChiXJeff said:
I assume you mean 3.55s, not 4.55s.....

On a side note, it sounds like he's trying to do this on a budget, and can do 3.55s for $175. 4.10s or better will cost him at least a few hundred just in gears, and not counting setup cost either.

Oops, I did mean 3:55's. He could look for a 4 banger, w/ 4:11's if going the Junk yard route. I just know for me, w/ 4:11's I could use just a little more gear, w/out it affecting daily driveability. I just figure for the trouble of changing, it wouldn't be worth it, especially, if he is paying to have them set up.

Rob

Dano · Feb 8, 2004

well It's done. Man what a Job 3days after work and 2 full days. I still have other issues before I get it lisenced and need to soak the rear shackle bolts a while before they will come loose to put the extended shackles on. I am running 30" retreads on black stock steelies for now. :bunny:
My buddy keeps my nondisco axle to set up with ARB and I got spare steering set up.

'93 4.0 manual. Gear swap 3.07 to 3.55

Dano

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ChuckD

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ChiXJeff

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Kejtar

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ChiXJeff

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Kejtar

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ChiXJeff

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OILBURNER

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Dano

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FELIX

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Dano

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ChiXJeff

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FELIX

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Dano

NAXJA Member #1269

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