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Old December 10th, 2007, 08:47 PM   #1
wiron
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Default 94 YJ W 35s slows down up hills.

Have 94 yj w/ 2.5 and 35s. stock gears, would like to change gears so so i can use 5th gear and have better power off road, i think it may run cooler as well ?
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Old December 11th, 2007, 12:33 AM   #2
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What is your question?
I don't think it will make much/any difference as far as running cooler.
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Old December 11th, 2007, 07:12 AM   #3
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If you are still running the stock axles IE 30 front 35 rear the tallest gears available are 4:88's. Even if they offered taller I don't think I would go taller with those axles due to the pinion gear size. I run 4:88's in mine with the 2.5 and 35" tires and can cruise in 5th gear at 70 on the highway as long as there is little or no head wind. I also do have to down shift on hills. As for running cooler my jeep has always run in the 200 to 210 range if you can believe the factory temp gauge. I did replace the cooling fan with an electric one to free up some power. Hope this helps.
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Old December 11th, 2007, 11:20 AM   #4
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Best place to buy the 488 gears, are they hard to change, thanks
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Old December 11th, 2007, 11:44 AM   #5
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What is your question?
I don't think it will make much/any difference as far as running cooler.
Higher gears like that with big tires and a tiny engine will increase load, and will increase operating temperature.
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Old December 11th, 2007, 11:56 AM   #6
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why dont you just swap the axels out for a 44 40 combo those axels arent realy good with 35s on them
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Old December 11th, 2007, 12:23 PM   #7
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Higher gears like that with big tires and a tiny engine will increase load, and will increase operating temperature.

4:88s should reduce the load, still don't think it would help the temp issue.
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Old December 11th, 2007, 02:48 PM   #8
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Iam planning on a header and custom exhaust, and a 3 core radiator to,
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Old December 11th, 2007, 07:41 PM   #9
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Best place to buy the 488 gears, are they hard to change, thanks
If you are asking that question, you won't be doing it yourself. With parts & labor, it can easily become a $1000 expense and is a waste of money to do now if you think you'll want traction devices in the future.

If you are growing out of your Jeep (which it sounds like you may be starting to), you may want to consider selling it and starting with a better platform like a 4.0 drivetrain and an non-D35 rear axle.
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Old December 11th, 2007, 09:59 PM   #10
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Just downshift.

Your final drive ratio is what matters- it doesn't make any difference how you achieve that on the highway as far as engine load is concerned. Lower gears in the axle and using overdrive, or stock gears and using the 1:1 ration in the trans. The key is to keep your engine in its powerband.
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Old December 11th, 2007, 10:47 PM   #11
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I'm running a '94 YJ with 32x11.5 BFG MTs and stock gearing with a 2.5L Going uphill or into a stiff headwind at 70 mph can be...a slowing experience. But cruising along it is fine in 5th gear. Then again, the engine has been modified about as much as a 2.5L can be. And when I put that engine in I made sure that the entire coolant system was new...as well as the sensors (protect that investment). New radiator, water pump, hoses, temp sensors. It has a 160 degree thermostat in it and it runs 160 degrees. BUT...I do proper maintenance on my coolant system EVERY year. Like draining and refilling with 50/50 mix of coolant and using de-ionized water (not tap water). Scale has a definate effect on coolant temps. My old engine with was really scaled up when I yanked it (I bought it used so that mess wasn't my fault). If your coolant system is in good condition you will have no problem with high temps. (which can lead to more problems).

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Old December 12th, 2007, 01:12 PM   #12
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i would really not recommend running 35's on a d35 rear end. the torque alone required to push a 35 will take it's toll on that axle. find a 8.8 and swap it in.
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Old December 13th, 2007, 01:57 PM   #13
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i would really not recommend running 35's on a d35 rear end. the torque alone required to push a 35 will take it's toll on that axle. find a 8.8 and swap it in.
and you have broken how many 35's?
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Old December 13th, 2007, 08:29 PM   #14
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I guess I am lucky to have not broke any, altho I did damage the yoke and stock drive shaft, thay offer 2 u-joints for that year and it takes the larger of the two, What makes this a not so good axle. My son and I have got this thing down to the frame almost ready to paint it, just picked up all new brakes and lines today I guess I should list it in rug builds, we dont off road to hard, so we are going for looks with some goodies, thanks for all the info,
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Old December 13th, 2007, 08:35 PM   #15
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Quote:
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i would really not recommend running 35's on a d35 rear end. the torque alone required to push a 35 will take it's toll on that axle. find a 8.8 and swap it in.
poppycock
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Old December 13th, 2007, 10:13 PM   #16
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poppycock
x2 run what you brung budget wheeling at its finest
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Old December 13th, 2007, 10:23 PM   #17
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x2 run what you brung budget wheeling at its finest
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Old December 13th, 2007, 10:39 PM   #18
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McLovin!!! Nice!
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Old December 15th, 2007, 06:20 AM   #19
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I am on my second Jeep with a D35 and 35's. Sure you can break them, but if you know how how control the throttle, and not go banzai coming out of a mud hole you can make them live just fine.
If it breaks, upgrade.
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