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Unread 07-12-2007, 04:22 PM   #211
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Quote:
Originally Posted by Thunderstrike
Will JK be equipped with Goodyear Wrangler MT/R tires in the future?
We do not discuss future stuff

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Unread 07-12-2007, 04:22 PM   #212
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Quote:
Originally Posted by HolidayJeep
You guys are great for taking the time to do this, and Jeep is the best brand of any product ever in history!

I'd like to hear your thoughts on engine oil - conventional or full synthetic, both for late-model / low mileage and for older, high mileage vehicles.

Also, is it safe to run a lower temp. thermostat, say 180, on a 4.0L?
As far as oil - this is really up to personal choice and what type of intended usage the vehicle will see....just remember that our oil change interval doesn't change with synthetic, it's the same as with conventional oil. Age really isn't a factor, though I have seen cases of older engines with high mileage leak after putting in synthetic...mostly an issue with oil compatibility and seal compounds. Most modern engines use RTV or other synthetic rubber seals and this isn't really an issue anymore.

As far as running the 180 thermostat - DON'T! The engine computer is calibrated around the stock thermostat. In all likelihhood the system won't go into closed loop...not a good thing!
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Unread 07-12-2007, 04:24 PM   #213
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Quote:
Originally Posted by JeepEngineers
The knuckles, tubes, and suspension brackets are just adaptation pieces to attach the axle to the vehicle. The part that makes it a 44 or a 30 or whatever is the parts that carry torque. The TJ Rubicon has the larger model 44 gear set and larger splined shafts and stonger U-joints at the wheel ends. The JK Rubicon got similar imporvments with the Model 44 (this time we got the high pinion) and 30 spline shafts and stronger U-joints (this time they got bigger and not just a material change).
So is the rear D44 that was an option on the TJ Sport the exact same as in the TJ Rubicon (larger gear set, shafts, and u-joint, as you said above)?

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Unread 07-12-2007, 04:26 PM   #214
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Quote:
Originally Posted by Slapahoe
Heres a semi good questions for you.

I own a '93 YJ. 4.0 HO model, Auto trans, after market there after.

I bought this jeep stock. It had just gotten a engine & trans rebuild, and was just put backtogether after it had been endoed and layed on it's back for almost 6 hours.

So at start up, the engine made a HORRIBLE knocking sound when it started cold. It would taper down, and still be heard but very lightly. At acceleration, you could not hear it over the engine, but while traveling at a constant speed, and letting off the gas lightly, the knocking sound came back just as loud.

After having a non-jeep mechanic say perhaps it could be a loose rocker that needed to be checked or re torqued.

Anyways, I had that done and nothing was wrong with them.

Talking to another mechanic, he said that this noise could be coming from the transmission. He mentioned a certain part, but I couldnt remember it for the life of me now.

Any suggestions on what this could be?
If the Jeep is upside down all of the oil goes to the valve covers. If put back on its wheels then started right away, the oil pump can loose its prime. If that happens it's a good chance you could have damaged the crank bearings. Does it still have good oil pressure? You might want to check the bearings.
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Unread 07-12-2007, 04:26 PM   #215
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Quote:
Originally Posted by JeepEngineers
Noted... HD cooling. Tough one here when aftermarket stuff blocks off airflow. We test in way extreme conditions like Death Valley at 125 F with no overheating.

Keep in mind, adding stuff under the hood affect cooling too as the air has to flow somewhere.

Extra doors.. not at this time. Not a bad suggestion
I think Rubicon should come with ram air duct (as in European cars having ram air ducted to brake rotors to help keep them cool). Rubicon should anticipate the front being equipped with a winch and additional lights, so ram air duct should be made available.

For me temp is Ok in low speed driving, but it runs hot at highway speed, so if more air can be redirected to radiator it would help maintain the normal temp.

Test next year model with a biggest winch mounted on front bumper in extended highway speed driving with AC on.
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Unread 07-12-2007, 04:26 PM   #216
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Quote:
Originally Posted by grogie
So is the rear D44 that was an option on the TJ Sport the exact same as in the TJ Rubicon (larger gear set, shafts, and u-joint, as you said above)?


Yes, Execpt for the u-joint no joint shaft joints on the rear.
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Unread 07-12-2007, 04:27 PM   #217
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Quote:
Originally Posted by nycaubrun
did i see in one of the last 14 pages that you can get the ellectronic sway discos from mopar also? sorry if i am trippin. Also love the new JK I have an 2006 rubi and its almost sold to get the 4 dr rubi, if your production could speed up a little
No you were not tripping! Mopar offers a kit to add the electronic sway bar to be added to vehicles build without. The vehicle on board computer must be reprogramed (at your dealer ) to make the unit operate.

Thanks for the your question. The Mopar part number is 82210218

happy Jeepin!
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Unread 07-12-2007, 04:27 PM   #218
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With the sale of the Chrysler group, has there been any types of noticable changes to your work, as in, has the new ownership made any kind of changes in the Jeep franchise?
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Unread 07-12-2007, 04:30 PM   #219
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Quote:
Originally Posted by PM Thor
With the sale of the Chrysler group, has there been any types of noticable changes to your work, as in, has the new ownership made any kind of changes in the Jeep franchise?

Business as usual.
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Unread 07-12-2007, 04:30 PM   #220
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Quote:
Originally Posted by mytjjeep
Thanks for the great product and your time. Just some of my questions for the 07 JK.....

1. Any benefit or harm to 5w-30 over the recommended 5w-20?
2. Would you suggest an additional trans cooler for the auto and offroading?
3. Would 4:88 rearend really hurt mph in a 2dr auto
1. You may see a slight mileage hit with the thicker oil. We of course can only recommend the oil that we tested and developed the vehicle for.
2. We tested automatics in severe conditions (Moab) with the stock cooler. Be careful with an add on cooler as you can run a transmission too cool - especially in the winter. Most of our vehicles that have an aux cooler option have a thermostatic valve to keep the cooler "out of the loop" until the trans temp comes up.
3. Depends on your driving habits/usage - really hard to predict. At a steady state on the highway, mileage would most likely suffer.
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Unread 07-12-2007, 04:30 PM   #221
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What application should I specify to get the best oil seals for my '91 4.0? It's currently leaking, andd I've heard about rubber valve cover seals and one piece oil pan and rear main seals used in later models. What would be the best compatible seals to use?
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Unread 07-12-2007, 04:31 PM   #222
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Quote:
Originally Posted by scottlaroc
While driving im hearing rattling sounds coming from the drivers side interior.The noise seems common among new Jeep owners.It seems its coming from where the seatbelt extension between the front and rear door.Thanks again

It's hard to know with out looking at it but have your dealer look the seat belt mechanism.
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Unread 07-12-2007, 04:33 PM   #223
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I saw you guys and the prototype vehicles in Moab this spring and just want to say thanks for attending events like that and bringing the toys along.

Now get to work on that diesel option - gimme gimme
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Unread 07-12-2007, 04:33 PM   #224
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Any way to get better CAD data for development work than the dumbed down polygonal data available to SEMA members?
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Unread 07-12-2007, 04:34 PM   #225
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[QUOTE=pamo]I think it got missed...

Other than adjusting your steering wheel, trac bar, and your toe in, is there any thing else that needs to be done alignment wise to the front end of a tj after installing a lift?[/QUOTES

Balance tires the best you can and make sure you leave the pinion angle alone.
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