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SUVs Jeep Liberty and Jeep Liberty Diesel Jeep Liberty Diesel
10671 messages, Last post on Nov 10, 2009 at 6:56 PM
You are in the Jeep Liberty and Jeep Liberty Diesel Forum. Your Hosts are steve_ & tidester
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Replying to: tnilc99 (May 02, 2009 12:09 am) a bit to allow 75 mph to be achieved at 2000 rpm that would be ideal. Tnilc99, you can get 74 mph at 2,000 rpm by changing to 225/85/16 tires. Taller tires will go through deep snow and mud a little better - given the same tread. Others have done this but I don't recommend it because it adversely affects handling a little (your want to drive faster) and makes the torque converter issue worse. As far as changing the gear ratio you would have to change ring gear and pinion in both the front and rear differentials. This is not cheap to do and you would still have the torque converter problem. Also, going with taller gears reduces you towing capacity a little. I don't think you have that much to gain here. I get a dependable 29.5 mpg on the highway at 1,900 rpm and 66 mph (summer fuel). What's the difference what part of the torque convert fails? Lets tell it like it is. The CRD has a very good tough little transmission and torque converter (better with the recall) that stands up to the torque of the Hemi V8 but not the impulse torque of this nasty little VM diesel. Even the upgraded SunCoast converters are not holding up for some people. Here's the way I look at it. If I stomp the pedal off the line my rear tires get cremated. If I hit the throttle just right a 54 mph and 1,700 rpm I can get the converter to judder (slip) at 1,800 rpm. My solution is to not do either one, for now. |
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Replying to: caribou1 (May 06, 2009 6:22 am) transmission manuel helped to gain the understanding as to whats going on during a function cycle of the converter. Now I can draw a mental picture as to whats happening internally. You know the old saying a picture is worth a thousand words. Guess I need to order the Jeep liberty cd manuel and I will now. I have to say this forum and the other one lost jeeps has allowed me to this point to fix every issue I have had over the last 3 years. Its nice not to have to depend on the stealership to get results. If you happen to run across that Thesis you mentioned, it sure would be nice if you would post its web address. Thanks again Tnilc99 |
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Replying to: tnilc99 (May 02, 2009 7:32 pm) I have see a small automatic unit that might work, it is usually used on larger trucks but it might fit. http://www.gearvendors.com/index.html
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Replying to: mdamick (May 07, 2009 10:49 am) I had one on a GM that used the rotation of the transmission shaft to produce it's own hydraulic pressure. Then a 12V solenoid let the fluid push a wedge clutch that engaged the overdrive. As the car would come to a stop, the clutch came back into 1:1 ratio. The question is: how fast does this gearbox shift when you are in an emergency braking situation and when the ABS comes into action?
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Replying to: caribou1 (May 07, 2009 12:44 pm) It looks like the one you described, possibly the same manufacturer. |
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Replying to: mdamick (May 07, 2009 10:49 am) just the edge Im looking for. Tnilc99 |
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This is what the dealer said from a service bulletin. Apparently the diode in the clutch assy is defective causing the PCM to fail. My 55Kmi CRD just died on the road with many engine codes. First they blamed that I ran out of fuel (with 1/4 left) then they said it was blowing fuses and was a bad harness. Now, after they spent 4 billable hours, they say its a bad PCM due to the bad diode. The good news is the PCM is under the 8/80 warranty. The bad news is that the labor and parts to replace the ac clutch is 1291 plus tax. Does this sound right or?........ Thanks
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Replying to: desmo750ss (May 19, 2009 1:58 pm) The diode is used to block the spike caused by the shutting off of power to the coil that runs the clutch. That spike could cause all sorts of things to happen in the PCM. I think $1300 for the A/C clutch is high, for that they must be replacing the whole compressor. The parts manual does not show the clutch as a separate part. If you have an 8/80 warranty, why doesn't it also cover the A/C? |
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Replying to: mdamick (May 20, 2009 10:37 am) Hans |
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