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Old 10-25-2015, 09:34 PM
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Post 2001 Jeep Grand Cherokee transmission

I have the original transmission, (never completely rebuilt) with 376,000 miles on my Jeep Cherokee limited 4.7L, but now have transmission problems. I did the valve body upgrade (Transgo shift kit), and my shifting has improved greatly, with only occasionally downshifting/upshifting on very steep mountain roads ... which did not improve with upgrade.

Before the upgrade coming to a stop would nearly run into car in front of me, and upon high speed passing of other vehicle I would experience a terrible shifting ,,, but none of these problems exist now after the Transgo kit was installed ... all is good, except for mountains, and grinding sound.

However, now I have a "start-up" problem only with a growling sound, and with bouncing on road dips the sound increases, then reduces ... and this will eventually go away with the warming of the engine, and of course the transmission.

I have been told that the Torque converter is the problem, and oil pump ... Does this type problem get worse, and may cause major damage, if not quickly fixed, ... or what?

I have a QuadraDrive NV247, 4x4 5 gear, Veri-Lock front and rear differentials.

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Old 10-25-2015, 10:03 PM
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Re: 2001 Jeep Grand Cherokee transmission

Welcome to the garage.
Many times, shifting problems are caused by the TPS or the speed sensors, even without having a fault code. Did you install the transgo shiftkit?
Quite some miles on your jeep, is this still with the original transmission?
Not sure if your problem is the torque converter or the oil pump. Does the sound appear when idling and the jeep stopped? When you listen under the jeep, can you hear where the noise is coming from?
Difficult to say if damage can be expected, without knowing exactly what is causing the noise. If the noise is caused by wear, it probably will get worse over time. How does the transmission fluid look like? Fresh fluid is light red in color, but can become more brownish over time. Very dark color or burned smell to the fluid is ofcourse not good.

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  #3  
Old 10-25-2015, 10:33 PM
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Re: 2001 Jeep Grand Cherokee transmission

Yes it is the Transgo shift kit. And it is the original transmission, but also has a complete rebuild of the engine, new valves, valve seats, increased size piston/rings, etc. and now with this engine rebuild I have 125,000 miles, with new front cv joints.

New front hubs/bearings, rotors, and new style calipers, new rotors/pads, and complete rebuild of all front struts, etc.

This grinding noise is present while idling, in neutral, or in drive, thus it is not the differentials nor transfer case ... not moving.

Because this grinding problem eventually silences while driving, slow or on highway speeds, will this give me some hope that this will last without severe further damage, if I continue to drive until I can find time to fix this?

Thank you very much for your reply.

Just what is the best educated guess, ... but totally my responsibility, of course.
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Old 10-25-2015, 10:43 PM
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Re: 2001 Jeep Grand Cherokee transmission

So did you have a look at the transmission fluid? A grinding noise is normally not a good sign, especially when it comes from the transmission. Can be a needle bearing going bad, or one of the planetary gears. What sometimes also happens is that one of the snaprings from the input clutch breaks. You will than in many cases find a piece of the snapring in the pan. I would say, if the noise is really a grinding one, i would not continue driving. An internal part can fail and destroy several others or even cause a complete destruction of the transmission. To know more about the severity, it could be wise to pull the transmission pan and check for metal shavings.
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JEEP Grand Cherokee 4.7 Lmtd 2004
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VW Beetle 2.0 TSI 2013
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