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  #1  
Old 11-01-2014, 09:08 PM
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Welcome! Newbie here.

Hello all! I am a new member to the forum! I see myself asking some questions in the future. I am a medical school student, in school to be a general surgeon. I am a southern guy from Alabama, USA. I LOVE my Jeep! We have been through a lot together. Haha. I have a 2001 Jeep Grand Cherokee (WJ) 4.7 4x4. Some repairs that have been done- heater core (pain in the ass...dash coming all the way out!), radiator, AC, hubs, and etc. Modifications- Kolak custom 3 inch Exhaust (magna flow cats, flow master 50 exhaust, chrome tip), K&N FIPK, 2.5 Rusty's Lift Kit, JK 18in pull off wheels, Bridgestone Dueler AT 32" tires, Bilstein Shocks, and projector headlights. This car has 200,000 miles and has recently developed a transmission problem. I plan to get it rebuilt and keep this beauty on the road. The motor is too strong and there is too much right with this Jeep to just sell it or park it.

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  #2  
Old 11-02-2014, 02:49 AM
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Re: Welcome! Newbie here.

Welcome to the garage.
What happened with the transmission?
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  #3  
Old 11-02-2014, 08:05 AM
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Re: Welcome! Newbie here.

The transmission threw a P0740 on a 500 mile trip. Burned up the torque converter. When I finally got it checked out and the code read, it was too late. Torque converter won't lock up. Tranny fluid super contaminated with converter dust. If I'm going to drop the tranny to replace the converter- I might as well have it rebuilt completely. Along with a transgo shift kit and premium tranny fluid. Go ahead and have it done right. Any comments or suggestions?


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Old 11-02-2014, 10:47 AM
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Re: Welcome! Newbie here.

Donīt know what they charge for a rebuild overthere, but what about a low milage unit? Or if you have the time/space/knowledge etc and rebuild it yourself?
Regarding the fluid, just any ATF+4 compatible fluid should work out fine.
I also have the transgo shiftkit installed, it makes the shifts more rapid and crisp, but you will feel the shifts a bit more then before. Advantage is less wear on the clutches and lower transmission temperatures during city driving.
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JEEP Grand Cherokee 4.7 Lmtd 2004
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  #5  
Old 11-02-2014, 10:49 AM
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Re: Welcome! Newbie here.

Here they are wanting $1200 for a used one plus $300 install. So $1500. When I can have it fully rebuilt with shift kit and all good components for $2000. I thought that for $500 it would be cheap insurance knowing that everything in it is new and right. Plus most used units I've seen around here have 100,000+ miles on them. Any ideas? What brand of tranny fluid do you recommend? Is synthetic worth it? I want to get this done right the first time.


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  #6  
Old 11-02-2014, 11:02 AM
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Re: Welcome! Newbie here.

Wow, used units are expensive overthere. Hofmanestates on here bought a good used unit for about USD 200 i believe. Yeh, for sure a rebuild would be my choise then as well. You can do then another 200.000 miles. Regarding the fluid, ATF+4 is the recommended fluid and this is already a synthetic fluid. I believe Valvoline was the original supplier of this fluid, but there are now several brands producing it. Just look at the label that it is ATF+4 compatible. Some guys swear with Amsoil.
Here where i live, ATF+4 is very expensive and iīm using MOTUL Multi ATF, which performs good.
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JEEP Grand Cherokee 4.7 Lmtd 2004
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  #7  
Old 11-02-2014, 11:05 AM
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Re: Welcome! Newbie here.

Thank you very much! Quick question- since the transmission just went out, how much longer can I expect on the motor? It seems to be strong, isn't using oil or anything, good compression. Also- when the tranny is out, should I replace the rear engine seal for good measures?
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  #8  
Old 11-02-2014, 11:35 AM
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Re: Welcome! Newbie here.

Engine life depends on many factors. Was preventive maintenance done at the regular intervals, how has the jeep been driven etc.
The 4.7 engine is not a bad engine, as long as it was treated well. A bad PCV valve for example, can cause sludge formation and clogging of oil canals, which will result in oil starvation to respective bearing(s). Not changing the coolant before its additives are depleted, can result in internal corrosion and a lot of headache.
Overheating this engine will result in warped heads and probably in a later stadium dropped valve seats.
On high milage engines, you can expect worn valve chain guides at a certain point in time.
But as said before, when treated well, this engine will go far.
Regarding the rear crankshaft seal, my way of thinking is, donīt mess with it when its not leaking. Sofar i didnīt hear anybody with rear crankshaft seal leakage, eventhough there should be some around. On the other hand, the seal itself is most probably not that expensive and the shop can do it for you for a few bucks more.
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JEEP Grand Cherokee 4.7 Lmtd 2004
HID 8000K in low and fog / Quad Squad member
KYB Gas-a-Just shocks / Pirelli Scorpion ATR 245/65/17 - Transgo reprogramming shiftkit.

VW Beetle 2.0 TSI 2013
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  #9  
Old 11-02-2014, 11:45 AM
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Re: Welcome! Newbie here.

What's a PCV valve? How much is it? I don't know if mine has been changed recently and if it's a simple thing to replace- I'm getting right on replacing it. Your answer on the rear seal seemed contradictory- did you replace your wj rear engine seal when the transmission was out?


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  #10  
Old 11-02-2014, 12:06 PM
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The beast from Brazil

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Re: Welcome! Newbie here.

No, i didn't replace the rear seal.
The PCV valve sits on the oil filler tube. Its just a plastic piece of around 10 bucks and it should be changed or at least checked regulary.
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HID 8000K in low and fog / Quad Squad member
KYB Gas-a-Just shocks / Pirelli Scorpion ATR 245/65/17 - Transgo reprogramming shiftkit.

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  #11  
Old 11-02-2014, 12:09 PM
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Re: Welcome! Newbie here.

Is there any tricks or tips to changing the PCV valve?


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  #12  
Old 11-02-2014, 12:14 PM
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The beast from Brazil

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Re: Welcome! Newbie here.

Oh, and PCV stands for positive crankcase ventilation. This small valve regulates the amount of air passing through it, depending on the vacuum of the inlet. This air comes from the area below the pistons (blowby gasses and other bad stuff which can cause sludge when mixed with oil) and goes to the engine inlet, whereafter its burned off.
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JEEP Grand Cherokee 4.7 Lmtd 2004
HID 8000K in low and fog / Quad Squad member
KYB Gas-a-Just shocks / Pirelli Scorpion ATR 245/65/17 - Transgo reprogramming shiftkit.

VW Beetle 2.0 TSI 2013
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