2004 grand cherokee 4wd to 2wd mod
 

Hi,
I have a Jeep grand Cherokee 2004 4.7 V8 - if i remove the front drive axle, will the car give better gas mileage,

thanks and regards
Hasan

Do you know which 4WD system you have? It's printed in front of the shift levers. If it's SELEC-TRAC, you can leave the shifter in 2WD for better gas mileage. It it's QUADRA-TRAC I, QUADRA-TRAC II, or QUADRA-DRIVE, there's nothing really you can do, although I'd recommend using a fuel system cleaner, making sure your spark plugs are goo, , and keeping up on regular maintenance (such as oil and filter changes), all of which can affect gas mileage. Make sure you use high mileage oil for optimal performance and gas mileage as well. I wouldn't remove the front driveshaft, as you never know when you'll need the 4WD. Plus, it's a pain to remove the front driveshaft (I used to have a 2005 4.7L Grand Cherokee and I had to have my front driveshaft replaced due to the original one wearing out... the mechanic who did the work said how much a pain it was to remove and replace, so obviously I wouldn't recommend it unless you need to replace the driveshaft).

-Vince

Dear Sir,

yes it is a quadra-drive, i am using BP Visco full synthetic engine oil, main reason to remove front axle is to increase the acceleration, this car has lot of torque, climbs over the bridge without any change in RPM, i have changes several chassis and engine components, new radiator/thermostat/IACV/TPS/air temp sensor/mopar spark plugs/fuel filter(was very dirty)/front and read shock and springs (JDM)/all 7 control arms/water pump/air filter and many more, i use mopar fuel system cleaner once a month

only one more problem the check engine light comes on now and then, checked the code, it was oxygen sensor, changed all of the oxygen sensors, but still light comes on, as per one of the mechanics, the head gasket is cracked, so one of the sensors are detecting water - i dont know weather it is correct

the car is running very well, the fuel mileage has gone better, just need to add some extra acceleration

thanks and regards
Hasan

1999 Laredo Quadra-Trac II
 

My front and rear differentials are apparently both open differentials, meaning they aren't part Vari-Lok. Why is this important to me? CV axles, transfer case woes, alignment . . . it all matters

The quadra drive system comes with vari-lok differentials on the front and rear axles and the CV axles are different measurements than they are on a Quadra-Trac II system. I assumed Quadra-Trac II meant it was some version of Quadra Drive but after extensive research, and a gamble on ordering the wrong part or two, I have discovered the CV axles should be ordered as if they are part of the Selec-Trac system (meaning not quadra drive and as if it was without a Vari-Lok system). Some would say that this is obvious if you spin a wheel, that if it were vari-lok, they would spin opposite one another when jacked up. The Vari-Lok system and the Quadradrive system will be listed on your build sheet but won't be listed if you don't have them. There is no sales code or vin designator for it and the NV247 or NP247 t-case were used on both jeeps with and WITHOUT the Vari-lok diffs. With Quadra Trac 2, just remember that you want the passenger side CV axle that is 40 1/8 inch compressed length. [technically doesn't matter which size you use on the other side as both will work. OH! and if you have the axle without varilok, you can remove the front drive shaft and run on a broken t-case for quite some time. The p/n on the differential cover is P/N 0919-21 or maybe 0919-27 (can't really tell form all the years of wear-and-tear). Not sure if varilock has the same partnumber as the open diff for the diff case. . . if you have a varilok with a diff that has this p/n lemme know.