Question about 2004 Subaru Forester

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Transfer case is popping/jerking in low speed turns

Just noticed in last couple days a popping/jerking when I make a harder turn at low speeds, thought the front tire was hitting something. Took it to tire place, they put it up on a rack and determined the noises are coming from the transfer case. This is a 2004 subaru forester, what could I be looking at here? Got more noticeable really quickly

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Center differential is broken,you can test it by doing tight circles in a car park 3 or 4 to the left and repeat to the right,if it doesn't un block and it still feels like you're driving over marbles (big ones) when you turn you're sure it's the c.diff.
Check tyres are all in spec.identical and same usage, right pressure.

Posted on May 18, 2009

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Posted on Jan 02, 2017

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Service 4x4 light is on...2000 gmc jimmy...replaced the switch on dash but nothing works..what is my next step to fix issue?


Two speed automatic or is it two speed selectable ? Either case the first thing would be have it check for DTC'S - diagnostic trouble codes . Both are computer controlled .
DTC B2725 ATC Mode Switch Circuit Malfunction
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This for the two speed selectable
The transfer case shift control module normally has battery voltage supplied to it at all times through the battery positive voltage circuit (CKT 40). When the ignition is ON, the transfer case shift control module conducts a self-test to determine if it retains the same memory it had when the ignition was last turned OFF. This self-test indicates whether the RAM standby power supply to the transfer case shift control module pin C6 was interrupted, which would result in clearing DTC's from memory. If the self-test fails the transfer case shift control module sets DTC 1.

You can check codes without a scan tool on this two speed selectable system . Do you know what the DLC is ? Under the steering wheel , connector to plug a scan tool into ?
Important: Check the transfer case shift control module for DTCs. The transfer case shift control module is not a class 2 device. DTCs are displayed on the transfer case shift control switch. Use the following four steps to obtain DTCs.
Turn OFF the ignition for 10 seconds.
Connect PIN 13 on the data link cable (DLC) to a ground. The DLC is located in the cab under the instrument panel on the driver's side.
Turn ON the ignition, with the engine OFF.
Observe the transfer case shift control switch select buttons for flashing codes.
DTC 001
DTC 002
DTC 003
DTC 004

Dec 30, 2016 | GMC Cars & Trucks

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2006 gmc envoy Denali 4wd will not engage


This vehicle had option of three different transfer case ! Which one of these is the one in your vehicle ?
Transfer Case - NVG 120-NR9 Transfer Case - NVG 126-NP4 Transfer Case - NVG 226-NP8
The New Venture Gear model NVG 226 RPO NP8 transfer case is a two speed automatic, active, transfer case. The NVG 226 provides five modes, Auto 4WD, 4 HI, 4 LO, 2 HI and Neutral. The Auto 4WD position allows the capability of an active transfer case, which provides the benefits of on-demand torque biasing wet clutch and easy vehicle tuning through software calibrations. The software calibrations allow more features such as flexible adapt ready position and clutch preload torque levels. The technology allows for vehicle speed dependent clutch torque levels to enhance the performance of the system. For example, the system is calibrated to provide 0-5 lb ft of clutch torque during low speed, low engine torque operation, and predetermined higher torque for 32 km/h (20 mph) and greater. This prevents crow-hop and binding at low speeds and provides higher torque biases at higher vehicle speeds, to enhance stability.
The New Venture Gear model NVG 126 RPO NP4 transfer case is a one speed automatic, active, transfer case. The NVG 126 provides only one mode, Auto 4WD, and is transparent to the operator. The active transfer case provides the benefits of on-demand torque biasing, wet clutch and easy vehicle tuning through software calibrations. The software calibrations allow more features, such as flexible adapt ready position and clutch pre-load torque levels. The technology allows for vehicle speed dependent clutch torque levels to enhance the performance of the system. For example, the system is calibrated to provide 0-7 N?·m (0-62 lb in) of clutch torque during low speed, low engine torque operation, and predetermined higher torque for 32 km/h (20 mph) and greater. This prevents crow-hop and binding at low speeds, and provides higher torque biases at higher vehicle speeds, to enhance stability
The New Venture Gear (NVG) model NV120, RPO NR9 transfer case is a single speed, full-time, all wheel drive (AWD), transfer case that incorporates a front/rear drive differential carrier assembly.

Nov 19, 2016 | 2006 GMC Envoy Denali

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Mercedes E320 Auto Diesel CDI jerking when changing gears


Have you let a younger faster driver borrow your vehicle the gearbox computor will learn the harder driving style and adjust the adaption data to suit his harder acceleration and make it jerky for you

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1 Answer

My 1991 mazda navajo 4x4 vibrates at mid to high speeds and leaks trany fluid from transfer case and transmission


Something is obviously out of balance. I am going out on a limb and guessing this.

and the faster you go, vibration is always more noticeable.

991 mazda navajo harmonic balancer - Google Search

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1 Answer

Whenever i put my jeep in four wheel drive, whether it is 4 hi or low, it makes a loud popping noise coming from underneath whenever i turn or accelerate too fast. is this a bad transfer case? and if so,...


If you are doing this on concrete, or hard dirt, most likely what is happening is that the two axles are turning at different speeds than each other. Most transfer cases are built so that the axles are always supposed to turn at the exact same speed whenever engaged in 4WD. The problem here is that, when you turn on slippery mud, your wheels are free to turn at different speeds. When you turn on pavement, they can't, and so they grind and slide over gears. I'd be really careful about using 4WD, and try and have a service shop look at it. Shouldn't be more than $50 for a checkup, and $3-500 would get you a great used one if its nibbled on the gears.

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1 Answer

At slow speeds my 02 Mountaineer turns like its in 4-low.


have the transfer case fluid changed, this is a symptom of worn out fluid, also add a bottle of friction modifier to the case.

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