Pump Rub refers to a gear pump failure in GM transfer cases from 1998-early 2007. The gear pump works by forcing oil to the planetary as well as the drive sprocket sleeve. The gear pump is driven by a shaft, so the housing of the pump must “float” in the rear housing of the transfer case.

What is Duramax pump rub?

Pump rub occurs when the four positioning tabs holding the pump in place wear over time. This causes the oil pump to come into contact with the housing itself. The result is a hole worn in the cover, causing fluid to leak and the probability of damaging the transfer case.

Can you bypass a transfer case?

No you cant really bypass the transfer case, it must be there for mechanical and electrical reasons such as the speed sensor on the back.

Does a transfer case have a pump?

GM transfer cases use a gear-driven pump inside the case that is driven off the mainshaft. Because of this design, the pump must “float” in the rear case half. There are four tabs around the edge of the pump that are used to locate it in the housing.

Is a 203 transfer case full time?

The New Process 203 Transfer Case is a fullsize, full time, chain driven transfer case. … The transfer case does have a locked setting for both low and high range operation, which locks the differential, disabling the full time behavior and equally transmitting power between the front and rear axles.

What are the symptoms of a bad transfer case motor?

• Gear Shifting Issues. …
• Difficulty Staying in 4WD. …
• 4WD Will Not Engage/Disengage. …
• Puddle Formation Directly Under the Transfer Case’s Location. …
• Weird Grinding, Growling or Humming Noises. …
• 4WD Warning Light Illuminates. …
• 4WD Transfer Case. …
• AWD Transfer Case.

What transfer case has PTO?

The transfer case PTO it is located on the truck chassis between the main transmission and differential. These gearboxes are mainly used for Vacuum Trucks, Hydrovacs, Fire Fighting Trucks, Cleaning Combination Trucks, Sweeping Trucks and Road Maintenance Trucks.

Can I still drive my truck with a bad transfer case?

Should you drive your car with a bad transfer case? Driving your car with a bad transfer case is a bad idea. If you continue to drive with a transfer case that has a serious mechanical problem, you could destroy it beyond the point of repair, and possibly damage your transmission, driveshafts and axles in the process.

Is the transfer case always engaged?

Registered. There is always power going through the transfer case even in 2wd.

How much does a np208 weigh?

Manufacturer:New Process GearGear Ratios:High Range1.00 : 1Low Range2.61 : 1Fluid Type/Spec:Automatic transmission fluid (ATF)Weight:75 – 80 lbs dry

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How do you identify NP203?

The NP203 is identified by several features: 1. The transfer case is made up of 4 sections bolted together, a range box (the gear reduction we use for the Doubler kit), the chain case which houses the chain drive to the front driveshaft output, the differential housing, and the output housing.

What did the NP203 come in?

The NP203 chain drive transfer case was used in 1974 to 1979 model year Dodge/Ford pickups and 1973 to 1979 model year GMC/Chevrolet pickups. Its biggest downfall is that the transfer case came from the factory as a full time unit.

What are the symptoms of low transfer case fluid?

If you hear grinding, growling, or humming noises that change with your vehicle speed, it may be coming from the transfer case. This could indicate a low fluid level or some mechanical problem such as bad bearings, loose chains or damaged gears.

What happens when transfer case encoder goes bad?

This is where the transfer case encoder motor comes into play. The encoder motor is what provides the power for your vehicle to switch back and forth between two-wheel and four-wheel drive modes. … Most times, when the encoder motor goes bad, the entire assembly needs to be replaced.

Does a transfer case do anything in 2WD?

The transfer case is located between the transmission and front and rear differentials via the driveshafts, creating a two-wheel drive (2WD) or four-wheel drive vehicle. … When the transfer case engages the front shaft, which feeds power to the front wheels, the vehicle then becomes a four-wheel drive.

How much does a transfer case cost?

The transfer case is also capable of synchronizing the difference between the rotation of the front and rear wheels. Transfer cases may contain one or multiple sets of low range gears for off-road utility. Typically, the average cost for a replacement is expensive, between $2,389 and $2,500.

Why is my driveshaft popping?

Driveshaft problems can be spotted from the moment you put the vehicle in gear to pull it into a bay. As the power is transmitted from the transmission to the rear axle, the slack from worn or damaged components is taken up, resulting in a sudden crunch or pop.

How long does a transfer case last?

There is no set time or mileage. We’ve heard of transfer case where they only last 6,000 miles (rare) and others that have lasted over 300,000 miles. Your driving habits and how closely you follow recommended maintenance procedures are the deciding factors. That is why it’s so important to get a good warranty.

Why is my 4-wheel drive making a grinding noise?

When you hear a grinding sound when turning in 4 wheel drive means you are experiencing drivetrain binding. The binding of the drivetrain transfers high levels of torque through the drivetrain and transfer case resulting in difficulty turning, grinding noises, and wheel hop.

Will a bad transfer case cause vibration?

Common signs include a noisy drivetrain, excessive vibrations, and oil leaking from the transfer case in all-wheel or four-wheel vehicles.

Why does my 4-wheel drive clunk?

The loud clunking sound can also emanate from your transmission when you engage 4-wheel drive on the fly over a certain speed. This is caused by the gears inside the transmission case as they engage to lock the front and rear driveshafts.

What did a 208 transfer case come in?

In Chevy and GMC trucks, the NP208 was used in the C/K 10 and C/K 20 pickups and the Suburban from 1981 to 1986. It was commonly found in trucks with the TH350, TH400 and TH700R4 automatic transmissions. Ford trucks that use the NP208 were the 1980 to 1986 Bronco, F-250 pickup and one-ton F-350 pickup.

How good is a NP208 transfer case?

The New Process 208 is a chain-driven transfer case. … This transfer case is a good gear box with a low ratio of 2.61:1. The weakest part of this transfer case is that the shifter fork wears easily, causing shifting problems. This transfer case was used in production vehicles manufactured from GM, Dodge, and Ford.

What did NP208 transfer case come in?

NP208 Transfer Case Specs & Information The New Process 208 (NP208) transfer case is a cast aluminum, chain driven unit that was used in many Jeep, Ford, GM, and Dodge vehicles. The NP208 was common in the GMC/Chevrolet K10, K20, and Suburban mated to the TH350, TH400, and TH700R4 automatic transmissions.

What is a 203 205 Doubler?

For more than 11 years now, Off Road Design (ORD) has offered a NP203/205 Doubler kit designed to multiply the low-range gear ratio of fullsize trucks and SUVs. … This combination of gearing vastly improves crawlability and torque multiplication without adversely affecting high-range cruising speed and engine rpm.

How do you know if something is NP205?

Identifying an NP205 is relatively easy: It has a cast-iron case and center idler shaft with a nut on the front and a three-bolt cover on the rear, is about 12 inches long, has a center rear output, and usually has an ID tag above the front output shaft.

What is a NP205 transfer case?

The NP205 transfer case is a heavy-duty, gear-driven unit manufactured by New Process Gear in Syracuse, New York. It was introduced in 1969 and used until about 1993. The part-time, manual-shift T-case was found in GM, Ford, Dodge, and International Harvester vehicles, and in some construction/industrial equipment.