What does a transfer case doubler do?
The key to a Doubler™ setup, and the heart of the system, is the adapter and shaft that mate the 203 range box to the transfer case. The job of the adapter is to mate the 2 cases together and support the shaft that transfers the power from the 203 to the transfer case.
Can you change the gear ratio in a transfer case?
Two-Speed Cases Two-speed simply means you can engage a single different gear ratio in the transfer case.
What is a 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.
Does a 2 wheel drive have a transfer case?
Two-wheel transmissions have no transfer case. However, some vehicles like the two-wheel drive Ford Bronco II, have a dummy transfer case to ease conversion to four-wheel drive by only requiring a new output shaft.
Does 2WD have transfer case?
The basic difference is a 2WD is only propelled by 2x wheels, either the front or the rear wheels. There is no transfer case or extra driveshaft in a 2WD. You also won’t have a low range due to a lack of a transfer case with lower gearing.
Which NP205 for Doubler?
Input Bearing Size ORD bases its Doubler on a TH400-style NP205, which utilizes a larger/stronger 90mm input bearing. NP205s with the small bearing will require case machining in order to build a Doubler.
What is a NP203 Doubler?
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 exactly is a doubler transfer case?
Basically, the Doubler consists of the gearbox section from an NP203 transfer case coupled to a complete 205 transfer case. It’s a 3 speed transfer case system, it has options for the 1:1 and 2:1 options that an NP205 would normally have plus a double low range gear of 4:1 with both cases in low range.
What is a dual transfer case adapter?
A dual transfer case adapter is a device that adds an additional low range reduction gear set to your truck. It is sometimes called a doubler because one dual case adapter doubles the number of low range gear sets in your truck (your t/case’s low range + a second low range).
What is the lowest gear ratio for a 4×1 transfer case?
Your lowest gear would be 6x3x4 = 72:1 and you’d have a total of 8 gears (4 high-range and 4 low-range). Now, if you swapped in a transfer case with 4:1 low-range and changed to 5:1 differential gears, your lowest ratio dips to 6x4x5 = 120:1, a significant improvement.
What is the ratio of low range to high range differential gears?
Now, if you swapped in a transfer case with 4:1 low-range and changed to 5:1 differential gears, your lowest ratio dips to 6x4x5 = 120:1, a significant improvement. However, you would still only have 8 total gears, 4 low-range and 4 high-range.
