NP205 3-to-1 LoMax Gears plus Case Kit
Part #2800 -- $2,500.00 (10-spline, gears + empty JBC case, build it yourself, instructions here)
Part #2822 -- $2,500.00 (32-spline, gears + empty JBC case, build it yourself, instructions here)
Components:
- LoMax 3-to-1 Gear Set (5 total)
- JBC Case
- GM 10 or 32 Spline Input Gear
Options:
- Rebuild Kit
FAQ
Q: What is needed to complete the build-it-yourself gear and case kit?
A: The build-it-yourself gear and case kit will need a donor NP205 for the remaining parts. We highly recommend an NP205 Master Rebuild Kit as well if you choose this route.
Q: How many hours will it take me to complete the build-it-yourself gear and case kit?
A: There are many variables that affect the answer and everyone's mechanical skills are different. The build-it-yourself gear and case kit should take the same time as required to build a stock NP205 since the build steps are basically identical. The intermediate gear assembly is a bit easier to install on the Lomax case due to the presence of a bottom inspection cover. Typically, the build time would be between 3 and 6 hours depending on equipment, facilities, and personal experience.
Q: Do you include instructions with the build-it-yourself gear and case kit?
A: See the LoMax 205 instructions (PDF) which is listed on our Installation Guides page.
Q: Can I buy all of the remaining parts from JBC to complete the build-it-yourself gear and case kit?
A: While we have most of the parts, we do not sell all of the parts necessary ... yet. Some parts are difficult to source and we reserve those for complete units. We are working on sourcing and this could change in the future. If you do not have a donor NP205, the better option is the built unit.
LoMax 205 3:1 Gear Set
The new gear set is being manufactured to high tolerances using 8620 alloy standard to the gear industry. Heat treat processes and hardening are being performed to exact New Process Gear specifications as dictated by the original OEM NP205 drawings.
Case - front view
The new LoMax gear case (available in a DIY kit or as a built unit) is a high quality ductile iron casting. The new case is fully compatible with the stock NP205 shift forks, output shafts, shift rails, bearing retainers, etc. The GM round pattern (6 bolts) and the long 8-bolt pattern are present in the front face of the case. Although not shown in the front view photo above, alternate bolt holes will be provided to allow an upward rotation of the new case. Our goal is to provide the owner of a stock GM NP205 with a new case that will directly replace the original with no changes to driveshaft length, shifter linkage, etc.
Optional Mounting:
When totally assembled, the LoMax 205 weighs in at 135 lbs. The bottom inspection cover is equipped with an optional mounting boss to accompany the side mount common to the stock GM case.
Case Comparisons:
The new LoMax case is thicker than the original New Process case however it is more compact overall.
The LoMax case is the same length as the stock case. Shifter location
and driveshaft lengths do not change with the addition of the LoMax case.
Gear Comparisons:
Due to the longer tooth width of the LoMax gears, gear strength increases over that of the stock
New Process gears. Stock NP205 tooth width is 1.25" whereas the LoMax tooth is 1.50".
The original NP205 uses a tapered roller bearing arrangement to achieve
maximum thrust load capacity as opposed to a straight roller bearing and
thrust plate design found on lighter duty cases like the Dana 300 or Atlas II.
The NP205 is the undisputable King of strength when it comes to 4x4 transfer cases.
Aside from some of the bigger commercial designs, there is nothing that comes close
to competing with the NP205 when it comes to brute gear strength.
