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05-01-2007, 11:12 AM | #1 |
Registered User
Join Date: Oct 2006
Location: davison Mich
Posts: 247
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whos running a doubler
was wondering what oil you are running in them have 203/205
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05-01-2007, 04:30 PM | #2 |
Senior Member
Join Date: May 2004
Location: Binghamton, NY
Posts: 3,469
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Re: whos running a doubler
IIRC need to run 80 weight....Dont have one yet, but hopefully soon I'll be getting one...
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2000 GMC CCSB 454/4L80 6” lift SAS 1999 Chevy CCSB 454/NV4500 4” SAS 1999 GMC Yukon 350/4L60 6" SAS |
05-03-2007, 08:51 AM | #3 |
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Join Date: Feb 2001
Location: East Central, MO
Posts: 11,336
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Re: whos running a doubler
I have always used 10w40 in my 203 and never had any problems.
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05-03-2007, 09:25 AM | #4 |
Registered User
Join Date: Jul 2006
Location: Central PA
Posts: 12,201
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Re: whos running a doubler
it matters if it's chain or gear driven right?
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The Garage: 1968 K-10 SWB - "Project Money Pit" 1996 Z-71 - "huntin rig" 1969 C-10 LWB (SOLD) "Project flip that truck or else" 1993 Passport, F@rd 1-ton (SOLD)"Project Cousin Eddie" My Garage Build "The 1,000 footer" |
05-03-2007, 11:20 AM | #5 |
K5Camper
Join Date: Mar 2004
Location: Pueblo, CO
Posts: 1,513
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Re: whos running a doubler
Yes, but a doubler 203/205 has no chain. It uses the bolt on rangebox from the 203 and the rear section that held the 203 chain is removed. What's left of the 203 is bolted to the front of the 205 via an adapter plate. ORD doesn't have the details of what fluid to use on thier website, but from what I remember reading, they don't make any major internal change (except for the shaft swapout in the kit) that would require anything different than what the two gearboxes were originally set up for.
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Rob Z. 1975 K5 350/465/205/D44/12b 4" lift on 35's- RIP 1991 K5 8.1L/NV4500/241/D44/14b FWC Camper |
05-04-2007, 12:10 AM | #6 | |
Bloo
Join Date: Feb 2001
Location: Barren County Kentucky
Posts: 6,283
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Re: whos running a doubler
and i have to be the idiot who ask-- whats the advantages of doing this?
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ASE Master Certified-GM Trained-Mechanic 1968 Chevy C30 157" WB Wrecker 1969 Chevy CST/10 SWB 1971 Chevy Custom/10 (first truck) 350, NV3500 5 speed 1971 Chevy K20 Custom Camper 4x4 350 TBI, SM465/NP205 1974 Chevy Custom Deluxe/10 1979 Chevy Custom Deluxe K10 farm truck beater 1989 Chevy K2500 Quote:
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05-04-2007, 12:41 AM | #7 |
Registered User
Join Date: Oct 2006
Location: davison Mich
Posts: 247
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Re: whos running a doubler
Basically, the Doubler™ consists of the gearbox section from an NP203 transfer case coupled to a complete 205 transfer case. This gives you an additional low range gear of 2:1 plus your existing NP205 low gear of 2:1 for an overall low gear of 4:1. Adding lower transfer case gearing gives you huge improvements in off road control and torque without affecting your highway gear ratios(4.10's with 37-38" tires can work well). Adding a gearbox also allows you to run in your normal 2:1 reduction or in super low 4:1 reduction for best performance in any situation. Or not putting a real low gear into your axles
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05-04-2007, 01:09 AM | #8 |
Bloo
Join Date: Feb 2001
Location: Barren County Kentucky
Posts: 6,283
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Re: whos running a doubler
can it be done with a 205 and 208, or just a 205/203?
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05-04-2007, 08:06 AM | #9 |
Registered User
Join Date: Oct 2003
Location: Central Vermont
Posts: 8,537
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Re: whos running a doubler
I run your basic 90w gear oil.
So far so good... |
05-04-2007, 10:48 AM | #10 |
K5Camper
Join Date: Mar 2004
Location: Pueblo, CO
Posts: 1,513
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Re: whos running a doubler
Most doubler's are based off of the 203/205 combo. Mainly because the range box can be unbolted from the 203 without much fuss. 208's and 241's have been tried, but since the case holding the chain in the t/case is the same that is holding the gears it's harder to separate. The one I have seen on the web took a 241 to mate to a 205. It took some major aluminum surgury to pull the 241 planetary set out and eliminate the chain portion.
203's are not the best t/cases in the world so they are cheap to almost free. So when you add the low cost to the fact that you can unbolt the "good" part of the 203 which is the cast iron range box, it's an easy choice to make a doubler out of it. NWF makes a similer kit to the ORD Doubler, plus there are other options to get more gear reduction. A Klune-v underdrive or Black Box underdrive. Both add another gearbox to gain gear reduction.
__________________
Rob Z. 1975 K5 350/465/205/D44/12b 4" lift on 35's- RIP 1991 K5 8.1L/NV4500/241/D44/14b FWC Camper |
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