double transfer cases - The 1947 - Present Chevrolet & GMC Truck Message Board Network

csb#356 · 01-30-2011, 03:49 PM

I'm thinking about making a 205/203 double setup because A 203 can be had around here for about 25 bucks. (literally, I couldn't give mine away) And I'm Thinking that not only will i get lower gears but wouldn't it also give me higher gears for the highway? Does anyone have one of these setups and do you like them, And do they bring the rpms down on the highway quite a bit? I'm just looking basically for anyone that has one to tell me what you think of it Please. Much appreciated.

OldCreek · 01-30-2011, 04:40 PM

I'm pretty sure you will not get higher highway gears. I think the adapters to mate these are fairly expensive so make sure you "need" this setup.

csb#356 · 01-30-2011, 05:04 PM

Ok I just thought since when you put them both in lower it doubles the ratio so the same would go for both in high? And maybe bring the rpms down a bit. Of course I don't need this setup but I'm bored with a tax return and wanna build something. lol. I also just remembered finding a 203 with a 10 spline input shaft would be kinda tricky.

Plunkett · 01-30-2011, 05:35 PM

Running a doubler is mainly for offroading reasons. It gives you a lower crawling ratio. It's not going to cut down on the rpms in your truck while driving around town.

63chevyll · 01-30-2011, 05:50 PM

i want to do if but dont have the $$ for adaptor and $$ for shafts at this time and i think there is some $$ for shifters and some $$ and time for crossmember modification

csb#356 · 01-30-2011, 06:12 PM

I know its mainly for offroad which I do quite a bit of. Does anyone have one of these?

Plunkett · 01-30-2011, 06:15 PM

If you want to get some really good info, go to ck5.com or pirate4x4.com. Both of those sites will have all of the info that you want/need for putting a doubler in your 4x4. Also, Off road design sells all the parts required to install one in our trucks.

csb#356 · 01-30-2011, 07:27 PM

Ok thanks for the link

**Stocker** · 01-30-2011, 09:12 PM

Quote:

Originally Posted by OldCreek

I'm pretty sure you will not get higher highway gears.

Yes, I believe high range is direct 1:1 ratio in both. Double cases gives more gear reduction in low-low but nothing above 1:1 in high.

MTCK · 01-30-2011, 10:42 PM

Stocker is right. 1:1 and 1:1 is still.... 1:1. In low you will have 2:1 reduction (205 only) and 4:1 (203 range box and 205 in low). Big bucks. I'd love one. www.offroaddesign.com has lots of info. As mentioned, drive shafts, cross members, shifters, likely exhaust work...

Critter · 01-30-2011, 11:14 PM

Quote:

Originally Posted by csb#356

Ok I just thought since when you put them both in lower it doubles the ratio so the same would go for both in high?

For your theory to be correct one of the cases would basically have to have an "overdrive" set of gears in it. So, you would have to be able to put in one rotation and get out 1.3 rotations (just an example). That's basically what OD is in an overdrive transmission. On the other hand the transfer cases you mentioned when shifted into 4 low will divide the input rotations as opposed to multiplying them aka "underdriven". In other words if you put in 1 rotation the output will only turn .5 of a rotation. So when people create a doubler they take the 2:1 of the 203 and bolt it to the 2:1 drive of the 205 giving you a 4:1 crawl (2x2 not 2+2). Hope this helps.

Also, look here

csb#356 · 01-31-2011, 04:06 PM

Yeah I looked on ORDs website and there is way more things that I didn't Think about. I have a couple 203s and 205s but none are the correct ones, and quite a bit more modification would be necessary and more exspensive than i thought. Still would be cool to have one though

royo · 01-31-2011, 04:23 PM

Quote:

Originally Posted by csb#356

Yeah I looked on ORDs website and there is way more things that I didn't Think about. I have a couple 203s and 205s but none are the correct ones, and quite a bit more modification would be necessary and more exspensive than i thought. Still would be cool to have one though

North west fab I think is the name of it , they have more options for a doubler.10. 27 spline.

csb#356 · 01-31-2011, 04:43 PM

Thanks royo i'll Check them out

1malo68 · 02-01-2011, 04:35 AM

Quote:

Originally Posted by csb#356

I know its mainly for offroad which I do quite a bit of. Does anyone have one of these?

I bought my working Warn 8274 winch for $400.00 from this guy about 6 months ago and he had this setup at that time. He's been trying to sell it on CL for a long time now. You might be able to get it for a better price. I've seen it and it is what he says it is. Good honest guy. He's in Vegas. might be worth a call. FWIW
http://lasvegas.craigslist.org/pts/2157712852.html

csb#356 · 02-01-2011, 02:00 PM

Thanks I'll check it out and see if maybe he'll seperate it

01-30-2011, 03:49 PM	#1
csb#356 Registered User Join Date: May 2009 Location: Pinehurst, Idaho Posts: 311	double transfer cases I'm thinking about making a 205/203 double setup because A 203 can be had around here for about 25 bucks. (literally, I couldn't give mine away) And I'm Thinking that not only will i get lower gears but wouldn't it also give me higher gears for the highway? Does anyone have one of these setups and do you like them, And do they bring the rpms down on the highway quite a bit? I'm just looking basically for anyone that has one to tell me what you think of it Please. Much appreciated.

01-30-2011, 04:40 PM	#2
OldCreek Registered User Join Date: Jan 2007 Location: Central Coast California Posts: 1,026	Re: double transfer cases I'm pretty sure you will not get higher highway gears. I think the adapters to mate these are fairly expensive so make sure you "need" this setup. __________________ 1972 K20 Suburban 5.7/700r4/NP205 Dana 44/H052 Sold 1972 C10 5.3L/4L60E 12bolt 5Lug - Sold 1971 K5 Blazer 6.0L LQ9 4L60E NP205 Dana 44/H052!!! 1970 K3500 1ton CrewCab 8.1L/Allison1000/NP205 Dana 60/14B!!!! - Sold 1984 K10 SWB 7.4L/4L80e/NP208 Corp 10/12 bolt Sold 1988 V30 CCLB 7.4L/TH400/NP205/Dana 60/Dana 70/3.73!!! (Sold) 2003 K2500HD 8.1/Allison1000/NP263

01-30-2011, 05:35 PM	#4
Plunkett Registered User Join Date: Nov 2009 Location: Chattanooga, TN Posts: 140	Re: double transfer cases Running a doubler is mainly for offroading reasons. It gives you a lower crawling ratio. It's not going to cut down on the rpms in your truck while driving around town. __________________ 1987 gmc sierra v1500. 350 tbi, 700r4, 6" sky jacker lift, 15" Mickey Thompson wheels, and 35" bf Goodrich km2 tires.

01-30-2011, 05:50 PM	#5
63chevyll gets board easy....... Join Date: Mar 2009 Location: Colorado Springs Posts: 717	Re: double transfer cases i want to do if but dont have the $$ for adaptor and $$ for shafts at this time and i think there is some $$ for shifters and some $$ and time for crossmember modification

01-30-2011, 06:12 PM	#6
csb#356 Registered User Join Date: May 2009 Location: Pinehurst, Idaho Posts: 311	Re: double transfer cases I know its mainly for offroad which I do quite a bit of. Does anyone have one of these?

01-30-2011, 05:04 PM	#3
csb#356 Registered User Join Date: May 2009 Location: Pinehurst, Idaho Posts: 311	Re: double transfer cases Ok I just thought since when you put them both in lower it doubles the ratio so the same would go for both in high? And maybe bring the rpms down a bit. Of course I don't need this setup but I'm bored with a tax return and wanna build something. lol. I also just remembered finding a 203 with a 10 spline input shaft would be kinda tricky.

01-30-2011, 06:15 PM	#7
Plunkett Registered User Join Date: Nov 2009 Location: Chattanooga, TN Posts: 140	Re: double transfer cases If you want to get some really good info, go to ck5.com or pirate4x4.com. Both of those sites will have all of the info that you want/need for putting a doubler in your 4x4. Also, Off road design sells all the parts required to install one in our trucks. __________________ 1987 gmc sierra v1500. 350 tbi, 700r4, 6" sky jacker lift, 15" Mickey Thompson wheels, and 35" bf Goodrich km2 tires.

01-30-2011, 07:27 PM	#8
csb#356 Registered User Join Date: May 2009 Location: Pinehurst, Idaho Posts: 311	Re: double transfer cases Ok thanks for the link

01-30-2011, 10:42 PM	#10
MTCK Registered User Join Date: Dec 2009 Location: Fairbanks, AK Posts: 1,830	Re: double transfer cases Stocker is right. 1:1 and 1:1 is still.... 1:1. In low you will have 2:1 reduction (205 only) and 4:1 (203 range box and 205 in low). Big bucks. I'd love one. www.offroaddesign.com has lots of info. As mentioned, drive shafts, cross members, shifters, likely exhaust work... __________________ -Marcus 1991 V3500 L29 454 4L80E NP205 D60/14 Bolt 4.56's 1984 K30 292 TH400 NP205 D60/14 Bolt 4.56's flat bed 7'6" Meyer Plow 2022 Silverado 3500 L8T Project Daily Driver Project Heavy Hauler Project Plow Truck

01-31-2011, 04:06 PM	#12
csb#356 Registered User Join Date: May 2009 Location: Pinehurst, Idaho Posts: 311	Re: double transfer cases Yeah I looked on ORDs website and there is way more things that I didn't Think about. I have a couple 203s and 205s but none are the correct ones, and quite a bit more modification would be necessary and more exspensive than i thought. Still would be cool to have one though Last edited by csb#356; 01-31-2011 at 04:06 PM.

01-31-2011, 04:43 PM	#14
csb#356 Registered User Join Date: May 2009 Location: Pinehurst, Idaho Posts: 311	Re: double transfer cases Thanks royo i'll Check them out

02-01-2011, 02:00 PM	#16
csb#356 Registered User Join Date: May 2009 Location: Pinehurst, Idaho Posts: 311	Re: double transfer cases Thanks I'll check it out and see if maybe he'll seperate it



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