T-Case question.... - The 1947 - Present Chevrolet & GMC Truck Message Board Network

Devil'S Ride · 12-02-2003, 05:43 PM

Yeah, Im a bonehead, I put this in the 73-87 message board, but meant it for here, so I brought it over here, mebbe you guys can help me out...thanks!!

Ok, so I have heard that you can stick the NP 203 planetaries toa NP205 then bolt all that to yer tranny, and have yerself a dual T-Case 4-by.... in the end it leaves you with a fairly bulletproof 6:1 crawl ratio....if this is the case, does anyone know where I can pick up an adapter, an for how much? and also, how much work is it to do suck a conversion?? I am building a new TH400 for my rig and I was gonna go with the NP205 cause Im tired of the 203 chain driven crap...and when I heard of the dual setup, I got excited, so any info would be much appreciated!!

RockHQ · 12-02-2003, 06:25 PM

Well, not a 6:1 ratio since the gear reduction of the np203 is 2.01:1 and the gear reduction of the 205 is 1.96:1, so you get a combined gear reduction of 3.94.

Click here for lots more information.

Milenko72276 · 12-02-2003, 09:54 PM

http://www.offroaddesign.com/catalog/doubler.htm

Devil'S Ride · 12-02-2003, 10:11 PM

Cool, thanks guys, 'preciate the input...now I just gotta go rob a bank.....

Pont · 12-03-2003, 01:08 AM

Devil's Ride, sorry I can't answer your question about the 203 setup but I just wanted to welcome you to the board. Seeings how your so close and all, were practically neighbors!

Good luck on the t-case combo, keep us posted on your progress.

Devil'S Ride · 12-03-2003, 01:15 AM

Hey man, yeah I was just thinkin we were kinda near each other, an I find myself in grants pass at least once a month, so we'll have to catch up sometime.....
as for the T-Case thing, Im gonna have to pass for a while...my "poor college kid" income only allows for so much....:P
But I am gettin my TH400 an NP 205, so I'll just stick this TH350 an NP203 in a corner an keep it handy fer a while.....but yeah....too many ideas, never enough money....wish school wasnt so damned expensive!!!

Scrub · 12-03-2003, 04:17 AM

Welcome to the board from another Oregonian.

Make sure you get the t400 specific 205. There are different inputshafts for a 4speed, 350 and 400. And I think at least 2 different t400 inputs.

Good luck

*1FaastC10* · 12-05-2003, 12:55 AM

dont mean to hijack the thread, but does a double t-case fit under a stock floorboard in say, a Blazer? what type of offroading is this setup best suited for? mud and trail use, or crawling? how is the linkage setup for both cases?

Devil'S Ride · 12-05-2003, 06:43 AM

Should fit in most Chev/GMC applications, least from what Ive heard, have a friend that has one on a heep too,but I dunno how it is fitted under there.... It ends up giving you a 4:1 crawl, which is pretty low for a street driven play truck, IMO, but would be good for some *mild* rock crawlin, good for mud an trail use as well. From what I have heard its good all around. I also believe that it uses a twin stick. IE you shift your t case to 4 lo, then if you need a lower ratio, pull the other tcase into lo, an yer set.....

12-02-2003, 05:43 PM	#1
Devil'S Ride Registered User Join Date: Nov 2003 Location: Grants PassOregon Posts: 335	T-Case question.... Yeah, Im a bonehead, I put this in the 73-87 message board, but meant it for here, so I brought it over here, mebbe you guys can help me out...thanks!! Ok, so I have heard that you can stick the NP 203 planetaries toa NP205 then bolt all that to yer tranny, and have yerself a dual T-Case 4-by.... in the end it leaves you with a fairly bulletproof 6:1 crawl ratio....if this is the case, does anyone know where I can pick up an adapter, an for how much? and also, how much work is it to do suck a conversion?? I am building a new TH400 for my rig and I was gonna go with the NP205 cause Im tired of the 203 chain driven crap...and when I heard of the dual setup, I got excited, so any info would be much appreciated!! __________________ The Devil 1983 ONE TON 454/400/208 11" of lift on 44's

12-02-2003, 06:25 PM	#2
RockHQ ROCKET POWER! Join Date: Feb 2003 Location: Finland, Europe Posts: 509	Well, not a 6:1 ratio since the gear reduction of the np203 is 2.01:1 and the gear reduction of the 205 is 1.96:1, so you get a combined gear reduction of 3.94. Click here for lots more information. __________________ What did i do last nite? I had a wonderful time, That's what they tell me What did i do last nite? 1979 C-10 shortfleet: Olds 350, Th400, 12 bolt Current project: 1969 Olds 455 W-30, needing a rebuild

12-02-2003, 09:54 PM	#3
Milenko72276 Registered User Join Date: Feb 2002 Location: Richmond MO,USA Posts: 73	here ya go http://www.offroaddesign.com/catalog/doubler.htm Attached Images __________________ 72' Camper Special,454,th350,np205,4.56 locker,dana44 with spool,13" of lift and 44" boggers.soon to be 23" with rear disc brakes

12-02-2003, 10:11 PM	#4
Devil'S Ride Registered User Join Date: Nov 2003 Location: Grants PassOregon Posts: 335	Cool, thanks guys, 'preciate the input...now I just gotta go rob a bank..... __________________ The Devil 1983 ONE TON 454/400/208 11" of lift on 44's

12-03-2003, 01:08 AM	#5
Pont I need another Barley Pop Join Date: Feb 2001 Location: Grants Pass, OR Posts: 1,629	Devil's Ride, sorry I can't answer your question about the 203 setup but I just wanted to welcome you to the board. Seeings how your so close and all, were practically neighbors! Good luck on the t-case combo, keep us posted on your progress. __________________ 67 Short Fleet 4x4 04 Honda CRF450R 89 Toyota 4-Runner 34 Ford 2 door sedan - Long term project ---------------------------------------------- There is a very fine line between "hobby" and "mental illness"

12-03-2003, 01:15 AM	#6
Devil'S Ride Registered User Join Date: Nov 2003 Location: Grants PassOregon Posts: 335	Hey man, yeah I was just thinkin we were kinda near each other, an I find myself in grants pass at least once a month, so we'll have to catch up sometime..... as for the T-Case thing, Im gonna have to pass for a while...my "poor college kid" income only allows for so much....:P But I am gettin my TH400 an NP 205, so I'll just stick this TH350 an NP203 in a corner an keep it handy fer a while.....but yeah....too many ideas, never enough money....wish school wasnt so damned expensive!!! __________________ The Devil 1983 ONE TON 454/400/208 11" of lift on 44's

12-03-2003, 04:17 AM	#7
Scrub Collector of rusty Items Join Date: Dec 2001 Location: Sisters,Oregon USA Posts: 731	Welcome to the board from another Oregonian. Make sure you get the t400 specific 205. There are different inputshafts for a 4speed, 350 and 400. And I think at least 2 different t400 inputs. Good luck __________________ Scrub Sisters, Oregon - Home of the Sisters Rodeo. 70 GMC 1,000,000 + miles 72 K-20 project, 456 Dana60 front, Corp14 rear w/locker, 265R19.5 tires 20-ply. Warn 12k winches both ends, Cross-over steering with raised tie-rod, Powerbox steering, 4500 watt 120-AC power, Air, Hydraulic aux power, 4 inch lift, 5000 lb air-bags both ends.

12-05-2003, 12:55 AM	#8
1FaastC10 Account Suspended Join Date: Oct 2002 Location: Elkhart, IN Posts: 6,400	dont mean to hijack the thread, but does a double t-case fit under a stock floorboard in say, a Blazer? what type of offroading is this setup best suited for? mud and trail use, or crawling? how is the linkage setup for both cases?

12-05-2003, 06:43 AM	#9
Devil'S Ride Registered User Join Date: Nov 2003 Location: Grants PassOregon Posts: 335	Should fit in most Chev/GMC applications, least from what Ive heard, have a friend that has one on a heep too,but I dunno how it is fitted under there.... It ends up giving you a 4:1 crawl, which is pretty low for a street driven play truck, IMO, but would be good for some mild rock crawlin, good for mud an trail use as well. From what I have heard its good all around. I also believe that it uses a twin stick. IE you shift your t case to 4 lo, then if you need a lower ratio, pull the other tcase into lo, an yer set..... __________________ The Devil 1983 ONE TON 454/400/208 11" of lift on 44's



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