Can someone school me on transfer cases

[riotwarrior]

203 Fixed yoke
205 Fixed yoke
NP 208 don't know..???? never had one
1345 Fixed yoke
1356 Bronco = fixed yoke
1356 F 1/250 = slip yoke NO PTO
1356 F 350 = slip yoke PTO provision on front half of case which BTW is aluminum not magnesium front half

Not sure what came next but I know the last F250 I was going to replace a tcase on was bout 96 and had a fixed yoke case too!


Most every Ford with a married tcase has a base 6 bolt flange and 31 spline input from early 70's to mid 90's when the Super Duty came out with a different flange and spline count/size

JM2CW

 

[FORDF250HDXLT]

if you were going to have a t-case divorced into an f450 (so as to keep the driveline brake to pass safety inspections) which one would be ideal and why?

 

[crash-harris]

You'd be stuck with a NP203 or 205. I don't think the NP208 was available in a divorced configuration. Neither the B&W 1345 or 1356 were available in a divorced configuration. Could probably get an Atlas or Advanced Adapters divorced t-case and the sky (or your check book) is the limit with those.

 

[riotwarrior]

Divorced 205 or dana 24...obscure 203 is hens teeth

 

[subway]

Just got rid of a np208, it had fixed yokes that I stole to upgrade my np205 I put under my 94. From what I have read it was available in fixed or slip yoke but was not a divorced case.

Like mentioned my 94 had a 1356 with a slip yoke from the factory.

So far it is working well having a np205 under my 94. It makes for a long front driveshaft though. Right now my intermediate shaft is about 28 inches, rear about 46 and front about 70. The front shaft I still have to make but will have a carrier bearing on my transmission cross member.

Sent from my SPH-L720 using Tapatalk

 

[riotwarrior]

I woild love find divorced 203...seen em but long time ago

 

[crash-harris]

One day I'd like to do a 6x6 build with a divorced 205 with the output shaft from a 200 to drive the seperate rear driveshafts, but then there is the dilemma of how to keep it cool. Maybe Atlas could be persuaded to build a divorced single input, dual output, single range case

 

[FORDF250HDXLT]

One day I'd like to do a 6x6 build with a divorced 205 with the output shaft from a 200 to drive the seperate rear driveshafts, but then there is the dilemma of how to keep it cool. Maybe Atlas could be persuaded to build a divorced single input, dual output, single range case

haha cool.

hey,could you:

1993 f-super duty (f450) AKA log truck lol - divorced np205 x 2 right back to back - rear gears 5.13 - install front dana super 60 (05+ f550 axle) w/ 4:30 gears
purpose:
shift rear most t-case into N - so rear driveshaft doesn't turn.- turn off 5.13 gearing.
lock front hubs.shift front t-case into 4hi - turn on 4:30 gearing.


major con: no 4wd due to mismatched gears.(in a pitch,crawl out of a sticky situation though in 4lo)

but 4:30 more economy friendly gearing when in "front wheel drive" running empty/light and without locking the hubs,a nice set of crawling gears,especially if you shift both t-cases into 4 lo right?

is this theory sound? or am i off my rocker?

 

[crash-harris]

Nope. You're either turning the centered rear driveshaft by itself, or both rear driveshafts with that setup. On top of that, if you lock in the front hubs on a part time 4x4 setup on a hard surface, like asphalt, your going to grenade something.

Edit: I misunderstood, sounds great in theory, but if you've ever dropped a rear driveshaft and had to pull it and drive down the road/turn around with the fronts locked in, you'd think differently. Front will still bind up some on asphalt with no rear driveshaft in.

 

[FORDF250HDXLT]

yeah iv had to do that a few times.never experienced any issues running in "front wheel drive" to get her home any of those times.i did need to shift from park right into D quickly after starting the engine for it to go into gear though.

hmmm.wouldn't it be neat of you could customize a np205 lo range gearing so as to set yet another! a 3rd front divorced,with a custom gearset to make 4:30 front gearing blend with 5:13 rear gearing (with either 1 or both rear cases in lo range) while in lo range (iv no use for 4wd high anyway in this truck) my brain is going silly on me tonight probably i dunno.

 

[jwalterus]

there was one posted a long time ago (read: years), might have been a CL ad.....

guy was selling it, custom 6x6, had a divorced t-case above the rear axles that ran 4-high (1:1) all the time, thus it ran 6x4 when in 2wd on the main, and 6x6 when in 4wd.

I personally think the best option to do it would be that same setup, but run a later electronic controlled t-case in rear, that way you could truly run 6x2, 6x4, or 6x6 depending on your mood

edit: FOUND IT!!!!!!!


http://www.oilburners.net/forums/showthread.php?19860-6X6-IDI-check-this-out!

'twas a fleabay ad....

 

[FORDF250HDXLT]

check this out:

Our NEW 3 stick shifter uses one stick to shift the 203 gearbox and 2 sticks on the NP205, allowing individual control of the front and rear drive shift rails. This gives smoother shifting characteristics and with the proper internal modifications to the NP205, will allow easy access to front wheel drive and rear wheel low range. This allows you to use the full potential of your transfer case for maximum maneuverability. Price for the 3 stick is $289 and includes floor boots and all the parts shown.

You must be registered for see images

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

so 1 case can be made for super low range,custom 3 handle shift to allow front wheel drive when it's modded to do so.slick!

now to figure out what, if possible to place in the front driveshaft to make ^ that 205/203 "doubler" which is now 4:1 + 5.13 + e4od 1st gear + tire size (crawl ratio is? edit: 55.61:1 double edit: it's technically "3.94" lo range,so my actual rear crawl gearing ratio would then be; 54.78:1 )

now,to make 4.30 + front t-case of some sort? to = same crawl ratio and bobs my uncle? edit: would need a t-case lo range in line of the front drive shaft of 4.7 (well,it would already have 3.94 of it from the doubler,so another .76) so to match same crawl ratio with both handles of rear t-case in lo range to the rear.

can you put a t-case in the front driveshaft? why not?
impossible?...........nothings impossible! am i loosing my marbles or am i onto something hot here? 4:30 running empty in front wheel drive gearing + 4wd with a nice slow crawl + 2wd high as normal when hauling heavy with 5:13 gearing.i just need to find the missing link.....then figure out a way to put a 4th handle in the cab lol.

another edit; well.ha! wouldn't that just be slicker than snot if you could change the gears going to the front drive shaft (in lo only,in my case) right there in the same case to make it spin however you needed to account for mismatched front/rear gearing.oh man.if only and done.

 

[riotwarrior]

check this out:

You must be registered for see images

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

K thats funny cause the F150 w NP 203 in it I have been trying to get...just showed up at my yard...3 plus years I have been working on this tcase....

Patience....

So it is even partially pulled but due to lack of I am guessimg skill or tools they stopped.

I should have that bad boy out in 45 .in to hr when I get to it next week.

Even has full solid 44 complete w radius arms and brackets etc....may ask bout that too

HoRdEr they say....no parts specialist I respond.

 

[crash-harris]

there was one posted a long time ago (read: years), might have been a CL ad.....

guy was selling it, custom 6x6, had a divorced t-case above the rear axles that ran 4-high (1:1) all the time, thus it ran 6x4 when in 2wd on the main, and 6x6 when in 4wd.

I personally think the best option to do it would be that same setup, but run a later electronic controlled t-case in rear, that way you could truly run 6x2, 6x4, or 6x6 depending on your mood

edit: FOUND IT!!!!!!!


http://www.oilburners.net/forums/showthread.php?19860-6X6-IDI-check-this-out!

'twas a fleabay ad....

I'll be all mechanical on the case linkage. Plan to run a B&W1345 or 1356 that will drive the front shaft and hi/lo range selection, then a short intermediate shaft to the 205 with the range selection locked out so it'll only switch between 2 and 4 wheel. That way there would be no chance of me forgetting and having 2 t-cases in different gears. But that will also give me the option of running just 1 drive axle most of the time, switching to both under heavy load and then locking the front in and going full 6x6 off pavement.

 

[junk]

I think you can twin stick a 205. Then each stick runs an output. So one stick runs front output and one stick runs the rear output.