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-   -   Which transfer case is best? (http://www.wranglerforum.com/f290/which-transfer-case-is-best-31939.html)

Jman062006 06-11-2009 10:44 PM

Which transfer case is best?
 
I am currently undergoing a LT1/700r4 swap and I was wondering which transfer case to use. It will be on the highway a lot with occasional offroading. I dont plan on plan on going to Moab or anything like that but would like a case the can take what you throw at it you know? I can purchase a trans with an np241 case, I currently have an np231. I was wonder which would be better or if I should get another case all together? Thanks for all advise.

1BLKJP 06-12-2009 12:18 AM

Probably the cheapest and easiest to find is going to be the NP205. You can also find some GM NP241 cases that were driver drop. The Jeep cases will not bolt up to your tranny. The 700R4 is a 27 spline output shaft.

What axles are you going to be using?

Jman062006 06-12-2009 12:31 AM

how reliable is the 205? Is the 241 stronger?

1BLKJP 06-12-2009 12:33 AM

The 205 is a cast iron case that is gear driven. It's been behind GM 4wheel drives for years. The 241 is an aluminum case that is chain driven. Never going to be as strong. The 205 does have some gearing limitations in it. I think the deepest you can get is 3:1.

Of course if you have money to burn then a Stak or Atlas II case would be an awesome addition to your build. :D

Jman062006 06-12-2009 06:27 AM

Would the 205 be better than my 231 that is freshly rebuilt?

buckshot500 06-12-2009 08:46 AM

The hot ticket for the NP205, is to get hold of an NP203 & put the 203's range box on the 205! I'm reasonably sure it's used as a doubler.

Not sure exactly what your gonna get, but lower t-case output ratio & some extra shift options (more gears & gear choices) are the general idea.

When I go to full width axles, I may do this deal.

jpdocdave 06-12-2009 09:13 AM

i'm builiding the 203/dana 300 doubler. the dana 300 is a little more commonly used in jeeps because its smaller. the 205 is basically the toughest case there is w/ the d300 right behind it. since it will bolt right up you might as well do it.

but the 205 sits so low some people don't like to use it. i like doublers, but you gotta be careful about drive line length then, the jeeps wheel base is so short.

the np231 and 241 are really decent units, if you aren't going crazy you won't have any problems with them either.

like jack said, keep in mind what axle you want in front, because the 205 and d300 are right side drop cases, the d300 can be flipped at least.

1BLKJP 06-12-2009 05:09 PM

Quote:

Originally Posted by jpdocdave (Post 386539)
i'm builiding the 203/dana 300 doubler. the dana 300 is a little more commonly used in jeeps because its smaller. the 205 is basically the toughest case there is w/ the d300 right behind it. since it will bolt right up you might as well do it.

but the 205 sits so low some people don't like to use it. i like doublers, but you gotta be careful about drive line length then, the jeeps wheel base is so short.

the np231 and 241 are really decent units, if you aren't going crazy you won't have any problems with them either.

like jack said, keep in mind what axle you want in front, because the 205 and d300 are right side drop cases, the d300 can be flipped at least.

Chevy made both a right and a left side drop 205.

And yes the 205 is going to be much stronger behind a V8 than your 231. Plus your 231 will not bolt up to the 700R4.

Jman062006 06-14-2009 09:36 AM

It sounds like the 205 is the way to go with me. Which vehicles did they come on? I was thinking of eventually going to a d44 up front and a ford 8.8 of dana 60 in the rear. Which drop is the 44? and what vehicles had those? Thanks for all input

jpdocdave 06-14-2009 10:22 AM

tough question with many variables, its best to figure it all out now. so you can buy a t case with the output on the same side as the axles you buy. i bought d44's front and rear out of a 79 scout, the front axle requires a little work to change the pinion and caster to do it right, not a diy job. the rear is super simple. but this way my front axle is the right side drop and both my axles match the bolt patterns.

i'd suggest finding them out of the same vehicle, bolt patterns will match right up. figure out what wheeling you wanna do, and what size tires you want. a d60 isn't really needed untill you go over 36 or 38" tires in my opinion. gm trucks are easy to find a d44 front, and a 14 bolt rear (which is bomb proof) but its gigantic, and you lose ground clearance for it. 8,8 is a good rear axle, but nothing that beefy is gonna match the bolt pattern other than the stock front d30, which you could just build up a little.

there's even more variables, decide what wheeling and tires you wanna run, then that will be how you determine what axles you want.

Jman062006 06-14-2009 04:33 PM

I think I will be running about 33" or 35" tires. It will be doing alot of highway driving and moderate offroading nothing too extreme. Is there any newer vehicles that had both d44's that might be easier to find at a junk yard?

jpdocdave 06-14-2009 07:11 PM

with that info i'd suggest going 8.8 in back, and beefing up the front d30. doesn't sound like you need to go crazy, and i can't remember what trans you said, but i'd just use a gm 241 if it bolts up to your trans, they are not bad cases. otherwise adapters for other cases run 600 bux easily.

Jman062006 06-14-2009 08:08 PM

700r4 for the trans and the one I can buy comes with a 241 i believe. Would the 8.8 have the same bolt pattern? What should I do to beef up the d30?

Jman062006 06-14-2009 08:35 PM

Isn't there a year (I believe it is 89) when they made the valve bodies a lot stronger in the 700? From what I hear is was more dependable just curious if anyone else has herd this?

jpdocdave 06-14-2009 08:49 PM

not sure on which 700 trans, but the 8.8 will have the same bolt pattern as the d30 front, thats why i suggest just doing that. they make a super 30 kit or something like that, thats all i'd say you really need.

Jman062006 06-14-2009 09:48 PM

Kool man I really appreciate the help I will look into that kit. Which gears do most use when in my situation a lot of highway and a little offroading? 4.88s?

Jman062006 06-14-2009 09:51 PM

the trans and t case i can get are out of an 87 jimmy and i was reading i think it comes with a np 207 are they any good?

Jman062006 06-16-2009 06:14 PM

anyone?

1BLKJP 06-16-2009 06:31 PM

An NP207 isn't a bad TCase. jeep used them before they went to the 231. I think they stopped using it in 1987.

If you are going to mount that case to a 700R4 you are going to have to get an adapter setup to do so. The spline counts don't match between the two. The adapter includes a new output staft on the tranny itself.

Oh, and if you have a v8 you don't even remotely need 4.88's to cruise on the highway with 35's. :D You'd be fine with 4.10's or even 3.73's.

Jman062006 06-17-2009 07:39 PM

would the np205 and 241 bolt right up to a 700r4? I just found a good deal on a 205 just rebuilt and ive herd they are one the best cases?

jpdocdave 06-17-2009 08:20 PM

www.novak-adapt.com has lots of great info on what bolts to what, or what needs a special adapter.

Jman062006 06-17-2009 10:12 PM

So with what Im reading it looks like the only bolt up case with 27 splines to match the tranny is the np 241 so I guess Ill go that route if you all think it will hold up?

Jman062006 06-17-2009 10:15 PM

well I was just reading that the 208 is the same spline count which one is stronger?

1BLKJP 06-18-2009 05:32 PM

I think at 208 is going to be stronger than the 241. It's an iron case and gear driven instead of aluminum case and chain driven.

Jman062006 06-19-2009 07:44 PM

Which year explorer is best to get an 8.8 out of? Does it have disc brakes?

Jman062006 07-19-2009 09:07 PM

Quote:

Originally Posted by 1BLKJP (Post 389163)
I think at 208 is going to be stronger than the 241. It's an iron case and gear driven instead of aluminum case and chain driven.

what years and models did those cases come in? My local junk yards cant look it up by case it has to be by vehicle. (drivers side drop)

jpdocdave 07-19-2009 09:13 PM

did you get the 8.8 years figured out? the disc brake axles were on around 95 and up, 96 for sure. the earlier ones are still pretty strong, just with drum brakes. as long as they have the 30 or 31 splines they are strong, disc brakes are just a bonus. the drum brake 8,8's are very affordable.

Jman062006 07-19-2009 09:49 PM

I already bought the 8.8 out of a 97. Disc brakes and 4.10 gears to match the d30. pretty sweet

jpdocdave 07-19-2009 10:05 PM

very nice

Jman062006 07-19-2009 10:14 PM

now I am just trying to track down a 241 transfer case. I think I need one out of a chevy 1500 but im not sure.


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