Np203, Np205 &np208?

[DennyB]

Which t-case would be the best to mate to a 700r4?

Also, how can I identify the difference between them?

[Scrub]

Well,
I don't know if a 700r4 was ever mated up to a 205, but a 205 is the ONLY t-case to own. a 203 is full time 4wd and part time boat anchor. I don't know anything about a 208, but I have never heard anything good about one either.

I found this quote about a 208
"But certain aluminum housings—like the NP208 and NP231—have earned reputations for weakness and cracking under severe-duty conditions. So if you’re modifying your 4x4 with big tires or a torquey motor, make sure your stock T-case is up to the load, or consider a swap. "

I did a little searching on the 700r4 with a 205 and I think you need a Klune adapter to get them mated up.

Disclaimer: I don't know jack about a 700r4 and they might be great, but the empression I get is when one goes, they are 1200 bucks to rebuild and the early ones are rumored to grenade on cue. You might look into trading it for a th400, which will mate up to a 205 and is known to be the stongest thing since the hulk, granted, no overdrive. (remember my disclaimer)

http://www.fourwheeler.com/techarticles/68958/ has info on how to ID a 205

Good luck

[srhart71]

I run a np205 behind a 700R4 and I love it. Of course I have thrown a lot of money into it to upgrade the tranny to live behind my big block. What you will need is a tailshaft from Advanced Adapters to make the tail end just like a T350. Then the adapter and transfer case (np205) will bolt right up. Go with what you want and have fun.

[DennyB]

Thanks for the input srhart71 & Scrub . I've been wrenchin for a long time but not w/ 4x4s.
Scrub ,
From what I understand the np208 where put behind the 700r4s.
I know a fella around here that does a mild preformance rebuild of the 700r4s and200r4s for about $600.

This is not planned to be a "monster"
I'm only looking to build a 360+- HP stroker and I dont plan to run huge wheels.

Can someone explain what a fulltime 4wd is. I understand that it allows you to run it in 4wd on dry road conditions but how?
Does it have clutches inside like a limited slip rear?

Thanks,
Denny

[DennyB]

Originally posted by DennyB
...

Can someone explain what a fulltime 4wd is. I understand that it allows you to run it in 4wd on dry road conditions but how?
Does it have clutches inside like a limited slip rear?

Answered this myself with Scrub's link.
Thanks

[Scrub]

Another way to goe is to get a divorced 205 t-case, which would be cheaper. You just have a short driveshaft off your 2wd 700r4 which goes into the front of the case. Dodge had divorced 205's, If fact I have one for sale for 200 bucks.

You would have to fab up a crossmember.

I would really stay away from the 208

[JIMs70GMC]

All the 208 gets you is a slightly lower low gear (2.61 to 1.96). Weaknesses abound- aluminum case, chain driven, slip yoke out put. remember the 208 is not a full time case only the 203 is full time.

[Bill W]

208's have known weakness when coupled with very large tires and high horse power engines. In stock form and mild mods it is fine. I've got a 91, 1/2 ton, 4x4 suburban with 700R4 and 208 with slip yoke with 160,000 miles on it with no problems. Front hubs stay locked in about 4 months out of the year in the winter so the wife can lock in 4 hi whenever she needs it.

Bill

[bouncytruck]

The NP203 isn't a bad case. It is stronger than the 208 but not as strong as the 205. They are chain driven and heavy. Several companies make part time kits for them but if you do that, you have to run them in 4wd once in a while because the chain is what slings the oil for lubrication. They are a strong case. The 203 is used in conjunction with the 205 to make a double for rock crawlers, etc.

Unless you are going to be doing some extreme 4x4ing, you'll probably be ok with a 208. I think you can buy adapters for the 205 to mate up to the 700R4 but they are kind of $$$.