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Old 04-07-2015, 07:35 PM
Cataldo Cataldo is offline
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NP 203, 205, 208, 241c, vs. Quadratrac

Hello IFSJA

This is a little out of my element, hence why I am asking the question. In a FSJ behind a 700r4 (Passenger side drop) with a Mild SBC or LSX is there a viable strength benefit with the New Process cases over the Q/T? I like the idea of a part time kit, mostly to run a locker in the rear (No weather here in Southern California). The NP205 is obviously a beast but kind of a pain to find and put behind a 700r4. I do not know too much about the NP203, is it all the problems of the NP205 with out all of the benefits (Gear instead of chain)? I have the feeling that 'If your gonna hang an old cast iron Trans Case off the back of a 700r4, make it a NP205' kind of thing. The NP208 and NP241c's are very comparable, except the np241c is slightly improved and has a slip yoke eliminator aftermarket support system. The NP208's are very common and I have yet to find a driver side mechanical speedo NP241c. Is it possible to convert an electronic np241c to mechanical?

So, I am left with a few viable options:

1.) 27 spline 6 bolt circular (TH350 1986+ Chevy trucks) Not common.
-I do have a line on a good 8 bolt 32 spline np205 for a good price, but I for see this being a slippery expensive slope

2.) 27 spline 6 bolt NP208 (Most common, direct bolt up to 700r4, correct me if I am wrong)

3). NP241c Same as option 2, if found for good price trumps NP208

4.) Along with the '75 Wagoneer I am picking up, it comes with a 700r4 set up for a Quadratrac! This makes for a very nice quick and easy swap. I'll probably swap this in ASAP and run it for a while. I know there is quite a heated debate over part time converting Quadratracs, for me, a part time case is more desirable.

Leaving the NP205 out of the mix, and agreeing the NP208 and NP241c are very similar in strength, how would a NP208 compare to a Part time converted Quadratrac in strength, longevity, exc? I would imagine the chain in the NP's would last much longer than the Q/T, since even in 2wd the Q/T is still using the chain.

Price wise I figure any option (Other than just sticking with the stock Q/T) would be comparable. ~$650 for part time with hubs and new chain

The transfer cases I can grab for ~$150 complete. Plus costs to rebuild and new tail shaft in the 700r4.

What are your thoughts on this? This is mostly future planning, its helping me formulate a budget for the transfer case and a plan of attack.

As a wild card do any of the New Process transfer cases make a particularly easier conversion to a 4l80e? (Never know if one of those were to fall out of the sky).

Thank You

Edit:
An adapter to mount a 32 spline 8 bolt 'racetrack' np205 to a 700r4, pricey but having the ability to upgrade to a 4l80e later is nice (Changes 700r4 output shaft to 32 spline.)
http://www.advanceadapters.com/produ...placing-th400/

Last edited by Cataldo : 04-07-2015 at 08:28 PM.
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Old 04-07-2015, 08:49 PM
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Carnuck Carnuck is offline
 
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Option 3 for me. The Chev NP208 is weak due to some internal bits. Dodge is 23 spline and Jeep and Ford are on the wrong side as well as wrong spline but they are stronger.
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Old 04-08-2015, 07:19 AM
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Mr. Goatman Mr. Goatman is offline
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Nothing really wrong with any of them. The NP 203 gets a bad rep but it really is not a bad t-case. It is full time (unless converted) It is, however, really, really heavy (and big). I would also stay away from the chevy 208 due to some parts weakness but I really doubt it would be a problem. The 241 is a great case- reasonably strong and light. If it were me, I'd go with the 205. It seems that availability and price are highly variable depending on location, timing, and luck. There are several places that can adapt the "racetrack" to a round pattern as the "native" round ones are a little uncommon to find and generally fetch a fairly high price. In the end I decided to use a 47RH tranny with a dodge 205.
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Old 04-08-2015, 12:54 PM
Cataldo Cataldo is offline
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OK, makes good sense. I had figured much the same.

What about the strength of a part time Quadratrac? how does it compare strength wise to a NP241c? Physically setting either one up is pretty easy, will the chain last significantly longer in the NP241c? I have been running NP231's in a couple of Jeeps and you get pretty used to swapping chains in them, but they are much smaller than either the NP241c or Q/T, and in much lighter vehicles. I would imagine either would be viable options though.
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Old 04-08-2015, 01:17 PM
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Mr. Goatman Mr. Goatman is offline
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There is a machine shop guy that makes the shafts and ring to convert. Search for box4rocks over on Pirate to find him..... well, here it is. He can be a bit hard to get in contact with.

http://www.pirate4x4.com/forum/motor...cks-499-a.html
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Old 04-09-2015, 09:39 AM
Cataldo Cataldo is offline
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Quote:
Originally Posted by Mr. Goatman
There is a machine shop guy that makes the shafts and ring to convert. Search for box4rocks over on Pirate to find him..... well, here it is. He can be a bit hard to get in contact with.

http://www.pirate4x4.com/forum/motor...cks-499-a.html

Thanks for the link!
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Old 04-23-2015, 04:18 PM
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Retro93 Retro93 is offline
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Quote:
Originally Posted by Cataldo
OK, makes good sense. I had figured much the same.

What about the strength of a part time Quadratrac? how does it compare strength wise to a NP241c? Physically setting either one up is pretty easy, will the chain last significantly longer in the NP241c? I have been running NP231's in a couple of Jeeps and you get pretty used to swapping chains in them, but they are much smaller than either the NP241c or Q/T, and in much lighter vehicles. I would imagine either would be viable options though.
The Quadratrac is a great case, and is pretty strong as long as the chain is in good shape. You already have the -700r4 and Quadratrac adapter. so you are already ahead of the game.
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