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Old 12-11-2007, 07:50 PM   #1 (permalink)
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203 or 205?

Since I'm cutting the hell out of my M38, I've decided to rip out the old pepper grinder (my kids burn the clutch anyways) and throw in a TH350 and either a 205 or 203. Any thoughts? I can't remember what the low is in a 203.
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Old 12-12-2007, 05:57 AM   #2 (permalink)
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Why in the world would you want to put a 203 in a vehicle?
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Old 12-12-2007, 06:34 AM   #3 (permalink)
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Space wise I would use the 205--the 203 is longer and 2 to 1 vs 1.94 to 1 I believe
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Old 12-12-2007, 08:22 AM   #4 (permalink)
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do a little research on the 203...to say they are undesireable would be an understatement
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Old 12-12-2007, 08:40 AM   #5 (permalink)
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Yep, that's what I thought. My neighbor is trying to sell me on using a 203 (he's a 4-runner guy). I haven't messed with one for nearly 20 years and all I remember is that they're too heavy for their lack of strength. He's telling me they're geared lower than the 205.
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Old 12-12-2007, 10:04 AM   #6 (permalink)
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Sounds like your buddy is trying to fuck you. Nobody likes buddy fuckers either.
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Old 12-12-2007, 10:52 AM   #7 (permalink)
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use both....doubla
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Old 12-12-2007, 06:34 PM   #8 (permalink)
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go with the 205 then later down the road go with the double or the lomax 205 diy kit (3 to 1)
or do what i did.... BOTH!!!

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Old 12-13-2007, 08:26 PM   #9 (permalink)
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203 is junk. unless ur just useing the range box for a doubler. 205 is all gear drive, 203 uses a double row chain in a thin alum. case. very weak. the only draw back to a 205 is the 1.96:1 low range but there is help for this to. the 205 is consided to be the strongest stock case ever.
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Old 12-16-2007, 11:45 PM   #10 (permalink)
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Well, here we go. I drove the Jeep into the shop yesterday and by midnight (and a half-gallon of Jim Beam) it was nothing but a frame, engine and front axle . I bought a TH350/205 today and boxed half the frame (ran out of steel). Also, the AFB is for sale. I'm going TBI.
New question; I'm thinking about sticking a parking brake on the back of the 205. Does anyone know of a cheap kit or should I find a rotor/caliper from a pinto or something and do it myself (and does anyone have advice on a small rotor that has worked for them)?
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Old 12-17-2007, 05:43 AM   #11 (permalink)
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Originally Posted by wyocrawler View Post
203 is junk. unless ur just useing the range box for a doubler. 205 is all gear drive, 203 uses a double row chain in a thin alum. case. very weak. the only draw back to a 205 is the 1.96:1 low range but there is help for this to. the 205 is consided to be the strongest stock case ever.

Where the hell do you guys get your info?
I'd really like to see that one with a "thin aluminum case". I've seen a bunch of them, and every one I have ever seen had a big honking cast iron case enclosing the chain. Some I've seen had a cast iron differential housing, and most had an aluminum differential housing. I've never heard of either being weak.

There are not any problems with case strength, or chain strength. The real weakness of an NP203 are it's size/weight, and the fact that there is a differential connecting the front and rear drivelines. If you are open on either end, then you end up with a 1 wheel drive vehicle.
A pic, for those of you like wyocrawler, who apparently has never seen a 203.


In any case, You should use the 205, and not even consider the 203. I'm just including this info, so you have the right reasons for not considering the 203, and so that somewhere down the road, you repeat the facts, rather that the BS that some around here parrot.



If you are going to go to the trouble of repeating what you've heard, you should at least do a little bit of research so you don't come off as a know it all who doesn't know anything. This is supposed to be Pirate4X4, Not Parrot4X4.

Doug
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Old 12-17-2007, 07:31 AM   #12 (permalink)
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Well, there ya go.

Really, It came down to a size issue. I didn't want to take the rear axle back more than 4". I think I'll have to go 6". The front axle will go forward 10". Everyone says "just move the engine forward", but I want the balance of a set-back engine. My wheelbase will be 98" if I can get away with moving the rear 4".
BTW- we're getting pounded by rain here in WA and the mud is better than ever. I'll try to get the pix of the bog in our pasture. It ate a couple trucks yesterday (both Fords).
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Old 12-17-2007, 12:20 PM   #13 (permalink)
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Quote:
Originally Posted by Cowchip500 View Post
Yep, that's what I thought. My neighbor is trying to sell me on using a 203 (he's a 4-runner guy). I haven't messed with one for nearly 20 years and all I remember is that they're too heavy for their lack of strength. He's telling me they're geared lower than the 205.
The 203 is like 1.96:1 and the 205 is 1.94:1, or something around their. It;s lower, but by a few hundreths... nothing you will be able to notice while driving. The 205 would be a better option, or do a doubler as the others said, depending on how low you'd like to gear it.
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Old 12-18-2007, 01:13 PM   #14 (permalink)
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[QUOTE=dahoyle;7621302]Where the hell do you guys get your info?
I'd really like to see that one with a "thin aluminum case". I've seen a bunch of them, and every one I have ever seen had a big honking cast iron case enclosing the chain. Some I've seen had a cast iron differential housing, and most had an aluminum differential housing. I've never heard of either being weak.

man I don't know about you but the last 203 I took down to build a doubler it had a cast iron range box, aluminum case and diff housing. + they are still weak junk.
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Old 12-18-2007, 04:55 PM   #15 (permalink)
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Originally Posted by wyocrawler View Post

man I don't know about you but the last 203 I took down to build a doubler it had a cast iron range box, aluminum case and diff housing. + they are still weak junk.

Really, I'd like to see some pics of said housing, because I can go lay my hands on at least a dozen tomorrow, and every one of them has a cast iron case. One, from a Dodge, has a cast iron dif housing, but all the Ford and Chevy ones have the aluminum dif housing. I'm not going to get in a pissing match over strength, either. They are have the same weaknesses as any other chain driven case, but as a whole, they are pretty damn stout. For the record, they do not have a double roller chain. It does, however, use a Morse type chain, along with every other T-case manufacturer that I'm aware of.

Not going to say that you are lying about the 203 case material. You may have the extremely rare aluminum one, but the rest of your info is out to lunch. Like I said, would really like to see a pic of this aluminum one.

All in all, they are still quite un-desirable, for 4 wheeling, but the main reasons are just as I stated. You are the only person I've ever heard say they were weak, and I have my doubts that you have ever ran one, much less broke one. If you care to retort, please have a bit more information available the next time.
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Old 12-19-2007, 11:23 PM   #16 (permalink)
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damm I feel like an ass. ur right I checked the junk pile and the chain case is cast. my bad. I did run a 203 years ago and did blow it up. as I remember it was the front output shaft that gave up. but this was about 10 years ago. and my mind is going in my old age.
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