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Used NP205 question...

zj4play

zj4play

1/2 ton status
Joined
Oct 10, 2008
Posts
279
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Location
orange county
So I am picking up an NP205 later this week that is coming out of a 1978 Chevy pickup, he is parting it out. Question is, before I install it into my blazer, anything I should do to it while its out and easy to work on? Besides clean it up? Is it worth it to twin stick it? Thanks
 
i would twin stick it and do a gasket kit. too easy not to do one.

also its a good time to do the adapter seals if you got em.
 
maybe just replace some seals. I didnt and mine leaks so now I have to pull it out again. I twin sticked mine, and it did come in handy out on the bullfrog trail. I would hit up JB custom fab, he did mine custom and he ships fast. http://www.jbfab.net/index.html
And for all the people that say you can put it in rear wheel low, you can do that not twin sticked, just dont lock the front hubs :D
 
are you replacing an existing 205 with this 78' one? Are they the same input spline count, and figure 8 pattern?
 
76zimmer said:
are you replacing an existing 205 with this 78' one? Are they the same input spline count, and figure 8 pattern?
Click to expand...

No, I am taking out a TH350 and NP203. Replacing it with a TH400 and the NP205 I am getting. Was thinking about doing the divorced transfer case behind the TH400 because its a 2x unit. If I don't go that route, then I will have to get the adapter but that is pretty expensive.

What are the advantages of doing the twin stick? I have just heard about it, not done any research on it yet.
 
zj4play said:
No, I am taking out a TH350 and NP203. Replacing it with a TH400 and the NP205 I am getting. Was thinking about doing the divorced transfer case behind the TH400 because its a 2x unit. If I don't go that route, then I will have to get the adapter but that is pretty expensive.

What are the advantages of doing the twin stick? I have just heard about it, not done any research on it yet.
Click to expand...

If you dont divorce it, you will have to make sure your TH400 output, and 205 input are compatible, and you may need new driveshafts, as the 350/203 combo could be longer than the 400/205 combo, depending on which adapter you use, and 205 adapter pattern.

Twin sticking allows more precise control of shifting the different rails in the case.....the factory setup is made to not engage the front axle until the box is in 4WD.
 
zj4play said:
No, I am taking out a TH350 and NP203. Replacing it with a TH400 and the NP205 I am getting. Was thinking about doing the divorced transfer case behind the TH400 because its a 2x unit. If I don't go that route, then I will have to get the adapter but that is pretty expensive.

What are the advantages of doing the twin stick? I have just heard about it, not done any research on it yet.
Click to expand...

IMO your not getting much going to the th400 and 205. I did that, and looking back now, I wish I went a different direction. The 205 has a terrible lo, and I dont think you will be hammering the crap out of it to worry about the strength of a 203 or an aluminum case tcase. Thats just my .02
 
Yobtaf said:
IMO your not getting much going to the th400 and 205. I did that, and looking back now, I wish I went a different direction. The 205 has a terrible lo, and I dont think you will be hammering the crap out of it to worry about the strength of a 203 or an aluminum case tcase. Thats just my .02
Click to expand...

Well, when the motor is done it will be pushing out around 650 HP. I was going to do a rebuild on the TH350 and keep the 203, but I have a Th400 laying around. Figured its a way stronger tranny so I should rebuild that one instead of sticking money into the weaker TH350. As long as I am doing that, then I learned its pretty hard to find the correct adapters to mate the TH400 to the 203, so I found a used 205 for $200. Yeah, the lo sucks I heard, but its a lot stronger then the 203. I would rather do it right once, then have to spend the money twice?
 
76zimmer said:
If you dont divorce it, you will have to make sure your TH400 output, and 205 input are compatible, and you may need new driveshafts, as the 350/203 combo could be longer than the 400/205 combo, depending on which adapter you use, and 205 adapter pattern.

Twin sticking allows more precise control of shifting the different rails in the case.....the factory setup is made to not engage the front axle until the box is in 4WD.
Click to expand...

Yes, I have taken the driveshaft length into consideration, thanks!

When would I need to use just the front axle in 2WD lo? This helps a bunch, thanks
 
zj4play said:
Well, when the motor is done it will be pushing out around 650 HP. I was going to do a rebuild on the TH350 and keep the 203, but I have a Th400 laying around. Figured its a way stronger tranny so I should rebuild that one instead of sticking money into the weaker TH350. As long as I am doing that, then I learned its pretty hard to find the correct adapters to mate the TH400 to the 203, so I found a used 205 for $200. Yeah, the lo sucks I heard, but its a lot stronger then the 203. I would rather do it right once, then have to spend the money twice?
Click to expand...


If your truly going to be making that kind of hp, you should do more than just a rebuild even on a TH400. A 34 element sprag, and direct drum, a manual valvebody, roller rear bearing, HD case snap ring, and 6 disc clutches should be minimum required parts for that much hp.
 
76zimmer said:
If your truly going to be making that kind of hp, you should do more than just a rebuild even on a TH400. 34 element sprag, manual valvebody, roller rear bearing, HD case snap ring, and 6 disc clutches should be minimum required parts for that much hp.
Click to expand...


Yes sir, its in the works :D
 
For sure I will get pics of everything...just waiting to post them up until its all done.
 
What motor are you building to make that much hp and i hope you have one tons and what is this truck being built for trails, drags, mud.

The reason for front low is front digs for ledges that need to broke down to make it over or turning or moving the front end of the truck and not the back.
 
Hey mnstr, the blazer will be used for mostly desert wheeling, glamis, pismo and some rocks. Looking more for usable wheeltravel than a big lift and huge tires. Like ktmoutfront and bhays My buddy is getting an 85 crew cab built with 26" front travel and 36" rear travel...I don't have that cash, but I can dream right?

1 tons? Nope, but they are in the works. I was going to do the axles and suspension first, but the motor took a dump so priorities changed. Oh well
 
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