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Old 07-14-2008, 07:32 PM   #1 (permalink)
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are all these interchangeable?

For a stock late 70s chev half ton, if i decide to install th400, np205, 14bolt front and rear, will these all bolt right up in place of the stock parts or will I need to do some fab work or purchase anything else. Thanks.
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Old 07-14-2008, 07:48 PM   #2 (permalink)
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oy.

no GM half ton 4x4 ever had a th400 as a stock transmission with an NP205 behind it.

front driveshafts will be within a foot, but probably wont fit 100% if you use the one ton stuff, as they may be a tad short in the front, and just wrong in the back.
everything else will bolt up.
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Old 07-14-2008, 08:08 PM   #3 (permalink)
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Originally Posted by Grumpy_old_fart View Post
everything else will bolt up.
Except the 14bolt front.
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Old 07-14-2008, 08:12 PM   #4 (permalink)
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also depending on what you get the 14 bolt out of you may have to move the spring perches and the shock mounts. also going to need new ubolts.
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Old 07-14-2008, 08:13 PM   #5 (permalink)
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Quote:
Originally Posted by silver98Z71 View Post
Except the 14bolt front.
D'OH!

forgot about that one... but I know SOMEONE built one.
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Old 07-14-2008, 08:15 PM   #6 (permalink)
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D'OH!

forgot about that one... but I know SOMEONE built one.
Yes sir. There is a guy down the highway from my house who has a 14bolt center with D60 outters under his '96 K3500.
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Old 07-14-2008, 10:11 PM   #7 (permalink)
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i have one too, built by lincoln machine.

wfo used to sell them rtr.


if you you got everthing from one truck then yes it will all bolt together.

if the shafts came from xx , the tcase and tranny came from xx, and the axles from xx, then you will just need to get the shafts modded.

the only obvious hang up is the 14bff from a 3/4t or a 1t? 1t will need the springs perches moved.
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Old 07-15-2008, 01:39 PM   #8 (permalink)
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the only obvious hang up is the 14bff from a 3/4t or a 1t? 1t will need the springs perches moved.
And I think some of the 3/4ton trucks had both of the shocks mounted towards the rear. But that is trivial.
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Old 07-21-2008, 05:37 PM   #9 (permalink)
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Doesnt sound too difficult to do. Im just tired of frying trannys, prolly because im running 3.73gears with 37s haha. I was told to just rebuild, get a cooler and run 4.11 gears and I wont have to worry bout another tranny for a while. One last thing, I know the 205t case was build better mainly because its gear driven and not chain, correct? Should I just stick with th350 and 203 or spend the time and money and fab up what I was talking about above?
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Old 07-21-2008, 05:41 PM   #10 (permalink)
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if you are staying with the turbo 350/203 i would say to change gears to either 4.56 or 4.88 your truck will thank you for it
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Old 07-23-2008, 07:34 PM   #11 (permalink)
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Im sure it would. Thanks for the info guys.
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