NP205 driveshaft

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Oct 12, 2005 | 10:57 PM

Icicle

Thread Starter

Postmaster

Joined: Mar 2003

Posts: 4,038

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From: Spokane WA

NP205 driveshaft

Went and looked at a 76 F250 today with an NP205....

Only thing wrong with said truck is that the transfer case shifter is disconnected, and the driveshaft for the tcase to the front axle is spinning, but a lot slower than it should be for the speed of the vehicle, as in at 20 MPH you can count the RPMS of that shaft yourself as the truck goes by

The price is right regardless, should we just plan on pulling a tcase for a rebuild when it comes home/if it comes home?

anyone have any thoughts?

Oct 13, 2005 | 03:40 PM

armikk

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Joined: Jul 2003

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We have a 76 that does the same thing. Do you know if the transfer case / lockouts / front axle / 4wd work properly? If I were you I'd try a couple of things to see if things are acting as they should though. With the hubs unlocked, I'd put the tranny in gear and put the TC in neutral, you should be able to spin the front drive shaft by hand. Then try locking the hubs, if both lockouts are working properly you shouldn't be able to turn the driveshaft anymore.

As far as why the front driveshaft turns for apparently no reason and at a slower rate, I'd guess harmless mechanical friction between gears or the movement of gear lube itself causing it to rotate. Either way, if everything else checks out, I wouldn't worry about the slow spinning front driveshaft while in 2wd...

Oct 13, 2005 | 03:58 PM

Icicle

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Joined: Mar 2003

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From: Spokane WA

No, I had a white FTE northwest chapter tshirt on and didnt wanna ruin it crawling around anymore than I had....

I figured for the price and the way everything else checked out, it wasnt that big of a deal if one of those items needed to be replaced....

I cant imagine how someone could destroy an NP205 ...... that would take talent.

The shifter for the TC was not hooked up, it was there but the lever was removed off the side of the transfer case.

Oct 13, 2005 | 08:35 PM

Briansshop

Fleet Mechanic

Joined: Aug 2005

Posts: 1,277

Likes: 89

From: MD

Icicle,I'm think when the shifter is off of a 205 there is nothing to keep you from
being in 4hi for the rear shaft and low range for the front.

Oct 13, 2005 | 09:57 PM

Mark-I6

Senior User

Joined: May 2005

Posts: 416

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From: Federal Way, WA.

the truck that icicle is talking about is one that we went and looked at

"The price is right regardless, should we just plan on pulling a tcase for a rebuild when it comes home/if it comes home?"

it is coming home an friday as soon as i get off work

these are good ideas, i will try them when i get home with it, thanks

Oct 13, 2005 | 10:35 PM

plowpusher

Posting Guru

Joined: Sep 2003

Posts: 1,192

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From: lino lakes, mn

oil drag go under the truck grab the drive swhaft can you spin it it's in 2 wd and the hubs are unlocked it just the gear oil spinnig the unloaded gears nothing to worry about usually once the gear oil heats up its not thick enuff to spin the front shaft and no it canot be in low range front and high rear one shift shaft work hi/lo the other works in/out on the front drive shaft