205 transfer case speedometer

[seik5]

Looking for information on a 1971 NP 205 transfer case. This is in a 72 chevy k10. with a th350. My transfer case was just rebuilt by a friend and looks and works great with one exception. My speedometer don't work! Everything is new to to the transfer case and works fine when I spin it with a drill. This one has a steel drive gear, so it is a smooth bore 7 tooth drive gear. I really can't figure out how it works, it just spins in there? Maybe friction? also from my research it looks like maybe I am missing something in there. Some pics Show a spacer behind the speedo gear, on the output shaft. I don't have that? Any help?

[52napco]

Is the gear still on the output shaft of the 205??

[seik5]

I have removed the gear!

[jeffahart]

How have you determined it's not working. Did you bolt on and torqure the yoke and drive it? or are you spinning the output shaft by hand? I'm assuming you haven't bolted up the yoke because you took out the driven gear. Is that correct? Anyhow, Put the gear back in and torque the yoke, if you haven't already. And drive it, you should have action to the speedo. There is no spacer that I know of.

j

[seik5]

The yoke has been on and torqued. everything back together. Driving the truck --but still not working. took it back apart. spun everything thru the cable with a drill and speedo worked fine. I know it is something with the gears, but they look fine. Remember this is a 71 model Transfere case so it has metal gears and smooth bore output shaft. I have the case on the bench now with the cover off I can see the gears meshing. However the drive gear can slide inward enough to loose contact with the driven gear. Hense the spacer thought. I have since found some supporting evidence but not sure. I called torque king but the guy I got did not know anything about the metal geared t. c.

[jeffahart]

Here’s a picture of inside the housing. I just had mine off a couple weeks ago. WARNING… do not take it off. You could end up with needle bearing soup at the bottom of your transfer case.

J

[jeffahart]

Also, you should be able to see what’s going on with just the bearing retainer off

[seik5]

Yes I just took the retainer off. That part is still on the transfer case, so I have the output shaft still in place. Did you have a metal gear, or plastic when you took it apart?

[jeffahart]

OK I just looked it up for you. Looks like there’s a spacer I don’t remember one but here it is in the schematic. Number seven is the speedo gear number eight is a spacer. And yes, I have the metal gear.

J

[seik5]

Thanks a million! That is exactly what I needed to see! I may have found one locally, in an old case, if they don't want to part with it, I can get dimentions and have one made. I will post how it works out.

[Dicky1]

Hi, I’m new, just subscribed, I have a beautiful 72 Sierra Grande , I would like to pull the tranny and TCase and just do all the gaskets and seals… the transfer case just has the annoying sweating of oil here and there… is there a specific seal/gasket kit available for the 205 TC

[jeffahart]

Originally Posted by Dicky1

Hi, I’m new, just subscribed, I have a beautiful 72 Sierra Grande , I would like to pull the tranny and TCase and just do all the gaskets and seals… the transfer case just has the annoying sweating of oil here and there… is there a specific seal/gasket kit available for the 205 TC

Your easiest bet is offroad design. Do not use gasket seal, you must use the proper gaskets. The tolerances on the adapter require the proper gaskets. Plus, check your adapter for hairline cracks... especially if you have a manual trasmission with the exta long adapter. You cannot check for cracks just eyballing. You need to use ultraviolet light. Wipe it down good, then check with light. No need for leak check additive, the ultraviolet will show seepage through anycracks with regurar gear oil.

j

[Dicky1]

Ok… its all working great but I don’t like the sweat…. I see by looking the last time apart obviously there has been gasket goo of some sort on some of the cover plates for sure

[jeffahart]

Post #10 shows hiarline crack in 205 adapter

https://67-72chevytrucks.com/vboard/...d.php?t=772415



j

[jeffahart]

Originally Posted by Dicky1

Ok… its all working great but I don’t like the sweat…. I see by looking the last time apart obviously there has been gasket goo of some sort on some of the cover plates for sure

You can gasket seal the pto covers, just not the adapter mating to the Trans and 205.

j

[HO455]

Originally Posted by Dicky1

Hi, I’m new, just subscribed, I have a beautiful 72 Sierra Grande , I would like to pull the tranny and TCase and just do all the gaskets and seals… the transfer case just has the annoying sweating of oil here and there… is there a specific seal/gasket kit available for the 205 TC

Welcome aboard!
I do like 4eyed 4x4's post some photos.

[Dicky1]

Ok…makes sense yes.. off-road design ships to Cold Canada I expect ����

[Dicky1]

I’m old … I’ll try to figure out hiow to post pics lol

[Dicky1]

Uploaded 5 pictures but not sure how to post them
lol. Not onlyam I old, I only got 20 minutes of grade 9

[Dicky1]

Guess it worked after all

[HO455]

Oh that's sweet! Definitely worth the effort to post.

Here's a flip for the last two.

[Dicky1]

Thanks, ya it’s pretty nice, just a well looked after truck spent its life in Olds Ab , as far as I know I’m the 3rd owner, except for my friend who’s dad sold me a helicopter that sends stuff to barret Jackson owned it for a few months until I could get there to buy it.

[Mendo70C20]

Originally Posted by Dicky1

Uploaded 5 pictures but not sure how to post them
lol. Not onlyam I old, I only got 20 minutes of grade 9

Looks great!

[Dicky1]

Hey fellas… I got the NP 205 tore all apart except the idler gears. Shaft seems extremely tight as though I might need to press it? But I’m wondering , I’m just doing all new seals and orings etc, all the bearings, everything is in excellent condition, so they are going back in. I’m curious… is it ok to just leave idler as is ? I might be questioned on shimming ? I’m not sure but this case run quiet as a mouse, sooner not remove it, there is just the end plate gasket to replace.

[Dicky1]

Does anyone have the part # for the O-Ring on the input shaft that is inside the coupler between the trans and transfer case side ?