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Old 10-17-2012, 10:49 PM   #1
72_GMC_Sierra_Grande
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Won't shift into 4 wheel high!

So my transfer case will not go into 4wheel high! Everything looks okay on the linkage from what I can see and it shifts into 2wheel high, 4wheel low and neutral with no problems. 4wheel high is all the way back, then 2wheel high, neutral and 4wheel low all the way up. This is on my 1969 Chevy K10 and has been this way since I got it 9 months ago. Now that winter is coming I need to get it fixed. Any ideas???
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1969 CHEVY K10 (disguised as a GMC) SWB Small Block 400/4SPD/NP205
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Old 10-21-2012, 03:45 PM   #2
72_GMC_Sierra_Grande
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Angry Re: Won't shift into 4 wheel high!

You mean to tell me that NO ONE else has encountered this problem!?
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1969 CHEVY K10 (disguised as a GMC) SWB Small Block 400/4SPD/NP205
1972 GMC 1500 Sierra Grande LWB Big Block 402/TH400 FOR SALE Make Offer - Appraised at $19,900.00 on 07/24/2012 for insurance.
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Old 10-21-2012, 03:54 PM   #3
Stocker
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Re: Won't shift into 4 wheel high!

You'd think someone would have encountered that, but I haven't. My K20 has a NP205 t-case and I guess your truck does too, b/c the shift pattern is the same. Maybe someone will jump on here....
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Old 10-21-2012, 04:00 PM   #4
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Re: Won't shift into 4 wheel high!

Spray the shifter down with WD-40? The shifter on mine gets gummed up every once in a while.
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Old 10-21-2012, 05:57 PM   #5
1969K10
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Re: Won't shift into 4 wheel high!

are the connections just old and sloppy, and you run out of shifter travel before you get in 4 HI?
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Old 10-21-2012, 06:23 PM   #6
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Thumbs up Re: Won't shift into 4 wheel high!

Quote:
Originally Posted by 1969K10 View Post
are the connections just old and sloppy, and you run out of shifter travel before you get in 4 HI?
All good thoughts and advice... Thanks! The linkage is not sloppy. I will try spraying down all the linkage with WD40 and see if that helps.

Thanks again guys! And any other thoughts/ideas would be appreciated!!!
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1969 CHEVY K10 (disguised as a GMC) SWB Small Block 400/4SPD/NP205
1972 GMC 1500 Sierra Grande LWB Big Block 402/TH400 FOR SALE Make Offer - Appraised at $19,900.00 on 07/24/2012 for insurance.
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Old 10-28-2012, 10:19 AM   #7
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Re: Won't shift into 4 wheel high!

You may have already tried this ... but here goes again.

1. Shift your trucks transmission into neutral ... not the transfer case, the transmission. Hold your foot on the brake.
2. Shut off the ignition.
3. Pull transfer case shifter all the way back, do not stop at each range.
4. Let you foot off the brake if it still won't go, and apply pressure back on shifter again. This may give enough movement in the driveline to allow it to engage.

Let us know if this works.

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Old 10-28-2012, 10:44 AM   #8
Zane M
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Re: Won't shift into 4 wheel high!

How is your fluid level in the tcase? I've seen low fluid cause this problem before.
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Old 12-18-2012, 03:58 PM   #9
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Re: Won't shift into 4 wheel high!

Did you resolve this? Im having the same issue excpet 4H is in between 2H and neutral. On my 68 K10 on the picture it shows 2H is all the way back and 4Lo is all the way forward. It could be operator error on my part but I cannot find it or 4H is broken somehow. I can get 2H and 4L no problem.
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Old 12-18-2012, 04:39 PM   #10
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Re: Won't shift into 4 wheel high!

Just played with the shifter again and it only feels like there is the three, no 4h found.
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Old 12-18-2012, 04:48 PM   #11
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Re: Won't shift into 4 wheel high!

Take a picture of the back of the transfer case and post it. Need to know what we are working with. I'm pretty experienced with a few different cases.
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Old 12-18-2012, 06:22 PM   #12
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Re: Won't shift into 4 wheel high!

I looked at pics of the np203 and 205 and this doesnt look like either. I think on top you can make out DANA.
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Old 12-18-2012, 06:24 PM   #13
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Re: Won't shift into 4 wheel high!

some times the shifter is bumping the hole in the hump i have loosened up the hump cover and moved forward and to see if the shifter was not able to go far enough ahead to engage.
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Old 12-18-2012, 07:10 PM   #14
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Re: Won't shift into 4 wheel high!

Quote:
Originally Posted by fijijason View Post
I looked at pics of the np203 and 205 and this doesnt look like either. I think on top you can make out DANA.
I'd say someone swapped in a Dana 20. Not a good transfer case for a heavy fullsize pickup...might want to go trans/transfer case shopping real soon.

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Old 12-18-2012, 07:20 PM   #15
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Re: Won't shift into 4 wheel high!

I guess I should figure out what kind of 4sp transmission I have .......
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Old 12-18-2012, 07:26 PM   #16
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Re: Won't shift into 4 wheel high!

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Originally Posted by fijijason View Post
I guess I should figure out what kind of 4sp transmission I have .......
Might be a good idea.
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Old 12-18-2012, 08:36 PM   #17
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Re: Won't shift into 4 wheel high!

found that there is a gm pattern for this tcase. Had to look a while to find it, no wonder I was having problems. Its a u shape pattern..
2H is on the left and up toward the dash
4H is down toward the seat
N is to the right and up toward the dash
4L is to the right and way up toward the dash
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Old 12-18-2012, 08:37 PM   #18
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Re: Won't shift into 4 wheel high!

and thanks redcap for the identification!!!
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Old 12-19-2012, 11:00 AM   #19
kwmech
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Re: Won't shift into 4 wheel high!

Do you have a body lift on the truck? Make sure the shifter is not hitting the floor pan when you pull it all the way back
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Old 12-28-2012, 11:28 AM   #20
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Re: Won't shift into 4 wheel high!

My '70 Blazer also has the Dana 20. Your 4spd should be a SM465. Here is your shift pattern.
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Old 01-06-2013, 09:40 PM   #21
Yerboogieman
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Re: Won't shift into 4 wheel high!

The only problem I had was shifting it OUT of 4high. I usually have to go real slow and push gently on the shifter and it will just slide out. But sometimes it'll just come out of gear.
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