Question about 1992 GMC Sonoma
It's probably your transfer case. If not used very often, they tend to seize up. If used alot, may be in need of replacement or oil needs replacing. I believe they take about 1.5-2L of auto trans fluid. Check the fluid level first, by removing the fill plug (big plug at top) and sticking your baby finger in and bending it down. If it's full, the fluid level will be right at the bottom of the plug.
It it's not, try adding some until it starts to run out of the hole, then replace to the plug.
To change the fluid, remove the fill plug first, then the drain plug and let it drain. Replace the bottom plug, fill (like discribed above) then re-install the top plug.
Always remove filler plug (top) first, then drain plug (bottom) because they can be a real bugger to remove and if you remove the bottom one and can't remove the top plug, you're screwed.
Check and add fluid if necessary, then try to shift gears before going through all of the other stuff because low fluid level can cause your problem but check on the right type of fluid first. Adding the wrong fluid can cause expensive problems. A fluid change would be beneficial, especially if you off-road because you'll get water in the oil and it does damage after awhile.
Posted on Apr 12, 2009
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Posted on Jan 02, 2017
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Feb 07, 2015 | Cars & Trucks
Transfer Case Description and Operation in Transfer Case - NVG 246-NP8
Transfer Case Description and Operation in Transfer Case - NVG 261-NP2
Transfer Case Description and Operation in Transfer Case - NVG 263-NP1
The NVG 246 EAU provides 5 modes, Auto 4WD, 4HI, 4LO, 2HI and Neutral.
The four manual mode, or range gear positions, of the NVG 261 transfer case are:
2HI - 2 wheel drive high range
4HI - 4 wheel drive high range, part-time
4LO - 4 wheel drive low range, 2.72:1 gear ratio reduction
N - Neutral, 4 wheel
The NVG 263 transfer case provides the driver with 4 manual mode/gear positions:
2HI - 2 Wheel Drive high range
4HI - 4 Wheel Drive high range
4LO - 4 Wheel Drive low range
With the info I've given you ,you should be able too now !
There is probably a code stored somewhere !
DTC B0790 DTC B2725 DTC C0300 DTC C0305 DTC C0306 DTC C0321 DTC C0327 DTC C0359 DTC C0374 DTC C0379 DTC C0550.
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