Stuck in 4wd HI; goes 4HI/4LO ok, won't go to 2wd HI
#1
Stuck in 4wd HI; goes 4HI/4LO ok, won't go to 2wd HI
1998 Blazer ZR2, Stuck in 4wd HI; goes 4HI/4LO ok, won't go to 2wd HI. I can switch from 4HI to 4LO to 4HI all day, but it won't go into 2HI.
I pulled the battery and tray out and found the diaphragm sucked in, pulling the cable. But the cable was rusted through the outer jacket and totally frozen. So I managed to remove the cable from the diaphragm and transfer case, put in a new cable, verified it was pulling/pushing the actuator in the transfer case. Then I hooked it back up to the diaphragm, put the vacuum line back on the diaphragm, but it still stuck in 4wd. The diaphragm was sucked in (collapsed) when I checked again, so I removed the vacuum line, allowing the diaphragm to expand and release the cable, thinking that's what was holding it in 4wd. NOPE.
Check the 4wd fuse - that was ok.
When I try and put it into 2HI, there are 3 clunking noises coming from the transfer case, like it tries 3x to go into 2HI but never does.
I pulled the battery and tray out and found the diaphragm sucked in, pulling the cable. But the cable was rusted through the outer jacket and totally frozen. So I managed to remove the cable from the diaphragm and transfer case, put in a new cable, verified it was pulling/pushing the actuator in the transfer case. Then I hooked it back up to the diaphragm, put the vacuum line back on the diaphragm, but it still stuck in 4wd. The diaphragm was sucked in (collapsed) when I checked again, so I removed the vacuum line, allowing the diaphragm to expand and release the cable, thinking that's what was holding it in 4wd. NOPE.
Check the 4wd fuse - that was ok.
When I try and put it into 2HI, there are 3 clunking noises coming from the transfer case, like it tries 3x to go into 2HI but never does.
#2
My uncle's truck had nearly the same problem and it turned out to be some missing teeth in the encoder motor that wouldn't allow for a shift back to 2HI. I posted pictures of the gears inside the encoder motor in another thread a while back. You should be able to find them.
#3
Is the encoder motor connected to the cable that goes up to the diaphragm?
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