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Front is 2WD, pull directly back into the next slot, it's 4HI, push over to the right for neutral, then pull down to the back one more time from there for 4LO. That model year still used the gear driven NP205 transfer case... the chain driven NP208 wasn't introduced until 1981.

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9y ago
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Q: What is the shift pattern on 1978 gmc jimmie 4x4 transfercase?
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