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post #1 of (permalink) Old 11-02-2002, 08:14 AM
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Rules for using manual lock hubs??

I have a 1987 GMC High Sierra that came with factory auto locking hubs. The previous owner installed manual hubs to improve gas mileage. I have never owned a vehicle w/ manual hubs before and I would like to know the rules for shifting in and out of 2H, 4H and 4L...
At what speeds can I shift?
Do I need to put the tranny in N?
Do I have to drive in reverse to disengage the front wheels?
Is there anything else I should know or do??

Thanks in advance,
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post #2 of (permalink) Old 11-02-2002, 09:16 AM
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Re: Rules for using manual lock hubs??

If you are going to use 4wd you will need to lock the hubs in. It is ok to run the hubs locked if you are in 2wd and anticipate needing 4wd. With the 87 you can shift from 2hi to 4hi on the fly, if the hubs are already locked. You will have to shift to N to get into low. To unlock, just get out and move the hub. Some places say to lock the hubs in for a while to move the lube around. Don't know if this is necessary. I usually leave mine locked in.
post #3 of (permalink) Old 11-02-2002, 11:48 PM
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Re: Rules for using manual lock hubs??

Like he said if the front hubs are locked you can shift in to 4 high but only below 25mph.
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