ADD reverse question
#1
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ADD reverse question
i was wondering if you have an ADD diff is there anyway to prevent it from unlocking when you go into reverse? is there an electrical circuit i could redo so the acuator put suction on the lock side other then the unlock side when in reverse?
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#10
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The sleeve is vacuum actuated, locks with vacuum and unlocks with vacuum:
- http://www.off-road.com/trucks-4x4/t...tem-19259.html
Might be thinking about the situation where you are in 4WD on a high traction surface (binding up the drive train) and then try and shift to 2WD. Due to the binding, the sleeve may not unlock right away, but it eventually will once the binding is relieved, like what you shift to reverse and back up a little.
- http://www.off-road.com/trucks-4x4/t...tem-19259.html
Might be thinking about the situation where you are in 4WD on a high traction surface (binding up the drive train) and then try and shift to 2WD. Due to the binding, the sleeve may not unlock right away, but it eventually will once the binding is relieved, like what you shift to reverse and back up a little.
#12
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Im sure they stayed locked. What you probably noticed was that one tire was spinning and the other one wasnt and this is due to having open diffs. So your 4wd isnt exactly 4wd without a locker
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no i havent even takin the truck offroad(dont have a license) but since i have the motor out and room to work with i was wondering if there was a way to do that but it appears that its not an issue to begin with.
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Auto-hubs unlock when you reverse.
Automatic Differential Disconnect (A.D.D.) does not.
Auto hubs were an option on trucks from '84-'88 and 4runners from '84-'89.
'89-'95.5 trucks had manual hubs or ADD. '90+ 4runners had ADD only.
Automatic Differential Disconnect (A.D.D.) does not.
Auto hubs were an option on trucks from '84-'88 and 4runners from '84-'89.
'89-'95.5 trucks had manual hubs or ADD. '90+ 4runners had ADD only.
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Hey this is the closest thing I could find to my problem. I rebuilt my passenger side hub recently and when I tested everything out after re-installing, everything worked except 4wd reverse, any ideas why? Reverse worked 2wd, and 2wd with the hubs locked, just not with the power to the front wheels. When I try to reverse it starts to feel tight and bound up like the tire isn't rotating. Could it be I just didn't re-install the hub properly? I notice this hasn't been active for a while, but just didn't want to start a new thread with out checking here first.
#17
everyone says the auto hubs unlock in reverse but my 87 never seems too. I have been stuck a few times and all 4 spin in reverse. Im still getting manual ones though...just havent had the time to fight the cone washers on my parts truck.
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everyone says the auto hubs unlock in reverse but my 87 never seems too. I have been stuck a few times and all 4 spin in reverse. Im still getting manual ones though...just havent had the time to fight the cone washers on my parts truck.
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if im not mistaken the sleeve disconnects after like a 1/4 rotation in reverse
The way it works, its not rotation specific, it doesnt know weather its going forward or backward. Its just a mechanical coupler. However its possible for an electrical malfunction to take place involving the reverse sensor and the 4wd's electronic components, making it shift out of 4wd when its in reverse, but thats a different issue altogether.
Last edited by ThatGuy1295; 10-09-2012 at 08:24 PM.
#19
They unlock in reverse then re-lock. They unlock with a change in direction momentarily nobody is saying you dont have 4wd in reverse. Its just not as good as locked hubs cause theres a delay in 4wd engagement between forward and reverse, just enough to use it as an excuss why you got stuck. And unless you have lockers then all 4 dont always spin, sorry its impossible to have 50/50 traction all the time.
Last edited by iliketoyota; 10-09-2012 at 09:37 PM.
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