8.75 rear axle adjuster settings? - Hot Rod Forum : Hotrodders Bulletin Board
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Old 09-08-2012, 02:51 PM
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8.75 axle settings

just put my 67 8.75 rear together and not sure of what to set the passenger side axle adjuster at , i have found several different answeres that ranged from 3 to 23 and i set mine at 17 , the rear isnt in the car yet so if i need to adjust it tighter or looser i can do it easily Any help on this would be greatly appriciated. I have 4.10 gears in it and dont want to have it set wrong and have to replace parts because of a simple adjustment that was done wrong. thanks in advance

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Old 09-08-2012, 03:01 PM
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8.75 rear axle adjuster settings?

i just re built my rear . Its an 8.75 out of a 67 belvedere 11 , it now has a 489 case & 4.10 gears with locker . i need to find out what the axle adjuster is supposed to be set at (passenger axle ) i have found different adjustments ranging from 3 to 28 so i set mine at 17 backlash . am i wright or do i need to change it , can anybody help me with the propper backlash ? thanks in advance
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Old 09-08-2012, 06:17 PM
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ramman1500... you posted 2 questions on same subject in different thread.

one thread many years old, one new thread.

I have gathered up your questions here in one thread.

thanks...
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Old 09-08-2012, 08:09 PM
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Backlash has to be arrived at as well as preload on the side bearings.
You have to get the preload set first , then move the side adjusters the same amount each time you adjust, to get to the proper backlash.That way you maintain the preload amount as you move the carrier left or right to get the backlash set.
I assume you used the pinion depth tool to set the pinion up , as that needs done first.
Also the pinion should not be in when determining carrier side bearing preload, but obviously needs to be in when setting backlash.
Once you get the side bearing preload, back one adjuster off, ( count the notches for reference ) to make it easy to drop in the carrier. then with the carrier back in, retighten the adjuster to the spot that you have referenced for the proper preload, then move the adjusters equally left or right to get your lash
I hope this makes sense. I havent set one of those up in years.
Big Gear Head is good at diffs and may have some tips as well.
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Old 09-08-2012, 10:02 PM
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I think he is actually asking about setting the axle bearing preload instead of the differential bearing preload. The 8 3/4 Chrysler rear end has one axle that bolts in just like a 9 inch Ford. The other axle has a spanner on it and you tighten it to set the preload on both axle bearings. There is a floating block in the center of the differential that both axles bottom on so that they push against each other. I've set up quite a few 8 3/4 chunks, but I never installed the axles. Seems kind of strange that no one ever brought me their car to have the gears changed. They only brought the chunk.
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Old 09-10-2012, 09:54 AM
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I use .010 to .015 for axle end play and usually shoot for the .010.
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