School me on the 8.25
#606622
02/07/10 01:05 AM
02/07/10 01:05 AM
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Joined: Jan 2009
Posts: 374 CONNECTICUT
RoyceFlo73
OP
enthusiast
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OP
enthusiast
Joined: Jan 2009
Posts: 374
CONNECTICUT
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Alright, So i know plymouth introduced it in 69 from what i've read. Apparently they have made their way under everything from a-bodies to trucks, to Jeeps and remained fairly unchanged till 96. Although there are some different bearing sizes and small variations in casting.
I've also noticed that the sping perches can be very different between model cars, however the differential is still internally the same.
Then it was upgraded with 29 spline axles. Also called the 8 3/8 it has a different carrier, axles, and bearings. I've also read that there are different carries for the gears. However, i have read different things regarding the split. I have heard its a different carrier from 2.56 up and 2.4# down. Is this correct?
What are the exact differences in carriers between the gear split? I know it has something to do with the height (if stood upright) of the ring gear flange. Does anyone have anymore insight into the difference as well as exact measurments?
I have a couple cone style LSD carriers for the 8.25 but which fits the smaller gears. I'm curious as to if the ring flange is the only thing stopping me from running larger gears in it.
If that's the only difference then why not just use a gear spacer like in any other differential? Lastly, if the gear spacer is unavailable then I will make one. We run a machine shop and operate wire EDM. I would think that a 4140 tool steel would be strong enough to work as a spacer. Are the ring gear bolt threads on a GM 8.25 the same as on a Mopar 8.25. If they are, i know that non-oem bolt lengths are available through summit.
Any input and schooling here would be MUCH appreciated. I'm looking for ANY information no matter how novel or technical. The web is swamped with 8.75 and I can't find any decent info on the 8.25. I found a few XJ jeep sites with some decent information, but not really any breakdowns between years and models.
I know this was a large post, and thanks for reading. Thanks even more in advance for any input!
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Re: School me on the 8.25
[Re: Moparzrule]
#606624
02/07/10 11:27 AM
02/07/10 11:27 AM
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Joined: Jan 2003
Posts: 4,323 NY NY
340duster340
master
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master
Joined: Jan 2003
Posts: 4,323
NY NY
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there is limited info for a reason. put a 9 inch or a 8.75 in your car and you'll be better off.
dont get me wrong 8.25 is a good rear, but if your going to put any power through it or run slicks dont waste your time or money.
for a daily driver these rears are great because they offer the large bolt pattern and they accept drum brake backing plates from pretty much any mopar other rear with the same bolt pattern.
your going to want to look out for limited gear ratios with the 8.25 rear
1966 Dart GT
...down to only 1 mopar for the first time in 15 years!
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Re: School me on the 8.25
[Re: DJVCuda]
#606633
02/12/10 11:59 PM
02/12/10 11:59 PM
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Joined: Dec 2003
Posts: 5,314 Carstairs, Alberta, Canada
dave571
master
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master
Joined: Dec 2003
Posts: 5,314
Carstairs, Alberta, Canada
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Quote:
lookup doctor diff - he has alot of information on them
I am running one for 15 years, 17,000 miles and 12.56 @108 with slicks - 1.74 60' times - never had a problem with mine!
They aren't a bad diff, I'll give you that. But really you won't have a problem till it spits out it's gut's on the line
I broke one in a van with a 300 hp 400BB. Side gears failed. In the 8.25's defense, the van was heavy, 5500 pounds. AND the 8.25 lasted longer the 727 in front of it did.
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