the limits of the 8.25

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Shark
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the limits of the 8.25

Post by Shark »

hey guys, ive been away for a while cause my hot rod project has been receiving more attention than my jeeps lately but i have a question that i thought you guys might be best to ask.

my Model A will be receiving a 460 ford big block and i was going to get a 9 inch rear to handle the power. however, im building this thing on a tight budget and i have an old chryco 8.25 sitting in the back yard.

how much power can that thing handle? should i give it a try? if i break an axle i can always get the 9 inch later. will it be dangerous?

thanx in advance.
'91 MJ 4.0 ax15 Resto-mod street truck project, stroker candidate
'93 XJ 2door 4.0 aw4 np231 7" lift 33's
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Re: the limits of the 8.25

Post by yuppiexj »

I personally would run the 8.25, if it's going to fail, it will snap a shaft or blow the spider gears.

Either way no parts will go flying out, it just won't go anymore.
Being a c clip axle you should get a rollback to take it home.
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Re: the limits of the 8.25

Post by John »

What year 8.25, pre 97 had smaller spline count, made the unit a little stronger than a Dana 35 after 97 with increase in count of the axle splines it is closer to the Dana 44 but a little weaker overall. If you have the newer, behind a 460 you might try it as you already have it at hand, I don't think I could advise you to use the older design behind a 460.
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Re: the limits of the 8.25

Post by yuppiexj »

John wrote:What year 8.25, pre 97 had smaller spline count, made the unit a little stronger than a Dana 35 after 97 with increase in count of the axle splines it is closer to the Dana 44 but a little weaker overall. If you have the newer, behind a 460 you might try it as you already have it at hand, I don't think I could advise you to use the older design behind a 460.
John
I forgot about the 27/29 spline change.
TurboTom wrote:i will eat my words later if need be.
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Re: the limits of the 8.25

Post by Mgardiner1 »

If i'm blowing spider gears on a Dana 35 with a stroked, 282 CID inline six, and the 8.25 is only marginally stronger..... I'm sure it won't last long at all.
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Re: the limits of the 8.25

Post by SilverXJ »

The 27 spline is only marginal stronger. The 29 spline is quite a bit stronger.
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Re: the limits of the 8.25

Post by Mgardiner1 »

SilverXJ wrote:The 27 spline is only marginal stronger. The 29 spline is quite a bit stronger.
27 spline was compared to Dana 35
29 spline was compared to being almost as good as a Dana 44

a Dana 44 is still not a good option for 460 CID IMHO

Ford 9" is the real deal
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Re: the limits of the 8.25

Post by yuppiexj »

I would say for true abuse D60 or 8 3/4 are the way to go.
TurboTom wrote:i will eat my words later if need be.
TurboTom wrote: Not sure of your rules...but you need to start with an engine that works best for the rules and cheat from there!
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Re: the limits of the 8.25

Post by Shark »

this 8.25 is from a '95 so it doesnt have the increased spline count. i wont have lost anything if i break it. how long do you think it would last? i think traction might be a problem so that might help releave some of the torsion on breakable parts. this car will only weigh around 2000lbs and most of the weight will be in the block.
'91 MJ 4.0 ax15 Resto-mod street truck project, stroker candidate
'93 XJ 2door 4.0 aw4 np231 7" lift 33's
'95 XJ 4door 4.0 aw4 2" 31's
'95 XJ 4door 4.0 aw4 np231 4" lift 31's RIP
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Re: the limits of the 8.25

Post by Mgardiner1 »

LOL if you keep doing one-wheel-peel's then it may hold up for lil bit. 2k lbs is pretty light. I bet the first time the car hooks up on a launch, it grenades the spider gears
oletshot wrote:....and silvolites are only cast not hypericantspellits. :-)
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Re: the limits of the 8.25

Post by yuppiexj »

Mgardiner1 wrote:LOL if you keep doing one-wheel-peel's then it may hold up for lil bit. 2k lbs is pretty light. I bet the first time the car hooks up on a launch, it grenades the spider gears
Then it's time for a "Lincoln locker"

I wish I had the time to assemble the spare XJ drive train into a buggy, rat rod, or some other crazy fun nonsense like that
TurboTom wrote:i will eat my words later if need be.
TurboTom wrote: Not sure of your rules...but you need to start with an engine that works best for the rules and cheat from there!
Proud owner of many stroker parts, that have not yet spontaneously assembled themselves.
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Re: the limits of the 8.25

Post by Mgardiner1 »

LOL Yes that sure would be fun :-)
oletshot wrote:....and silvolites are only cast not hypericantspellits. :-)
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Re: the limits of the 8.25

Post by John »

Sounds like you will be changing rears twice, I am not as concerned with spider or side gears as I am with the shafts.
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Re: the limits of the 8.25

Post by Mgardiner1 »

I think it holds true in almost any axle, but the spider and cross shaft generally tend to be smaller then the shaft of the axle. i dunno. It seems more common that people break axle shafts. Yet i blew apart the differential assembly, and both shafts are fine
oletshot wrote:....and silvolites are only cast not hypericantspellits. :-)
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Re: the limits of the 8.25

Post by John »

You get housing flex for free with a 35.................
John
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