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Old 08-22-2010, 09:35 PM   #1
bignovamike
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Default Checking Axle housung for straightness.

Does anyone know of a place in the Chicagoland area that can check a 12 bolt rear end to see if the axle tubes are straight? They have been welded on and kind of look like they might be tweeked, I don't want to put a bunch of money into it for parts and find out it is fucked up to start with.
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Old 08-22-2010, 09:59 PM   #2
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Default Re: Checking Axle housung for straightness.

They always look somewhat tweaked after you re-weld the ends. The axle tubes naturally bend/warp a bit throughout their lifetime, and then when the ends are re-welded with a jig, they're kind of tweaked looking but actually dead straight. If the axles slide in and out easily, you shouldn't worry.

You have a PM coming your way to one of the best trans/rear-end guys on the southside(Justice)....I'm pretty sure he has a 12-bolt jig he can check the housing with.
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Old 08-22-2010, 10:07 PM   #3
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Default Re: Checking Axle housung for straightness.

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Originally Posted by b00sted View Post
They always look somewhat tweaked after you re-weld the ends. The axle tubes naturally bend/warp a bit throughout their lifetime, and then when the ends are re-welded with a jig, they're kind of tweaked looking but actually dead straight. If the axles slide in and out easily, you shouldn't worry.

You have a PM coming your way to one of the best trans/rear-end guys on the southside(Justice)....I'm pretty sure he has a 12-bolt jig he can check the housing with.
X2 if axels slide in and turn free your OK
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Old 08-23-2010, 11:41 AM   #4
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Default Re: Checking Axle housung for straightness.

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Originally Posted by 08miller View Post
X2 if axels slide in and turn free your OK
They may turn free, but depending on the slop in the splines, you might not see how bad the housing actually is. It can get you a close guesstimation.
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Old 08-23-2010, 12:34 PM   #5
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Default Re: Checking Axle housung for straightness.

Get two straight pieces of steel about 2 feet long. Clamp them to the housing end so that center of the straight edge is at the axle centerline. Do this on both sides,then measure the width at the ends of the straight edge. They should be pretty close. This will tell you if the tubes are bent forward or back. Think of it like measuring toe-in. Then tip the housing so the pinion points straight up,and turn your straight edges 90 and measure again. This will tell you if the tubes are bent up or down. I don't have a spec that will tell you how much variance is too much-maybe someone else can chime in. If they are relatively close and the axle slides in easily,you are probably fine. Keep the measurements somewhere so that if you ever need to check it again,you will have something to compare to.
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Old 08-23-2010, 09:19 PM   #6
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Default Re: Checking Axle housung for straightness.

Should I be worried?
I just reassembled my 9" with a new Strange center sec and new axels. The driver side axel slid in easy but the passenger side we had to do some "gentle" persuasion, pulling the axel in one direction, to get it slide in. Everything spins good, as far as I can tell.
I ain't about to trash a new center sec and axles am I?
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Old 08-23-2010, 09:29 PM   #7
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Default Re: Checking Axle housung for straightness.

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Originally Posted by bignovamike View Post
Does anyone know of a place in the Chicagoland area that can check a 12 bolt rear end to see if the axle tubes are straight? They have been welded on and kind of look like they might be tweeked, I don't want to put a bunch of money into it for parts and find out it is fucked up to start with.
I've got an alignment jig and I live just south of route 66 if your interested in getting it checked out.
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Old 08-23-2010, 09:30 PM   #8
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Default Re: Checking Axle housung for straightness.

FYI, I just had a new Moser housing checked and it not straight on the drivers side.I had to use a BFH and a piece of wood to get the axle out.
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Old 08-24-2010, 10:12 AM   #9
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Default Re: Checking Axle housung for straightness.

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Originally Posted by mkz/28 View Post
Should I be worried?
I just reassembled my 9" with a new Strange center sec and new axels. The driver side axel slid in easy but the passenger side we had to do some "gentle" persuasion, pulling the axel in one direction, to get it slide in. Everything spins good, as far as I can tell.
I ain't about to trash a new center sec and axles am I?
Being new parts, the splines might be a bit tight fit. Added a slightly bent tube will aggrevate the issue. I'd have the housing checked.

After you get the splines started, how did the bearing line up with the tube? Sometimes you can tell if it's bad that way(for a close guesstimate anyway).
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Old 08-24-2010, 07:44 PM   #10
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Default Re: Checking Axle housung for straightness.

Once the bearing got to the axel flange after sliding it in it seemed to be off mabey a 1/4in. Everything spins easy enough, don't seem to bind up or anything.
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Old 08-24-2010, 10:14 PM   #11
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Default Re: Checking Axle housung for straightness.

a 1/4 is way to much pull it apart and have it checked I like to let the housing cool down with the jig installed I have seen some places use the jig and tack in the ends then pull it and weld it fully the ends and tubes can move all around that way
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Old 08-24-2010, 11:40 PM   #12
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Default Re: Checking Axle housung for straightness.

Quote:
Originally Posted by mkz/28 View Post
Once the bearing got to the axel flange after sliding it in it seemed to be off mabey a 1/4in. Everything spins easy enough, don't seem to bind up or anything.

If you engage the spline and slide it in until the bearing hits the housing end and its a 1/4" off thats quite a bit. Get it checked. I do my own rears. I had a piece of 1 1/2" TG&P shaft, machined a couple of aluminum 'pucks' and wala, instant jig.

1/4" off can be overcome by forcing the axle bearing in by taking up the slop in the spline, problem is your asking the engagement between the axle spline and the center to act as somewhat of a universal joint.
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Old 08-25-2010, 12:23 AM   #13
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Default Re: Checking Axle housung for straightness.

buy a round bar,
two rings that fit in the bearing ends of housing
two rings that fit into the center section bearing saddles.

test it yourself....!!!
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Old 08-25-2010, 12:25 AM   #14
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Default Re: Checking Axle housung for straightness.

dont forget that some makers of internal splines for center sections ( spools) do not allways agree on "fit" in comparison to the axle maker.

there is a common difference in pressure angle of the spline itself...
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