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Unread 02-06-2011, 03:28 PM   #1
linexrandy
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8.8 build, weld brackets before or after regearing and new bearings?

My brackets came in and I was contemplating burning them on this week, but I also found a shop to regear it for $150 (I supply gears and install kit). Should I regear it after I weld the brackets on to prevent any possible damage to new bearings, or should it be welded first, then regeared. Just asking because I've always heard that the welding current will travel through the bearings and could possibley melt any rubber seals in the axle, and I will be moving soon and don't know if I can find any shops to do the regear for that cheap where ever I move.

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Unread 02-06-2011, 03:33 PM   #2
Krochus
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You're not going to do something stupid like attach your ground to the bearings or axle flanges are you?? If the answer is no then weld away

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Just asking because I've always heard that the welding current will travel through the bearings and could possibley melt any rubber seals in the axle,
The person that told you this.....never listem to them again on anything either welding or automotive related.
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Unread 02-06-2011, 03:46 PM   #3
linexrandy
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Thats what I needed to know. Err on the side of common sense.
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Originally Posted by lumpster View Post
inca gold looks like yellow raped burnt orange and burnt orange decided to keep the baby. gross.
2002 TJ Apex edition. 3" Full Traction Suspension lift. 1-1/4" body lift, 1" mml. 33 X 12.50 - 15 BFG MT. 15x8 Soft 8's. LP30 and D44 rear. 8.8 and HP 30 disco for sale.
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Unread 02-06-2011, 04:19 PM   #4
99TJSahara
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Welding through the axle can cause arc spots on the bearings, so ground as close as possible and don't ground across the pumpkin.
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Unread 02-06-2011, 04:35 PM   #5
linexrandy
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This is what I kinda heard, the "pitting" for lack of a better word from the arc going through the bearings with the rollers as contact points. Of course, this is info I gathered from people who "heard it from a friend", not ones that actually had it happen to them.

Soon as I get my SYE installed, gonna mock up the axle, weld the brackets, then do the regear. That way I have nothing to worry about. Going to replace all bearings and seals anyways so it shouldn't matter. Come on tax return money!!!
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Quote:
Originally Posted by lumpster View Post
inca gold looks like yellow raped burnt orange and burnt orange decided to keep the baby. gross.
2002 TJ Apex edition. 3" Full Traction Suspension lift. 1-1/4" body lift, 1" mml. 33 X 12.50 - 15 BFG MT. 15x8 Soft 8's. LP30 and D44 rear. 8.8 and HP 30 disco for sale.
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Unread 02-06-2011, 05:05 PM   #6
Ironworker709
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On a YJ most people have the axle all together and U-bolted into place so they can get the correct angle needed for the driveshaft while they have the vehicle load on the springs..THEN weld the bracket in place.

There is NO WORRIES about welding bearings together when welding the brackets on as long as you keep the ground close to your work and no bearings in the path of the weld current.
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Unread 02-06-2011, 06:09 PM   #7
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The problems occur when you do something like.. attach your ground clamp to an axle flange, the pinion yoke or the carrier. If you did that, the full current would pass thru roller bearings and could cause arc pitting. If you attach your ground clamp to the axle housing/tubes/end flanges, you won't have any issues.

If time allows, I'd probably weld the brackets on first just so I wouldn't have to worry about the burning the axle seals.. or maybe having spatter find it's way into the carrier area somehow.. Other than that, it really doesn't make a difference which you do first.. weld or regear.
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Unread 02-06-2011, 06:38 PM   #8
linexrandy
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Dang, so there is some truth to it.
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Quote:
Originally Posted by lumpster View Post
inca gold looks like yellow raped burnt orange and burnt orange decided to keep the baby. gross.
2002 TJ Apex edition. 3" Full Traction Suspension lift. 1-1/4" body lift, 1" mml. 33 X 12.50 - 15 BFG MT. 15x8 Soft 8's. LP30 and D44 rear. 8.8 and HP 30 disco for sale.
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