NAXJA Forums -::- North American XJ Association  

Go Back   NAXJA Forums -::- North American XJ Association > NAXJA Unibody Jeep Technical Forums > Jeep Cherokee XJ (1984 - 2001) > Modified Tech Discussion
HOME Member FAQ Sponsor Info Rules Bylaws E-Mail

Modified Tech Discussion Forum for Tech related discussion for Modified XJ's and MJ's.

Reply
 
Thread Tools Display Modes
  #1  
Old October 13th, 2018, 09:13
Wolperdinger Wolperdinger is offline
NAXJA Forum User
 
Join Date: Jul 2018
Location: Comox, BC, Canada
Posts: 18
Question Ford 8.8 - Weld Tubes or Not?

I'm going to put an 8.8 in my 91XJ. It looks like there's two dedicated schools of thought on whether or not to weld the axle tubes to the pumpkin. Some say do it, some say don't because it will create a stress point at the weld that is more likely to fracture. I'm going to weld an Iron Rock truss on to the axle as well, if that make a difference. Thoughts?
Reply With Quote
  #2  
Old October 13th, 2018, 11:42
Jim Malcolm Jim Malcolm is offline
NAXJA Forum User
 
Join Date: Aug 2014
Location: PA
Posts: 73
Re: Ford 8.8 - Weld Tubes or Not?

A U-Channel truss like that won't do much to resist spinning a tube, which is why you weld them to the housing. It doesn't need to be an all around weld to serve the purpose of resisting tube twist. 4x 1" welds spaced 90 apart would be sufficient. Mine's fully welded all around without a truss, but a guy I work with builds rears for full body drag cars and charged me way to little, so it was a no-brainer for a "grinder" like me. Just make sure you do it right; high nickle wire or rod, pre and post heat, controlled cooling, preferably tig, but mig turned up hot can work if you know what you're doing. Often times you can hack it and it never becomes and issue. You'll be hard pressed to break it with a 4.0, unless it's a complete bind in the rocks while hammering on it in 4 low, and at that point the shock axle shaft would probably still be the weak link. The issue with the 8.8 is that the "plugs" are just welds to the unmolested tube. In other axles, it's a pin that's pressed into holes in both. Obviously better at resisting twist.
Reply With Quote
  #3  
Old October 13th, 2018, 12:29
Wolperdinger Wolperdinger is offline
NAXJA Forum User
 
Join Date: Jul 2018
Location: Comox, BC, Canada
Posts: 18
Re: Ford 8.8 - Weld Tubes or Not?

Quote:
Originally Posted by Jim Malcolm View Post
In other axles, it's a pin that's pressed into holes in both. Obviously better at resisting twist.
I thought about doing that, too. I don't know if anyone else has tried it.
Reply With Quote
  #4  
Old October 14th, 2018, 00:28
trippled trippled is offline
NAXJA Member
 
Join Date: Apr 2006
Location: colorado springs, co
Posts: 2,013
Re: Ford 8.8 - Weld Tubes or Not?

I just mig welded mine to be safe. No pre or post heat, covered it with a welding blanket to be safe. Going on a few years now and still all good. Just make sure you clean it as best you can.
Reply With Quote
  #5  
Old October 14th, 2018, 08:35
Wolperdinger Wolperdinger is offline
NAXJA Forum User
 
Join Date: Jul 2018
Location: Comox, BC, Canada
Posts: 18
Re: Ford 8.8 - Weld Tubes or Not?

Quote:
Originally Posted by trippled View Post
I just mig welded mine to be safe. No pre or post heat, covered it with a welding blanket to be safe. Going on a few years now and still all good. Just make sure you clean it as best you can.
That's good to know, thanks. Might as well do it rather than regret it later on the trails. I think the truss will help prevent any possible tube fractures.
Reply With Quote
  #6  
Old October 14th, 2018, 12:57
denverd1's Avatar
denverd1 denverd1 is offline
NAXJA Member
 
Join Date: Dec 2013
Location: Tyler, TX
Posts: 432
Re: Ford 8.8 - Weld Tubes or Not?

do it. cheap insurance. I didn't realize just few inches of weld was enough, i'll be welding the tubes on the 44s when they go in

single bead on it or should I make a few passes? seems like a big joint to just lay down a single bead
__________________
Chili Pepper '98
4.5" lift, locked on both ends, 33s
10K winch and a lot of skinny pedal
Reply With Quote
  #7  
Old October 19th, 2018, 10:01
freerider15's Avatar
freerider15 freerider15 is offline
NAXJA Member
 
Join Date: Jan 2004
Location: FoCo, Crawlorado
Posts: 3,024
Re: Ford 8.8 - Weld Tubes or Not?

I would weld the tubes (will be on mine).

Just make sure to do it in stages. That much heat in a small time frame has a recipe for out of alignment axle tubes.
__________________
XJ Buggy On Tons
Reply With Quote
  #8  
Old October 19th, 2018, 10:04
denverd1's Avatar
denverd1 denverd1 is offline
NAXJA Member
 
Join Date: Dec 2013
Location: Tyler, TX
Posts: 432
Re: Ford 8.8 - Weld Tubes or Not?

1" bead at a time, then rotate to opposite side?

I've read Danas don't need to be pre-heated or slow cooled, not sure about 8.8
__________________
Chili Pepper '98
4.5" lift, locked on both ends, 33s
10K winch and a lot of skinny pedal
Reply With Quote
  #9  
Old October 19th, 2018, 10:19
freerider15's Avatar
freerider15 freerider15 is offline
NAXJA Member
 
Join Date: Jan 2004
Location: FoCo, Crawlorado
Posts: 3,024
Re: Ford 8.8 - Weld Tubes or Not?

I can't remember what the center section material is.

But put it this way, it's never wrong to pre and post heat (as long as you don't hit higher temperatures to where the materials properties start changing).

I'll be doing my D60 tubes in a manner of 6 hard tack welds, and welding opposite sections in between the tacks.

Then for the full burn in on second pass, I'll go around the entire thing back jump welding or whatever it's called (You jump back, and weld towards the bead you just laid down) to minimize overheating.
__________________
XJ Buggy On Tons
Reply With Quote
  #10  
Old October 19th, 2018, 10:21
denverd1's Avatar
denverd1 denverd1 is offline
NAXJA Member
 
Join Date: Dec 2013
Location: Tyler, TX
Posts: 432
Re: Ford 8.8 - Weld Tubes or Not?

ok. thx, I'll grab an IR thermometer and hit it with a torch
__________________
Chili Pepper '98
4.5" lift, locked on both ends, 33s
10K winch and a lot of skinny pedal
Reply With Quote
  #11  
Old October 20th, 2018, 19:00
Mach2nh Mach2nh is offline
NAXJA Forum User
 
Join Date: Oct 2009
Location: Weare NH
Posts: 251
Re: Ford 8.8 - Weld Tubes or Not?

I weld all axle tubes. Why risk it.
Reply With Quote
Reply


Currently Active Users Viewing This Thread: 1 (0 members and 1 guests)
 
Thread Tools
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off

Forum Jump

Similar Threads
Thread Thread Starter Forum Replies Last Post
anyone weld d30 inner C's onto a ford 9" blondejoncherokee Modified Tech Discussion 12 March 24th, 2011 00:06
RE mono tubes $50 Swamprat Red River Chapter For Sale/Wanted 0 April 29th, 2009 16:31
preping the axle to weld tubes to the housing??? Hammered Modified Tech Discussion 8 September 5th, 2008 09:23
Ford 8.8 axle tubes,.. bxj Modified Tech Discussion 5 August 11th, 2006 16:28
MPG down the tubes... JeepXJ93 OEM Tech Discussion 19 January 26th, 2005 20:15


All times are GMT -7. The time now is 03:00.


Powered by vBulletin® Version 3.8.9
Copyright ©2000 - 2018, vBulletin Solutions, Inc.
NAXJA and NAXJA logo's Copyright NAXJA. All content/images Copyright NAXJA 1999-2014