Welding rear diff

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B

BJ40 3B

20 Year 15 Year 10 Year
Joined
Aug 15, 2003
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13
Messages
87
Hi

I have a BJ40 wich has a semi-floating rear axle (30 splines with c-clip).
I am thinking of welding it as woody explains in "technical links" (At front i have an ARB installed). What are the opinions about this? tires will be 33x10,5x16 or maximum 35x10,5x16 and i will use it 75% offroad.
Will i have any reliabilty issues with that?

Thanks
 
Many people have used this set up for years without any issues, so long as the shafts are not welded to the side gears. You will be able to replace a broken axle in the event that occurs.



Good luck!

-Steve
 
Mine was done with what woody learned on his and hasent Broken yet!! ive had it about 3 months.. woody is going on a coule of years on his.. Use a 220 welder and turn it up.. rotate the spiders as woody descrived to get in the cracks..

I will be pulling it out the first chance i get to either go back to stock for the winter or in favor of an auto selecting locker.. the tires just ware out too quick on the street and make alot of noise with Radials.. But my truck is more a 50/50 trail/Dailey driver
 
I thrashed mine mercilessly this past weekend....again...and it's still working perfect.

nice part is, you can later replace with a Full detroit or ARB if you choose...
 
Does the OEM axle shafts deal well with that setup? Does anyryone broke any axle shafts? Is it possible to happen with tires up to 35?

Woddy- What tire size are you using with that set up?
 
my rig runs stock tires, suspension, and drivetrain....

once you upgrade the front shafts to 4340 inners and Longs, the rear coarse pinion is the next weak point, followed by the rear shafts.

However, I instead busted a t-case front output shaft...

my rear shafts are going in for cryo treating soon...

also, I tend to be VERY hard on my rig....5 rolls in 2003 and 3 in 2004 attest to that....plus LOTS of hops in Poteau and Clayton this past weekend...

pic from Sat afternoon....didn't they come this way stock?
clayton.webp
 
I have seen rear axle shafts break with a 33" tire...


BHCC-01' some cat from CO broke a rear axle shaft just entering Trespass... Had a Detroit in the rear...was running 35's...

Can't remember his name, but he was all up in my face about ARB's being junk and blah blah blah...made me laugh...


Good luck!


-Steve
 
Mine is not so beaten and "tested"!!! It's a BJ40 with a 3B engine, power steering, turbo, intercooler, discs allround, hydraulic handbrake, very modified suspension, ARB locker in front and probably welded rear end....
Well, it's my almost 2 year weekend project...
 
those lowers are holding up for you???

Cool...
 
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