BJ73 breaking CV's

Post by **sava75** » Sun Oct 11, 2009 7:10 pm

Hey all,

Yes, I have a BJ73 non turbo 3B with 34 11.5 x 15inch simex and front 'Lokka'. Out of 3 trips I have broken the RH CV twice. On both occasions it struggled on a rocky hill climb and after 2-3 attempts it went bang. What am I doing wrong? I know its a weak point on Toyota's but maybe its a combination of driver error/ simex lugs (too much traction)?? The front end just seems to bounce way too much.
Should I go for chromoly CV and axle set? Will I start breaking diff centres after that? Or am I just having a little bad luck?

Thanks in advance.

Sam.

Post by **MADSHORT** » Sun Oct 11, 2009 7:22 pm

Ok Sam ive broken heaps and lots
I found when you actually back off that the cruiser starts climbing really good last time i done tuff truck i took 8 cvs on axles
thank god i didnt need them ALL
i would suggest that you grab some chromolys
they should sort your prob
my 73 with haultech heat treated cvs has still not busted one 4yrs plus
opps i must be driving softer

cheers Gordon

Post by **hulsty** » Sun Oct 11, 2009 10:02 pm

the combination of front locker, large rubber and bouncing on loose terrain is whats doing it, when I did similar terrain I just used the rear locker and let the front do its thing as a open diff. Never any problems.

Go longfields and never look back.

Post by **pricey** » Mon Oct 12, 2009 5:12 pm

Auto locker could be an issue as well. They're pretty rough on the driveline constantly locking and unlocking. A mate constantly breaks cv's in a GQ with an auto locker. And only running 33's as well. I break my share of cv's in my Middy running 35 MTR's but 6.1 diffs with 13BT+auto.
If you don't want to upgrade to an air locker then chromoly is pretty much the only option.

Post by **MADSHORT** » Mon Oct 12, 2009 8:39 pm

hey pricey wot you know

Gordon

Post by **mmaaxx** » Tue Oct 13, 2009 9:30 am

heard about your predicament savva...saw the pics too.....seriously, Ive seen your truck do harder tracks before, and Im surprised you busted a CV on that track.

Savva....send an email to LockdUp 4x4........heres a link its for a 60series front CV, not sure how much different it is from a 73 middy, but it gives you an idea atleast -
http://locktup4x4.com.au/landcruiser-85 ... r-639.html

These have been tested to 5,600ft/lbs where the stock axle shaft broke but the cv remained intact. A stock CV will suffer bell failure at 4,000 ft/lbs.

These cv's come with a 2 year warranty for vehicles running upto 35" tyres with standard Toyota OEM engines

Im sure there are others available but its a start.

Post by **pricey** » Tue Oct 13, 2009 4:03 pm

MADSHORT wrote:hey pricey wot you know

Gordon

Ah Gordie you're alive and kicking, good to see

Don't know a great deal. . . . . . BUT . . . . . . .
Since we changed the 40's front end to a GQ, we haven't broken a CV in 4 years playing on 36's and 39's

But i still break them in the middy

Post by **sava75** » Tue Oct 13, 2009 4:10 pm

thanks everyone for your info and assistance. please keep the comments coming.
I am now weighing my options and will contact locktup soon.

P.S Maxxi, that was definately the worst hill my middy has been on. I was very happy i got that far up!

I will go back and try again after some mods are done....ie: rear locker, fix brakes, more flex in suspension.

Post by **dogbreath_48** » Tue Oct 13, 2009 4:39 pm

With a detroit locker and 34"JT's/37" claws I used to break CV's like they were made of chalk.

Now with an air locker and longfields, no problems. Haven't given it a really hard time but the aftermarket 4.56 diff gears are holding up fine, despite being the new fuse point.

I honestly think i would have broken far fewer CV's if i just ran the air locker with standard CV's.

Post by **the gun** » Tue Oct 13, 2009 7:15 pm

351 40 series 35' pedes but now run 37 sticky treps. never broken a cv but its had longfields almost since built.

Post by **zenteren** » Tue Oct 20, 2009 7:49 am

What kind of longfield cv's and shafts will fit to FJ73 front diff? I'v been on longfileds web site and found out that they deal only with BJ-40 and 80's font ends.

Post by **dogbreath_48** » Tue Oct 20, 2009 9:15 am

zenteren wrote:What kind of longfield cv's and shafts will fit to FJ73 front diff? I'v been on longfileds web site and found out that they deal only with BJ-40 and 80's font ends.

I have the 40 series super set in my hj75...haven't checked the inner splines to see how deep they are engaging at the diff and didn't get a chance to compare to the original axles...but they seem to work for me and plenty of others!

Post by **sava75** » Tue Oct 20, 2009 5:03 pm

yeah, i contacted them over in the states and all they need is an axle length and they can make them to suit

anyway, still deciding
*better cv's?
*change driving style?
*rear lokka?
*all of the above

thanks for the replys

Post by **MogLux** » Wed Oct 21, 2009 8:52 am

Changing driving stlye will only help for a while. The toyota CV's are ok but you will always break them. I run longfields with 42 irocs and never broken any. Its well worth the $1000 to buy them. It will cost you less in the long run.

sava75 wrote:yeah, i contacted them over in the states and all they need is an axle length and they can make them to suit

anyway, still deciding
*better cv's?
*change driving style?
*rear lokka?
*all of the above

thanks for the replys

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