Aaaargg... i have diff killing Charger

[kingjoop]

I give it up... my Charger eats diffs  

Today my 3rd diff (8 3/4) got killend by my Charger..   i had only 50 miles on it this time..

here's how it started..

when i was rebuilding the car, i got myself a brand new diff @ randy's ring a pinion.. 4.10 with yukon locker.. my charger killed it after about 300 miles... wrong oil? i was thinking.. but no.. Randy's ring a pinion sayd it was alright.. so i put in my spare diff (highway gear) so i could drive and orderd a new diff again.. after 150 miles.. the diff got killed again.. wtf? i swapped the driveline axle with my buddy's Charger hoping that was the problem.. new diff arived.. got in and tonight it freaking broke down again after 50 miles..

anybody knows what going on? i'm getting crazy (and broke) here  

thanks  

[RD]

pinion angle not right maybe?

[mauve66]

axle end play not set right?? maybe that would effect the axle bearings though???
sure sucks, hope it gets better

[Charger RT]

what fails on them? Is it the same issue on all of them?
Tim

[tan top]

pinion angle not right maybe?

thats what i was thinking    but  50 miles thats quick 

[kingjoop]

first time it was my locker that got broke:

pic:



2nd time.. dunno... not the locker, course it didnt had any   i just trown it in the corner of the garage.. ill have to go out to the garage and check it  
i remember i was on the highway, not going that fast and a big boom and high noise.. and when i stopped oil was comming out of the front (bearing)..

3rd one.. i just putted the car in the garage tonight and left it course i was not in the mood..  
same thing.. i was driving about 40m/h and big bang and high noise again.. i just drove it home.. (went ok, but strange high noise)..

[Charger RT]

I assume you are swapping out pumpkins and reusing the housing?
If so are you getting the housing very very clean?
Is the metal getting to the axle bearings? And have they been geeting replaced with the pumkins?
Tim

[kingjoop]

eeuh... my english aint that good  so dont understand all.. 

what i've done is replace the whole diff, so including the housing..

i took out the axles from the 8 3/4 housing and checked the splines (nothing went wrong there)... cleaned the axles and housing... put them back in with the new diff (housing, ring and pinion and locker)..

it has brand new heavy duty springs (summit) under it.. and adjustable pinion snubber..

[elacruze]

What abuse is the rear end taking?
Burnouts?
Holeshots?
Donuts?

Maybe you just need a Dana 60. 

[Cooter]

You are sure you don't have two different size tires on either side of the rear right? 1/2 inch in difference can cause you all kinds of problems...

Remember that today, most metal parts are being machined and manufactured cheaper and cheaper...I can only hope that Randy's R&P isn't secoming to this practice in order to keep profits up....

[A383Wing]

Has the differential housing been checked for straightness from axle bearing to axle bearing?

[bordin34]

Is that your Charger I remember doing endless donuts in a couple videos?

[kingjoop]

yes, sometimes i abuse the car with donuts and burnouts.. but last 2 diff's i didn't... 

think i better put my ride in the shed for a while and save up for a dana60  don't wanna put to mutch money in experimenting anymore 

[tan top]

I assume you are swapping out pumpkins and reusing the housing?
If so are you getting the housing very very clean?
Is the metal getting to the axle bearings? And have they been geeting replaced with the pumkins?
Tim

yes that was my next thought !  

  could be your driving style  needs a DANA

[Charger RT]

eeuh... my english aint that good  so dont understand all.. 

what i've done is replace the whole diff, so including the housing..

i took out the axles from the 8 3/4 housing and checked the splines (nothing went wrong there)... cleaned the axles and housing... put them back in with the new diff (housing, ring and pinion and locker)..

it has brand new heavy duty springs (summit) under it.. and adjustable pinion snubber..

Do you have a 500 CI engine in it like your signiture shows?

What housing numbers are on the 8 3/4 center sections you are using?

Your english is just fine. I would not have known it was your second language if you did not post it. The problem is we use many words for the same thing. For an example the center section of the rear I have heard called many things over the years. center section, chunk, pumpkin, pig and a few more I can't think of right now.
Tim

[kingjoop]

Yes, a 500 stroker engine 

742 cases (those are the one Randy's ring a pinion used for me).. d*mm things cost me 1400$ and they told me it would be no trouble with the 500 stroker in front of it.. 

ah.. i see.. i understood the pumpkin, but could not connect the word to a mopart 

[kingjoop]

I assume you are swapping out pumpkins and reusing the housing?
If so are you getting the housing very very clean?
Is the metal getting to the axle bearings? And have they been geeting replaced with the pumkins?
Tim

yes that was my next thought !  

  could be your driving style  needs a DANA

this morning i started to save $$ for the Moser dana  or someone here mus have a spare dana i could buy   
stupid shipping will cost me a furtune to the Netherlands 

[Rob R]

Your housing is BENT...and bent bad...did you weld on it?

[elacruze]

I assume you are swapping out pumpkins and reusing the housing?
If so are you getting the housing very very clean?
Is the metal getting to the axle bearings? And have they been geeting replaced with the pumkins?
Tim

Oh daaaaammm.....

Yeah I missed the obvious, I trust you are cleaning all the scraps from previous explosions out of the housing, end to end?

[kingjoop]

Your housing is BENT...and bent bad...did you weld on it?

i didn't.. not sure if previous owner did?  

i have a swaybar on top of my 8 3/4, would that have anything to do with it?  

Oh daaaaammm.....

Yeah I missed the obvious, I trust you are cleaning all the scraps from previous explosions out of the housing, end to end?

Yes, cleaned it all out.. also used high presure water to clean the 8 /34 itself..

[Manifold]

I'm with the bend housing crowd... or, any chance the rear end isn't mounted square in the car? Maybe the new springs have contributed to having the housing misaligned - did you start eating third members before or after the new springs?

Good luck figuring this one out. I would think the 8 3/4 would be adequate for your setup.

[kingjoop]

i'm the second owner of this car... car has been sitting in a shed since 1972 till i got it in feb. 2004.. i never drove it before the rebuild..

first i had a different problem with the car.. it snapt my tranny end housing (a few times) when i put the pedal to the metal... i shorted my driveline axle by a inch and had to buy a new tranny (i hated this becourse the wrecked one was a new tranny rebuild up 2 1100HP (manuel valve)).. but that problem is solved now.. but still having the diff problem.. this drive line has cost me to mutch money now.. wanna get the car fixed so i can start enjoying it since i got it

[Rob R]

The car has been in the ditch...(dukes of hazard kinda thing) the shock plates are most likely bent a bit along with the rear end housing.When you see spider and axle gears eaten up like that the housing is to blame . And when the tail shaft breaks alignment is the issue...

[b5blue]

I question "Locker" locker is for drag racing in a straight line you want a limited slip (Tru Trac) Those "doughnuts" would raise hell on a locker rear with your large rear tires traction and all that torque I would think! 

[flyinlow]

Wheel hop? Doing burnouts or donuts over rough pavement?

I would think a healthy 8 3/4 axle with street tires and a good suspension could do lots of burnouts without breaking.

[elacruze]

I'm against the bent housing theory.

I've seen our vehicles (basically an International 7400) which weigh near 40,000 lbs. log 1000+ miles with ~5* of camber bent into the rear axle housing due to launching and hard landings. Zero failures.
I've also seen housings intentionally 'tuned' on circle track vehicles to put camber in the rear end, and don't explode.
Enough bend to be root cause would be visible and obvious, and show in tire wear very quickly.

I'm not saying that a bent housing is ok, I'm saying I think your axle has not had enough miles put on for any housing issues to be the root cause. Just too soon.
Now, couple a bent housing with significant abuse, or even normal 500" abuse, maybe you could get there.

[b5blue]

Unless I'm way off, and I may be, a locker puts even spin to both wheels 100% of the time, the rotational difference from wheel to wheel in a turn is why the thing is Differential. Something must give in a turn as one wheel spins more than the other.   

[elacruze]

Unless I'm way off, and I may be, a locker puts even spin to both wheels 100% of the time, the rotational difference from wheel to wheel in a turn is why the thing is Differential. Something must give in a turn as one wheel spins more than the other.    

*Threadjack Warning*

That's a 'spool'. A 'locker' is a generic term people incorrectly use for any sort of traction device.

A 'spool' is nothing more than a ring gear carrier which locks the gear to both axles. Both wheels turn at the same speed at all times.

Technically a 'Detroit Locker' is a particular device that locks in to whichever side is turning slower; the drive torque is always applied to the wheel on the inside of a turn. The device does not apply any torque to the outside wheel until the inside wheel slips to the same speed. This allows the outside wheel to overspeed and coast.
They transfer 100% torque to the wheel with the most traction when one wheel slips.
Detroit Lockers are very harsh-acting, hateful for towing, and nearly bulletproof. They are found in everything from cars to front-end loaders.

A 'True-Trac' is a traction device invented by Zexel-Torsen and produced by Eaton. It uses planetary worm gears to jam against a housing when wheel speed reaches a certain differential. It acts as as open differential up to a point, and can transfer about 80% torque to the wheel with the most traction. These are very smooth, great for towing, and very durable.

As far as I know, all OEM 'posi' rear axles use friction discs much like an automatic transmission to send torque to the wheel with more traction. There are many variations on this theme, some which use springs at a specific pressure, some which are capable of changing pressure on the clutches by sensing spider gear action. Some have different shaped clutches but the mechanism of torque transfer is the same. This is the 'limited slip' 'posi' or 'sure-grip'.

Here's a work safe, reasonably reviewed, lengthy and surprisingly worthwhile Wikipedia article on the subject.

http://en.wikipedia.org/wiki/Limited_slip_differential

[TylerCharger69]

What about the axle end-play adjustment on the passenger side??....Could that be way off causing the dissention?

[69rtse4spd]

Are you breaking in the new gears correctly, i.e. per the instruction's sheet. Or do the pig units come all ready broke in from Randy's. The new gears I got for the Dana said to drive for ten minutes then let cool down. I plan on checking the axle end play after cool down also, as soon as I get it put under the car. Could take it to a body shop & have them put on there frame rack & check to see if the frame is tweaked any. Got a 4.89 with 4.10 sure grip in the 70 now, do long burn outs with no problems. Just my  , hope you get it worked out.