Live action from FUMANCHU182.

[drag racer]

Man, she looks pretty used-up

 

[fumanchu182]

 

[Unholy707]

Watching now

 

[fumanchu182]

old diff bolts and a pry bar, 32mm impact socket and ugga duggas.
Smack with really large punch and 5lb dead blow
Pinion is out
Flange is on top of that seal
Dirty hoe, simple green and brake clean, high af after
Under the seal is a bearing
Pressure wash to clean it all out
In the kit comes a setup plate, bolts sourced out of the fuck it bucket
She clean…
caution: do not use brake clean on the pinion flange, pressed rubber bushings you cannot replace, pinion was inspected, all bearings good, all machined surfaces good.
Back of diff where one bearing sits in the races
Pinion gears are sharp, need to pull the ring gear but thats a tomorrow me problem, time to go get beer

 

[16GoManGoHC2]

Thats a hell of a beefy bearing arrangement there on that pinion assy!!!

 

[fumanchu182]

Thats a hell of a beefy bearing arrangement there on that pinion assy!!!

It is, pain the balls to clean. However they spin freely now, was having an issue where it was binding before cleaning, think there was a ton metal in there. There are no specs on ZF diffs so its going to be trial and error to get backlash correct. I have numbers from dusterhoff and will confirm on assembly. Need to pickup seals on Monday.

 

[Unholy707]

Thats a hell of a beefy bearing arrangement there on that pinion assy!!!

Okay now I see why there’s no aftermarket dang

 

[Unholy707]

This is some of the most beneficial info I have seen on the forum. Following this closely, great job @fumanchu182

 

[Unholy707]

Good to see you can disassemble the pinion and install it theoretically in any case. Thinking I should have kept my 3.70 as a spare

 

[fumanchu182]

Good to see you can disassemble the pinion and install it theoretically in any case. Thinking I should have kept my 3.70 as a spare

The ring and pinion would be different

 

[Unholy707]

The ring and pinion would be different

Right, but if a case went bad you could swap them into a new case if you crack one or whatever. I was under the impression (and thought I had heard) the pinion wasn’t removable

 

[fumanchu182]

I wouldn't even dare try to remove that pinion from the shaft. It is hard pressed on there and would be a hell of an effort. But yes you are correct, cases are swappable. I have my LLC being processed by ZF to see if I can get FSM and repair specs.

Right, but if a case went bad you could swap them into a new case if you crack one or whatever. I was under the impression (and thought I had heard) the pinion wasn’t removable

 

[drag racer]

Great stuff! LMAO at the "fuckit bucket" quip. Yea, ZF seems totalitarian on control of parts and service data - pisses me off! Hopefully, they will wake up and realize with millions of Chargers and Challengers built, there will be a healthy aftermarket demand for diff and transmission parts for a long time.

 

[fumanchu182]

Great stuff! LMAO at the "fuckit bucket" quip. Yea, ZF seems totalitarian on control of parts and service data - pisses me off! Hopefully, they will wake up and realize with millions of Chargers and Challengers built, there will be a healthy aftermarket demand for diff and transmission parts for a long time.

So I did find this documentation on the pinion flange removal and installation to repair the seal. This helps me with re-assembling that, however I didn't mark any orientation as I was cleaning out metal so that was more of a priority. I wonder if imbalance will occur. However if you install this into a billet housing there's no way to keep track of that so, by reasoning maybe its a herring???


this is for re-assembly

My mind boggles at this:
"If the pinion nut alignment index mark exceeds the pinion shaft alignment index mark the unit must be discarded. If the pinion nut alignment index mark falls short of the pinion shaft alignment index mark the unit will possibly generate an Noise, Vibration, or Harshness (NVH) concern."

Knowing this I would have just bought a billet case and said screw it with these housings. However I don't think this will be an issue, we shall see.

 

[fumanchu182]

Calling in the big dogs @Hatermkr do you have any torque values for the pinion flange nut?

 

[drag racer]

Yea, I don't have a feel for this ZF design since I have never seen a big ass ball bearing pinion design like that until now - all US stuff I know of has tapered roller bearings as you know. I for one sure appreciate you sharing your journey into the unknown with us - I bet a lot of us are taking notes

 

[Unholy707]

Yeah wonder what the point of it being engineered that way is

 

[Unholy707]

So I did find this documentation on the pinion flange removal and installation to repair the seal. This helps me with re-assembling that, however I didn't mark any orientation as I was cleaning out metal so that was more of a priority. I wonder if imbalance will occur. However if you install this into a billet housing there's no way to keep track of that so, by reasoning maybe its a herring???

View attachment 115822
this is for re-assembly
View attachment 115823
My mind boggles at this:
"If the pinion nut alignment index mark exceeds the pinion shaft alignment index mark the unit must be discarded. If the pinion nut alignment index mark falls short of the pinion shaft alignment index mark the unit will possibly generate an Noise, Vibration, or Harshness (NVH) concern."

Knowing this I would have just bought a billet case and said screw it with these housings. However I don't think this will be an issue, we shall see.

so let me get this straight. They’re marked from the factory (maybe), and if you can’t see the mark on the pinion flange and the nut, you’re supposed to make your own index mark before disassembly to mimic factory “torque”. Is there no set torque spec for these??? Blows my mind too. I guess that’s how they get around telling you the torque specs? Then again they also tell you to index the driveshaft before you take it out I haven’t done that and I’m fine, maybe I get lucky but that doesn’t have anything to do with torque indication like this index mark would

 

[GNBRETT]

Great freaking info thanx of posting!

 

[oilburner]

Calling in the big dogs @Hatermkr do you have any torque values for the pinion flange nut?

there is no torque for the nut, you tighten the nut till you achieve bearing pre load. tighten in small amounts till achieved. do you have the spec for pre load cause I couldn`t find it anywhere but I had no reason to take my flange off when I did my wave track. brgs. felt smooth with no end play.