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Rampage MT center differential gears binding - Help Please

Discussion in 'Chassis & Drivetrain' started by G-Man, Aug 2, 2016.

  1. G-Man

    G-Man Junior Member

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    I am having serious binding issues with the two gears in my center diff. Here is how it started. I noticed the center drive shaft drive cup going to the front diff was loose and lost a set screw. So I ordered after market cups with the stainless sleeves pressed on etc. I installed the new cups and reinstalled the assembly back in the truck. Now it is binding bad when I bolt the two center diff mounts down to secure it. I have yet to buy the aluminum mounts and still use the plastic ones BTW. So I then started thinking it had something to do with the new cups. I have another new center diff assembly with all stock parts and it still binds after tightening it down completely. I have had this diff in and out probably ten times now with different combinations. I am so frustrated with this thing it is sickening!! I have tried moving the shims behind the bearings in the mounts, I put two shims in one side then tried the other,I tried just one shim on one mount, I tried a shim in each mount and ALL have done the same thing. I have the teeth on the crown gear facing the rear of the vehicle and I have the mounts installed with the wider side facing down. Pretty sure I have the install correct . Hopefully somebody else has had a similar issue that can enlighten me on the subject before I make it an RC molotov coctail...
     
  2. G-Man

    G-Man Junior Member

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    I have the aluminum mounts coming for tomorrow. Gonna give them a try. If anything it will strengthen the diff up some. I guess none of you have had any similar issues???
     
  3. G-Man

    G-Man Junior Member

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  4. Phill

    Phill Well-Known Member

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    CentreDiff_zps3ddbf263.jpg CentreDiff_zps3ddbf263.jpg Does this help at all?

    CentreDiff_zps3ddbf263.jpg

    CentreDiff_zps3ddbf263.jpg
     

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  5. G-Man

    G-Man Junior Member

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    Ya that helps alot thank you. I am wondering if something is bent to make it bind the gears. I may pull the input/brake pinion shaft out and look closely at it if these aluminum center diff mounts I just got don''t help. What I did is took the tranny gears off except the input shaft to center diff, then left the dogbones out of the center diff. When I spin the input shaft to center diff it is rather difficult to turn and the gears sound like a roulette wheel at a fair but worse.
     
  6. G-Man

    G-Man Junior Member

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    Well I am into this further than I expected. I also noticed the nuts holding on two of the transmission gears were coming loose. I removed the nuts and used loctite to reinstall. This now made the binding worse. I am guessing all the shafts got bent from all the loose parts.
     
  7. Phill

    Phill Well-Known Member

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    Have you checked the brake adjuster screws just in case?
     
  8. G-Man

    G-Man Junior Member

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    Not sure what the brake adjuster screws are. But I did check the set screws in the brake shaft connector. The set screws were intact and shafts were like glued in from factory. I am going to replace all the shafts and gears. I ran two tanks through it yesterday.
     
  9. Phill

    Phill Well-Known Member

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    On the gear side mount you will see 2 small grub screws , one top and one bottom that are used for adjusting the brakes.

    Back em out a little and see if it makes any difference.

    Your brake shoes should be loose enough to rattle when not applied
     
  10. G-Man

    G-Man Junior Member

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    Ya the brakes already rattle now. I think the pinion is either bent a little or the teeth are chewed up. I haven't had a chance to pull the brake assembly apart yet. Wish I could figure out how to post a video of how loud the mesh noise is between the input pinion and center diff gear.
     
  11. G-Man

    G-Man Junior Member

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    Well I finally got the time to tear the transmission gear plate off with the brake assembly. I now see that the gear shaft going into the brake assembly is bent a little. I can see it when I spin it. I am also getting a bearing noise out of it. I ordered a kit of bearings from Boca which should be here Monday along with all the other parts. The bearing kit doesn't include the gear plate bearings which I ordered separately. I am excited to get this thing back to running right again..
     
  12. ika

    ika Senior Member

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    Center diff mount have up/down direction, gear must be down ti chassis, there is special cut on chassis - gear to sit down.
     
  13. G-Man

    G-Man Junior Member

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  14. ika

    ika Senior Member

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    Short / thin side must be down.
     
  15. G-Man

    G-Man Junior Member

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    Ok thanks for clearing that up. Because I didn't realize the hole for the bearings in the mounts were not centered when I tore it apart. Now when I put it back together tomorrow I will be sure it is in correctly. Thanks man!!
     
  16. G-Man

    G-Man Junior Member

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    New input pinion and lay shafts. New bearings throughout the gear plate. No more binding. But there is a little in and out play in the brake assembly making the pinion to center diff walk in and out a little. May have to shim the pinion to bearing a hair.
     
  17. Phill

    Phill Well-Known Member

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    A little movement there is normal

    Just as long as it's meshing OK
     
  18. G-Man

    G-Man Junior Member

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    Thanks Phill you have been a great help!! The movement is not severe just a little. The mesh seems better when I push in on the shaft. If I pull out it isn't as good but still not bad. There really isn't anything that holds that in place. May just leave it be if a little play is ok. I did shim the clutch drum though. It was enough to bother me.
     
  19. Petrolheadz100

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    Hiw did the truck tun after the bearings install? Could it have been a bad bearing?
     
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