T-Case Bearing Wobbling

I went to the tranny shop to get a quote to install the new tranny & clutch and the mechanic told me that I had a bearing that was about to go out in the rear of the t-case.

I have no idea which bearing or what it's called but basically he grabbed the rear drive shaft where it attaches to the t-case and shook it up and down and there was quite a bit of play in there.

Does anyone know what this is? Is it really a bearing or could it be something worse like worn gears or something.

If it's a bearing which one would it most likely be?

 

IIRC, there are only 2 sets of bearings, front and rear. the front bearing cap is shimed to proper depth to keep the rear snug in the races/cups.

 

I'm wrong. the rear has the shims. Sounds like the bearing cap is outta whack

 

I know there's a schematic of the D-18 somewhere on the net.

I actually have one but it's numbered with the parts but not labled.

Still looking for the one that's labeled.

 

Number 8 above are the shims/bearing cap region of the south side of the this northbound D18, John

 

Baby John: don't you have a FSM? If not, get one. Worth it's weight in gold.

 

Thanks Brad, but Good Grief!!!

That's way too much stuff to look at.

I guess I'm just going to have to run it like it is.

Another example of the symptoms. The mechanic grabbed the e-brake drum and wobbled it up and down and said "it aint supposed to be doing that".

Any other guesses?

 

Is this the same drawing?

 

You can get yourself in real trouble if that assembly fails John. BIG TROUBLE. Better fix it. Start by checking torque on the bearing cap. To do this you will drop the driveline/brake drum and expose the bearing cap. Tell me when you have that done. you may find that the yolk is just loose.

 

prurdy much

 

OK. I know absolutely nothing about what's going to be inside this thing but I guess I'm going to have the stuff on the ground so I may as well open it up and see what happens.

Only real problem I'm having is the fact that this tranny shop is not going to want to wait till I order parts for the t-case and repair it before he puts all the stuff back in.

On the other hand the guy already knows that I'm going to have to have the flywheel resurfaced and he agreed to wait on that. Maybe I can open up the t-case while I'm waiting on the flywheel resurfacing.

BTW how much does it cost to have a flywheel resurfaced?

 

I would first pull the driveshaft and check out the rear yoke nut. If this was loose it could allow the drum to move around some. If that is tight then check the rear bearing cap bolts like Brad said.

John, NAPA resurfaced my flywheel for about $20

 

John I don't think we are talking about a rebuild or nuttin. It ran quiet 2 weeks ago so just check to see where the play is and we can walk you thru the fix. For petesake, I rebuilt mine all by myself [and beer] and I am an idiot, you can fix this. Those boxes are very simple machines. Print the exploded view out and take it home and study. Show Tyler, he'll be able to help shag wrenches.

 

IMHO
no reputable tranny shop or mechanic would put it back together that way.
or let a customer drive it that way
this needs to be fixed or worse things can happen
as mentioned above, check the torque on the flange nut and the rear cap bolts
worst case, pull the rear cap off and see what you got

FYI
the shaft is the mainshaft and the bearing is called the rear output shaft bearing

 

Yup, Jim's right. If for no other reason than liability, they can't afford to let it go that way. It may be as simple as the bolts or nut having come loose, or just need reshimmed. Nickmil.

 

OK. I'm not as worried as I was.

Actually there's another problem I didn't even mention. On the front shaft @ the axle end I have a good deal of play where the yoke (I hope that's right) is attached to the shaft. There's no play @ the u-joint. But where the yoke mates to the shaft there's wobble.

The mechanic said that since it only saw use during 4WD operation it might not be a big deal but the rear definitely needed fixing.

How does the yoke attache to the shaft? Is the shaft splined and the yoke slides onto it? Is it pinned?

Boy am I stupid.

 

Oh yeah,..I was wondering if maybe this looseness in the rear shaft (first problem mentioned in this topic) might be what's causing my vibration when in reverse?

 

there is a removeable dust cap on the yoke that allows the yoke to slide off the splined portion; If there is no play in the ujoints, only in the slip yoke, not a major problem; most are sloppy
but the edrum shouldn't be moving around at all

 

Novaks Guide to Rebuilding Dana 18 and 20 Transfer Cases.

http://www.novak-adapt.com/knowledge/transfer_case_article.htm

Includes the following:



1. Companion Flange and Oil Seal
2. Emergency Brake Drum
3. Emergency Brake
4. Brake Operating Lever
5. Bearing Cap Oil Seal
6. Brake Operating Lever Stud
7. Rear Bearing Cap
8. Rear Bearing Cap Shim Set
9. Bolt
10. Lockwasher
11. Bolt
12. Transfer Case Rear Cover
13. Rear Gasket Cover
14. Intermediate Shaft Lock Plate
15. Transfer Case
16. Shift Rod
17. Poppet P1ug
18. Poppet Spring
19. Poppet Ball
20. Shift Rod Interlock
21. Bearing Cap Gasket
22. Front Bearing Shaft Cap
23. Breather
24. Shift Rod Oil Seal
25. End Yoke
26. Oil Seal Gasket
27. Bolt
28. Lockwasher
29. Shift Rod
30. Front Wheel Drive Shift Fork
31. Underdrive and Direct Shift Fork
32. Filler Plug
33. Main Shaft Gear
34. Main Shaft Washer
35. Thrust Washer
36. Intermediate Gear
37. Bearing Shaft Snap Ring
38. Output Clutch Shaft Bearing
39. Companion Flange Nut
40. Plain Washer
41. Output Clutch Shaft
42. Output Clutch Shaft Gear
43. Output Shaft Gear Snap Ring
44. Thrust Washer
45. Output Shaft Gear
46. Output Shaft Sliding Gear
47. Pilot Bushing
48. Output Shaft
49. Cone and Rollers
50. Output Shaft Bearing Cup
51. Speedometer Drive Gear (6-t)
52. Needle Bearing
53. Bearing Spacer
54. Intermediate Shaft
55. Drain Plug
56. Bottom Cover Gasket
57. Main Shaft Nut
58. Transfer Case Bottom Cover
59. Speedometer Driven Gear Sleeve
60. Speedometer Driven Gear (15-t)
61. Speedometer Driven Gear Bushing
62. Backing Plate Gasket
63. Bolt
64. Bolt
65. Bolt
66. Bolt
67. Lockwasher
68. Nut
69. Output Shaft Felt Seal