Rubi Transfer Case Explosion
01-09-2010, 11:02 AM
#21
JK Jedi Master
Another thing to consider:
When one replaces the front drive shaft with a shaft that has a double cardan joint at the t-case, the front axle must be rotated to get the front single joint as straight as possible. Trying to maintain caster may prevent that.
Having an angle on the front joint pretty much negates the benefit of the double cardan at the t-case. They are not perfect constant velocity joints. They have their own dynamic issues, and are a source of vibration, too.
When one replaces the front drive shaft with a shaft that has a double cardan joint at the t-case, the front axle must be rotated to get the front single joint as straight as possible. Trying to maintain caster may prevent that.
Having an angle on the front joint pretty much negates the benefit of the double cardan at the t-case. They are not perfect constant velocity joints. They have their own dynamic issues, and are a source of vibration, too.
01-09-2010, 04:02 PM
#23
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Something else happened here as there are a lot of folks running 35's and 37's and gears at hi-speeds, and there have been VERY few problems.
He may have had a bad bearing, or the case cracked shortly before and leaked out the fluid unbeknown to him, and the bearings ran dry and exploded.
Keep us informed please.
Last edited by Slippery; 01-09-2010 at 04:09 PM.
01-09-2010, 04:24 PM
#24
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I'm running almost the same rpm's now as I was with stock gears. You have to realize if you regear with larger tires it's not necessarily going to give you higher rpm's, because the larger tires offset it. So that's out of the question.
I did some digging and found out the bearings on the front output were seized up. There seems to be a problem with getting fluid to the front bearings. Sooooo it looks like an atlas 2 might be going in
I did some digging and found out the bearings on the front output were seized up. There seems to be a problem with getting fluid to the front bearings. Sooooo it looks like an atlas 2 might be going in
01-09-2010, 04:58 PM
#25
JK Jedi Master
I'm running almost the same rpm's now as I was with stock gears. You have to realize if you regear with larger tires it's not necessarily going to give you higher rpm's, because the larger tires offset it. So that's out of the question.
I did some digging and found out the bearings on the front output were seized up. There seems to be a problem with getting fluid to the front bearings. Sooooo it looks like an atlas 2 might be going in
I did some digging and found out the bearings on the front output were seized up. There seems to be a problem with getting fluid to the front bearings. Sooooo it looks like an atlas 2 might be going in
I'm not saying it's the cause, but vibration can seize a bearing as much as lack of lube.
01-09-2010, 06:39 PM
#26
JK Super Freak
I think alot of it may be the caster. What was your caster set at? I know it was recommended to me that I run about +6.0 to +7.0 deg of caster. Mine is at +6.2 because with my Teraflex upper longarms as short as they will get, that's where my caster is at until I lengthen the lowers. The issue I thgink is that with the caster set that high, it makes it much more difficult to properly set the pinion angle on these non-cv joint aftermarket driveshafts that have the u joints or double cardan joints on them. The u-joints are much more succeptible to vibes, weather you can feel it or not, when the pinion angle isnt near perfect. A cv driveshaft is more forgiving in that area, and wont have the vibes at higher angles like the non cv ujoint shafts. On my buddies JK the highest we could really get the caster while having the proper pinion angle for his tom woods shaft was about +4.5deg.
01-14-2010, 01:15 PM
#27
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I think alot of it may be the caster. What was your caster set at? I know it was recommended to me that I run about +6.0 to +7.0 deg of caster. Mine is at +6.2 because with my Teraflex upper longarms as short as they will get, that's where my caster is at until I lengthen the lowers. The issue I thgink is that with the caster set that high, it makes it much more difficult to properly set the pinion angle on these non-cv joint aftermarket driveshafts that have the u joints or double cardan joints on them. The u-joints are much more succeptible to vibes, weather you can feel it or not, when the pinion angle isnt near perfect. A cv driveshaft is more forgiving in that area, and wont have the vibes at higher angles like the non cv ujoint shafts. On my buddies JK the highest we could really get the caster while having the proper pinion angle for his tom woods shaft was about +4.5deg.
01-14-2010, 02:02 PM
#28
JK Super Freak
I just went off the write up I saw and recommendations on here of caster settings with my lift and 35" tires to be -6 to -7 deg. It was in the 3 deg range and handled bad on the highway, real light, flighty feeling ion the steering. Set in to -6.2 deg and its gone. Rides great and steers like it did before.