Trying to figure out how my 8.8 got toasted

benulis55

NAXJA Forum User
Location
pottsville, pa
Heres the weird thing, it was FINE until my rear driveshaft u-joint snapped, which bent my transfercase output shaft, cracked the bellhousing on my tranny.

Now the 8.8 is toast, (i am opening it up today to see how bad) and i cant help but think that i chipped a tooth or broke a tooth when that damn u-joint snapped. the 8.8 was perfect before that

could this happen? could a u-joint failure cause the ring and/or pinion to be damaged?

the u-joint that broke was the one closest to the 8.8 input yoke

anyone have 8.8 4.10 gears?
 
When the u-joint broke it transferred alot of energy into the pinion gear. This has been known to break ring or pinion gear teeth. It also puts a huge radial load on the pinion bearings and could possibly have bent the pinion gear. It's likely the housing is O.K. but it sounds like it's time for a rebuild of the gears/bearings.
 
My guess is the 8.8 broke 1st, locked up and cracked the bellhousing before the u-joint snapped. Lets see some pics once toy open it up.

I'm not sure which came first, the chicken or the egg, but I would put money on the 8.8 blowing up first and taking out the rest.
 
no, the u-joint snapped, now the 8.8 is noisy as hell....some serious grinding going on. the u-joint was very bad, clicking and knocking for a long time before it broke....obviously my fault for not replacing it sooner

the 8.8 still drives, i think it just chipped a tooth...i drove it last night and today, it just makes grinding sounds wen i let off the gas
 
sounds like a good reason to go to 4.88
 
I wonder if it might have somehow damaged the trac-loc.
 
no, the u-joint snapped, now the 8.8 is noisy as hell....some serious grinding going on. the u-joint was very bad, clicking and knocking for a long time before it broke....obviously my fault for not replacing it sooner

the 8.8 still drives, i think it just chipped a tooth...i drove it last night and today, it just makes grinding sounds wen i let off the gas

Count the teeth, bet there are 2 or 3 missing, but they don't go far.
 
When the u-joint broke it transferred alot of energy into the pinion gear. This has been known to break ring or pinion gear teeth. It also puts a huge radial load on the pinion bearings and could possibly have bent the pinion gear. It's likely the housing is O.K. but it sounds like it's time for a rebuild of the gears/bearings.
X2, same thing that happens when you break a axle shaft.
 
ill be opening it up this weekend to see what the damage is

whats the crush sleeve? thats related to the pinion bearing somehow right? sorry i am unfamiliar with gears
 
Its the spacer between the front and rear pinion bearings.Its used to set the bearing pre-load.
 
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