Transmission Troubles T5 93 Mustang 5.0 Tail Housing Cracks

[Bluestang93]

My 93 mustang hatch 5.0 5 speed keeps cracking tailhouseings and I've been through 2 now and cannot figure out why

 

[RaggedGT]

Not much to go on- but my first thought would be-
-Vibration(s), many causes here, a couple would be Bad U joints, unbalanced driveshaft, bad pinion bearing..
Is the car lowered ?
If it's lowered could it be jamming the driveshaft into the trans.
Is it the original driveshaft to the car?
Is the trans mount in good shape?
Does the car make a bunch of power?
Wish I could be more help,hopefully some of my suggestions might help you. Hang tight and smarter people will pop in with things to check etc. lol

Like maybe @Boosted92LX ,he may have an idea

 

[Boosted92LX]

I think @RaggedGT hit most everything I could think of off hand. Bad output bearing maybe allowing excessive runout leading to stress cracks. Maybe pinion angle binding the u joints.

 

[Boosted92LX]

Does the car shake like heck above 55 mph?

 

[MFE92]

Poly trans mount with stock rubber engine mounts?

 

[Bluestang93]

The car is basically stock not lowered pretty sure it is original driveshaft only upgrade so far is a cold air intake so not a ton of power just replaced trans mount

 

[Bluestang93]

And about the shaking yes it does it shakes super bad from 55-85 and then stops after 85

 

[RaggedGT]

And about the shaking yes it does it shakes super bad from 55-85 and then stops after 85

I would try putting the car up on jack stands (all 4 wheels off the ground) and let the car idle in gear. Watch for a wobbling/bouncing driveshaft or whatever is vibrating

 

[Bluestang93]

Ok will do I got a new tail shaft housing for it an I'm going to put that on this weekend don't currently have the car it's 80miles away at my dads house

 

[Boosted92LX]

The stock driveshafts in these cars were trash. Very bad about vibration. The only known cure is the aluminum ford racing shaft. (Common fix) I put one in my car and it was smooth as butter afterwards. That vibration will tear upall sorts of stuff.

 

[Mustang5L5]

And about the shaking yes it does it shakes super bad from 55-85 and then stops after 85

I'm gonna guess your driveshaft is very out of balance


Sent from my big ass iPhone 6 using Tapatalk

 

[FF-DC00]

I'm having the same issue with my 00 mustang 3.8 v6 stock T5 I bought the car and had to have a clutch, flywheel, throw-out bearing, and clutch fork replaced and it ran fine for about 6mo. them it cracked my Tail housing, drove it home and vibration started. I had the trans rebuilt with a new Tail housing and had it installed took a road trip it was vibrating at idle, in natural, in gear didn't get better or worse. on my way home 1,200 mi round trip I got about 150, miles from home and it cracked again I'm lost at what caused it.

and I checked my GPS on the trip with my speedometer @ 75mph, GPS showed 113mph I'm aware that the speedo is misaligned but that was the transmission shop
please help
THANKS Dylan

 

[RaggedGT]

Vibration. Vibration caused it- driveshaft out of balance or something internal just a shimmying lol