[bone z]

has any one had a 400 explode mine developed a whine and a slight shake at about 50 mph and higher but it shifted fine was rebuilt about 1500 miles ago so i stopped by the trans shop and picked up the trans guy to go for a ride to see if he could tell me what he thought got on hi way brought it up to about 55 and boom it broke the case in two places broke drive shaft in two took out cross member brake cables exhaust teeth on starter and ring gear dented new floor pan took it out today will find out what let go soon and havent opened rear yet but will take a look too

 

[Big White]

Well Vin, the bad news is, your transmission blew up. The good news is, your transmission rebuilder was with when it blew. Hopefully, he is a stand-up guy and is willing to make good on his not-so-good rebuild. Good luck. Hope that you make out OK.

 

[PCB67SS]

Wow Vin sorry to hear about your terrible day.....I know its hard to think positive at a time like this but thank goodness you were not hurt.....Hope you don't find any more damage and good luck on putting it back to better condition than it was. The only time I have seen any thing happen like this it started in the rear and worked its way forward.

 

[dashboard]

Vin,
In a way it's a good thing. I can't count the number of times I've taken the service guy for a ride and the car ran fine. Drop him off and the problem returns.

 

[Motorvation]

I'm with Bill....Starts with driveshaft/ rear end problem, vibration cracks case and things fall apart....Good luck and speedy repairs to you.....

Steve O.

 

[MEJ1990TM]

That is too bad about your transmission and everything else that was wiped out. Hopefully it will be back on the road ASAP.

 

[BillyGman]

has any one had a 400 explode mine developed a whine and a slight shake at about 50 mph and higher but it shifted fine was rebuilt about 1500 miles ago so i stopped by the trans shop and picked up the trans guy to go for a ride to see if he could tell me what he thought got on hi way brought it up to about 55 and boom it broke the case in two places broke drive shaft in two took out cross member brake cables exhaust teeth on starter and ring gear dented new floor pan took it out today will find out what let go soon and havent opened rear yet but will take a look too

Did you recently do, or have had any other work done to the car such as a rear gear swap, or driveshaft replacement? What rear gear ratio is in there?

 

[bone z]

no didnt have any thing done it started whineing first and was for awhile then viberation started at hiway speed like i said it was shifting fine and checked rear last week just for the heck of it everything looked great pinion lash oil was clean nothing lose and put another drive shaft in with new joints and it didnt change anything

 

[BillyGman]

no didnt have any thing done it started whineing first and was for awhile then viberation started at hiway speed like i said it was shifting fine and checked rear last week just for the heck of it everything looked great pinion lash oil was clean nothing lose and put another drive shaft in with new joints and it didnt change anything

Did the new driveshaft you put in have the same length, and the same diameter as the one that was replaced? And was it made of the same material, or was something changed?


You say that you checked the the rear. Was a new crush collar used? New pinion bearings, or old ones? And what did you set the pinion bearing pre-load to when you put it back together?

 

[BillyGman]

I'm just wondering if you had a pinion bearing failure which maybe caused a chain reaction causing a domino effect in your drivetrain. And if the pinion bearing pre-load was set wrong, that would be a suspect if it was set shortly before the whining noise began. But that possibility only applies if you or someone else had the pinion bearing out of the rear, or if the pinion nut was atleast loosened when the rear was being checked out.

And if you installed a used crush collar, that would definitely be suspect. I'm not sure what your knowledge level is on these things, so I'm speaking about basics in case you aren't aware of them.