what causes a driveshaft to pop out on a 4x4 sierra cosworth apart from hard accleration
front driveshaft that is

 

If the car is too low or have suspension that doesnt stop the car to compress too much. Typical on left hand turns when you hit a pothole or something at the same time.

 

only mine come out and had a new one in on sunday have done 20 mile and it has come out again doing 40mph in a straight line on the dual carriage way
the chap who fitted it says it is very rare that two should come out

 

Must be something else. Do you have the right TCA,s? Are you sure about engine mounts? Is it the right driveshaft?

 

well im new to the cosworth scene thats why i took it to the my local tuners
dont really no much about it
all he said was that my lower wishbone bushes are worn and need repalceing at some point
nothing else has been done
car drove sound before i expect one driveshaft to go as the car has done 90000 miles but not 2 in the space of 20miles
yes it was the right driveshaft so i was told

 

If the wishbone bushes are VERY worn, the make the wheel go out to the side more than it should. Maybe that could be the problem? Have you pushed the engine up from underneath and checked the engine mount bush?

 

no mate havent checked the engine mounts they look ok
there isnt any play in the wheel though
have checked them both sides and they are fine

 

As above,my money would be on engine mounts m8

Had exactly same prob as you,after 3 driveshafts got smashed to bits I found out eng mounts were fooked

Put a trolley jack under sump and jack it up slowly,the whole car should start to lift,what will probably happen is that just the engine will lift up

Mine looked fine too looking at them from above

 

Had same problem fitted Vibra-Tenics engine mounts and XR4x4 shafts

with no troubles at all

 

have heard that people fit normal 4x4 sierra shafts to cure this(see post above)