Car shakes horribly when i let off 70-75 and 105-110

It's Deff behind tranny because its speed related. Not gear/rpm

Have no clue. Only have a few issues left.

Had axles fixed by dss. Not issue.

Rebuilt whole ford 8.8 kit. (I did switch to the Detroit tru-trac) (http://m.summitracing.com/parts/dtl-912a563) possible issue ?

Mounts seem fine all over

Changed wheels and tires. No issue.

Maybe drive shaft ? It's a very violent shake. Even shakes in neutral in the rear.

 

Eaton tru trac description (Description: These Eaton Detroit Truetrac differentials use a patented design of parallel-axis planetary helix gears to provide a quiet, automatic splitting of torque. They perform like an open differential under normal driving conditions, automatically transferring torque to the wheel with better traction when ground conditions warrant.)

 

it shakes in neutral as well? are you sure the mounts are alright? when you say neutral... you are still at speed I would assume. something silly like alignment?

 

Yep still at speed. And I guess I will have to get an alignment. They are free for me anyways

 

sounds like it could be diff mounts, check that the urethane hasnt pulled through the mounts, mine did a while back, redid them with huge washers on the ends

 

Does DSS have a center support bearing on their drive shafts? If so I would check that.

 

Well. It's not alignment. Disnt seem like mounts either. Hmph maybe ill throw it on the lift and look again

 

If its violent it could be the driveshaft.

 

Sounds similar to a driveshaft issue to me. If you push the clutch in and it's still doing it, it's obviously behind the trans somewhere.

 

didn't yours do this onDyno

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