Transmission throws out of gear

[Babyblue93]

It would be greatly appreciated if anyone had some andvice on my situation. 1993 cheyenne 4x4, 350 and TH350 trans etc... I had a 4l60E in the truck and swapped it with the TH350. my problem is prior to doing the swap and still exists when I give my truck a decent amount of gas and or slam on the accelerator my trans will throw itself from drive right into neutral mostly if its at a stand still. My truck has done it when the
4L60 was installed and still does it now with the TH350 so im looking for some guidance in this situation. thanks.

 

[badazzbulldog]

sounds like a bad trans mount or motor mount and when you accelerate its twisting against the linkage moving it to neutral

 

[Fobroader]

I was just going to say that, my t-case on my jeep used to jump out of gear when I flexed out the jeep because the mount would twist and push the lever forward into neutral.