Originally Posted by dawson1112

Like stated check your linkage .
When in drive starting from a stand still if it runs out normally with no slipping , and shifts out though all the gears, then its something in the linkage.


When your in drive and you take off the trans automatically selects first gear , then 2nd then drive , then overdrive.
Placing an automatic in 1st gear effectively just prevents it from shifting into any other gear until you place the shifter there.
Now if you place the trans in drive and floor it it should take off and feel firm, if your rpms climb yet the trans feels slushy and you barely move then I would say you have an internal trans problem.
I think your linkage is off just enough that when you select first it is not quite locking in and your probly actually stuck in between 1st and 2nd .