Fresh New Engine - Need help trouble shooting

[jaxncurtis]

Hey guys, I just installed a fresh new 250 inline 6 engine. Started it this last week and did the first breakin and was able to get the timing set pretty much perfect. She runs GREAT!!

I never put it in gear to drive it... up until today...

I put it in gear and the truck will not go any faster than 5mph with the pedal to the floor!!

What could be the issue here? Do I have the kickdown cable two loose? Too tight? Anything else you can think of?

Im certain nothing is wrong with engine as it is running great!

Im new to installing engines so please bare with a newbie...