transmission not correct

[jaypcee]

I got a junkyard tranny ,from a good source, it came out of the same year and model 88 E350 C-6 but i cant get over 60 mph. can anyone help.

[Doug Rodrigues]

We need more information as to exactly what is happening. The transmission isn't shifting into third gear or the engine doesn't have any power, or the transmission slips....what?

[jaypcee]

It's not the engine, it is new. I know for sure it is shifting into all the gears. I was wondering if it is possible the transmission was geared different than the previous one. The van I have was a custom order van in 1988 and was purchased with many options. Such as engine and tranny oil cooler to pull trailers with so I thought maybe the rear end might be different.

[ModMech]

ALL C-6s are 1:1 in third, all. There are NO variations.

You are not getting into 3rd. ANY Ford engine even with the steepest gears they made (4.11) will run 70-80 MPH in "D" if it's really in 3rd. Otherwise they are screaming about 55 in 2nd.

[Doug Rodrigues]

I'm with ModMech on this one. While you're at it, I hope that you're not overspeeding your engine in second gear? That's how you bend connecting rods!