I'm switchn from a m6 to a built 700r4 and it has the electronic speedo, i was wondering how bad off my speedo will be when i get it up and running or if i have to change the gears in the tranny to get even close...I figured it may could just be tuned out to read right...Thanks n advance!

 

If it has the electric speedo with a reluctor wheel and sensor then you should have no problems with the speedo, and anything in the ecm programming that reads VSS signal.
That is after you change the program from the 17 tooth M6 vss to the 40 tooth A4 vss (pulses per minute in the programming)

The 4L60E and later 700R4 put out the same pulse per minute.

There are different type of 700 speed sensors though, but as long as you have the type with the 40 tooth reluctor wheel, it'll work just like a factory 4L60E.

 

K thanks, it is the 40 tooth relucter wheel, so all it should take them is a simple change with hp tuners then. This swap is going easier than i thought LOL!