When od is off...
 

OK so I just got all my bugs worked out with the vacuum leaks&the new t case got 4x4 working&now this has me worried.When I start the truck od off light is always off/ not illuminated which I belive is how the button on my gasser for od was.Well if I push the button on shifter & illuminate the light then take off from a dead stop I feel it shift out of 1st gear but feel nothing else shift wise as I get close to 55 I'm around 3800 rpm no shift.Im expecting it to shift any second & nada. But high revving ,I slow down do the same thing with od button pushed in&all is well.Is this normal? I'm just now learning about these trucks for years all I rode were bikes&sbcs these are a whole new world compared to a small block.So can anyone tell me if this is normal or not.If not what could it be?Thanks BTW it's a 2500 with 4:10 s&only on 33s