Caja Caja Nissan Cabstar

Hello friends. I have problems with gearbox in Nissan Cabstar, I cannot reduce from third to second march when the car is running. When the car comes the box allows me to put a second march. With a stopped vehicle I can reduce without problems. Someone can tell me that you can fail. Please.

Hello friend, in the mechanical gearboxes your problem is common, the boxes have some pieces called chickens These pieces are normally bronze and the work of these pieces is to stop the speed axis of the current revolution to zero so that the pinion that is in motion chin Another back of the same pinion for the reductions Your 2nd chisronizer must have spent my recommendation is to disassemble the box that is simple vast in that model and remove the chisronizers and change them all change the previous and posterior seals of the box and observe the bearings as they are at the time of assembling it washes all the pieces and assemble the box and place new oil 80W/90Sae Honestly
greetings and that you are fantastic