Help Johanna replace the gearbox and return to work

I make my living with my delivery van. 6 weeks ago the gearbox failed, and the mechanic says the repair will cost $1,350. Without the vehicle I earn nothing. I have been borrowing from friends to pay rent, and now I have run out of people to ask. I support my two daughters and my mother. Before the breakdown I worked eleven hours a day, six days a week. I have been offered extra shifts for the next three months if I can just get the vehicle working. I have a written estimate from a certified mechanic and will upload it here. All money will go toward the parts and labor on the estimate, with a small amount for road tax and insurance renewal. Where the $1,350 goes: • gearbox replacement (parts): $770 • Labor charges: $290 • Road tax and insurance renewal: $250 • Towing and inspection: $40 Ask me anything below before you decide. I'd rather you were sure.