The car will not be put in his name until he pays the last installment
Question

                I want to buy a car and the price will be paid in installments. The way in which it is sold is that I make a down payment, then I pay installments monthly, and after I pay the last installment, the car will be turned over to my name, knowing that the last installment will be the same as the usual installments .
Praise be to Allah.Firstly: 
There is nothing wrong with 
    buying by installments, whether you make a down payment or not, subject to 
    the condition that the contract is free of any stipulation of penalties to 
    be paid in the event of delay in paying installments, because such 
    conditions come under the heading of riba which is haraam. 
Secondly: 
Once the contract is 
    completed, you become the owner of the car, even if you have not paid any 
    installments yet; the car comes into your possession and its price becomes a 
    debt that you owe. 
Thirdly: 
The purpose of registering 
    the car in the purchaser's name is protecting one’s rights; it is not a 
    condition of the transaction being valid. Ownership of the item sold passes 
    to the purchaser by virtue of the contract, whether it is registered in his 
    name or remains in the name of the seller. 
Fourthly: 
It is permissible for the 
    seller to stipulate collateral in order to protect his rights. He can make 
    the car itself collateral, so that the buyer cannot dispose of it by selling 
    it until he has paid off all the installments. The fuqaha' stated that this 
    is permissible.  It says in Kashshaaf al-Qinaa' (3/189): It is valid 
    to stipulate collateral for the price of the item sold. If he says, "I will 
    sell you this on condition that you keep it as collateral for its price," 
    and he says, "I will buy it and give you collateral," the purchase and the 
    pledge are valid. End quote. 
Based on that, if the delay 
    in registering the car in your name is in order to protect the seller, lest 
    you sell it before paying off the installments, then this does not affect 
    the validity of the sale, because of what we have stated above about the 
    registration being only for the purpose of protecting rights. But you own 
    this car according to sharee'ah, by virtue of the transaction. If it is 
    collateral, then it is not permissible for you to sell it until you have 
    paid off the pledge or are given permission by the seller. 
The Council of Senior 
    Scholars stated that it is permissible for the seller to keep the car in his 
    name for the purpose of protecting his rights, and said: The Council thinks 
    that the two parties to the transaction should do it in the proper manner, 
    which is selling the item and naming it as collateral for its price, and 
    protecting oneself by keeping the contract and ownership papers, and so on. 
    End quote. 
It remains for us to point 
    out that there is a similar method to that which we have mentioned, which is 
    leasing or rent-to-own, in which the one who is renting it out retains 
    ownership of the car until the last installment or rental payment is made, 
    but this contract is haraam. The Islamic Fiqh Council and the Council of 
    Senior Scholars have issued statements concerning this. Please see question 
    no. 14304 
And Allaah knows best.