Let me explain the issue in detail...
1. U can change the body of a car/jeep but there should not be any tempering of chasis no... and the shape of the model should not be different..
it means certain shapes of jeeps/cars prolong for 5-7 years..for example prado has same shape from 1994 till 1999..now u can put body of 1999 on 1994 chasis..no one can challenge it as the shape is same.....
2. if u want to change the shape also..like u want to keep the body of 2009 crown on 1990 crown then u must pay the TAX/DUTY of body only (
not complete car) ......in this way ur car will be legal...
3. PESHAWAR HIGH COURT allowed the change of body back in 90s but then this permission was withdrawn..now there are only two ways which i have described above..
i hope this will clarify the issue....