@Akbar_Khan
i'd suggest Toyota Eastern for the diesel engine rebuild., a rebuild in Nov 2019 of a 2016 Diesel 4x4 Truck at 75000 odo reading operating in balochistan for hauling boulders from mines down to processing area. That truck was seriously abused and roughed in place of a mazda T-3500 truck.
The job at eastern is done technically close to rebuilt by @agoodfriend of his 2D. They got the diesel pump calibrated by CAT workshop.
The 1GD engine diesel complete rebuilt costed 213000. Toyota oem parts from Thailand, pump calibration by CAT workshop in Korangi.
however you need to get everything documented for detail of work & parts they will be replacing new. i suggest read the diesel thread and DIY threads member above.
Also you can pay a visit with your truck to Toyota Southern in Korangi Industrial area - the dha shop is seriously messed up and crooks are working there.