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DeeDee,
As recommended by U, Caltex CL-90 Oil has been used in Gear which took 6.5 liter, front & rear differentials which took 2.5 liter each. Engine Oil has been also changed. Points noted for next tuning 
The tough job is still in process – Brakes, it’s not giving pressure to the wheels. Left rear wheel cylinder was a big question mark, nipple was also not bleeding the oil,
My Brother has taken over the Punga Project for next couple of days, He went to Mog Killer & found a clean rear cylinder & will replace it shortly. Front diff lock nipple was also not in good shape so he found that as well. Few other things he purchased is new Master Cylinder (he still in the opinion to Fix the Brake on genuine system initially & then go for servo - to avoid a double paddle servo :)). Engine Exhaust had cracks & it was not delivering a sweet sound, he has got that as well from there, Original chain grip to mount the extra wheel in dala, 24v Temp gauge for engine & Fuel gauge + Speedo Meters (original which are larger in diameter, will share the snaps).