How to customize Isuzu truck

ISUZU
Engine: 
ISUZU 4HK1-TC Diesel
Intercooled turbo, water-cooled, 4 cylinder in line, direct-injection, common-rail
Displacement 5, 193cc
Max. Output 129kW (175PS) / 2, 600rpm
Max. Torque 500N. M (60.7kg-m) / 1, 500 ~ 2, 000rpm
Compression ratio 17.5± 0.6: 1
Transmission: 
ISUZU MLD 6Q
Powerful yet economical and easy to handle. Reliability and durability you can count on. 
6 speed manual. Synchromesh on gear 2-6. 
Gear ratios
1st 2nd 3rd 4th 5th 6th Rev
6.72 4.244 2.58 1.54 1.000 0.763 6.823