Hi .
PLZ : I need from your help to me and I like for advise to me !
my ask to you is : I have skyline gtsx 89( coupe ) cases kcr / R 31 ORIGINAL ENGINE RB 30e carburetor !! I change engine and FIT it RB25DET AND GEARBOX( TRANSMISSION) FROM GTS ECR /R33 !!
( WHAT IS the type the suitable differential fit it ) ?? for that engine & gear box ? for the racing street and bitter bower ,, top speed and response ( only modify : dump pipe and complete exhaust system 3 inch ,,air filter intake and change big intercooler kit( i mean changed OEM small intercooler use it !! stock engine and turbo etc . ( PLZ : I need know suitable differential for the engine and gearbox direct fit it ON THE gtsx 89 R31!! ( low RPM ,,TOP SPEED and high speed !!
(( because original differential not good and not enough ? (differential number 10,000 ,39 Rack!
example : 3000 rpm and speed meeter 140 KM !!
Thank you for your time .
Best regards .