thanks guys yer its 3.9 borgwarner 68 rear end i reckon it used to be around 3500 at 100km/h with the 13 inch tyres

dd seems that it wont cause much harm sittting that high rpm its just sound like the engines screaming of its head LOL.

with the 12 inch it spins the wheels every corner if you kick the clutch a bit which is fun and take of is abit better imo hehe.

Thanks seems the old a12 can take it :)