i have a 97 1.6 8v and it wont stay in 5th gear, when held it eventually makes a shitty noise! i was wondering if a 16v gearbox would be ok or are the ratio's completely different? shall i jus stick to an 8v box? im asking this because i cant find many 8v box's and loads of 16v boxes.

also to change the subject.. is it possible to bolt a 16v head straight onto an 8v block?