gear box swap help

[luckyflush14]

lookin for some info guys and gals ive not long bourght a 1988 325i sport due to the fact that i crashed my 1990 4dr 325i se (****) so my question is can i use the gear box from my moor door and swap it in to my sport because the problem is that they are both running dynoed at 210bhp but as the sport has close ratio box it aint got the legs like my 4dr and im a legs man yes the sports got the off the lights performance but come 3rd gear my 4dr will say good buy to most sports models you see i do a lot of motoway miles and the sport will run at 100 mph no props but it sits over 4000rpm but cams open so say good buy to the fuel were as my 4dr will sit at 100mph all day long at 3500rpm cams not open so i save loads of fuel so can i do a strait swap or is there any thing i need to do or know any help would be most greatfull many thanks and a happy new ......
scott..

[ross2009]

boxes are the same so it would be a straight swap its only the ratios that are different

[kilrone]

gearbox swap wont help as only the first three ratios are different,you need to swap the diff or just change the ratios.

[ross2009]

gearbox swap wont help as only the first three ratios are different,you need to swap the diff or just change the ratios.

yeah what diff you got in it i bet its some thing like a 4.10

[luckyflush14]

thanks lads new dif coming my way