Michael morunga 1 Posted April 12, 2019 Hi will a 1996 el falcon 4 speed auto trans fit behind my 1988 xf falcon4.1 crossflow motor my 3 speed auto is broken and want to up grade to 4 speed auto???? Share this post Link to post Share on other sites
deankxf 20,231 Posted April 12, 2019 24 minutes ago, Michael morunga said: Hi will a 1996 el falcon 4 speed auto trans fit behind my 1988 xf falcon4.1 crossflow motor my 3 speed auto is broken and want to up grade to 4 speed auto???? if your diff ratio is 2.92 or 2.77 you wont benefit from a 4 speed auto anyway. but they don't fit. the crossflow is quite good at getting the same fuel economy with no overdrive. when i had mine and fitted a 5 speed manual it got the same economy and just was quieter in 5th(less exhaust noise from the sports exhaust) if you wanted a stronger trans, the C4 came out on some 6cyls , it's still 3 speed but is better. however the BW40 when in good condition and fitted with a decent trans cooler are plenty good enough(the BW51 supposedly better still, which were fitted to EFI crossflow(change kickdown cable for carby), some late model XF utes 1991 + and EA 3 speed auto falcons. which would need the extension housing and bell housing swapped and kickdown cable ) Share this post Link to post Share on other sites
Michael morunga 1 Posted April 12, 2019 Thank you for your feed back I'll go to manual option kool. 1 deankxf reacted to this Share this post Link to post Share on other sites
Mr Polson 10,214 Posted April 14, 2019 however the BW40 when in good condition and fitted with a decent trans cooler are plenty good enough(the BW51 supposedly better still, which were fitted to EFI crossflow(change kickdown cable for carby), some late model XF utes 1991 + and EA 3 speed auto falcons. which would need the extension housing and bell housing swapped and kickdown cable ) EFI xflows still had the BW40. Was only EA and 88+ XF (ute/van) that had the BW51. The EFI BW40 is different internally but will still work fine behind a carby motor (and vice versa) 1 deankxf reacted to this Share this post Link to post Share on other sites
deankxf 20,231 Posted April 14, 2019 25 minutes ago, Mr Polson said: EFI xflows still had the BW40. Was only EA and 88+ XF (ute/van) that had the BW51. The EFI BW40 is different internally but will still work fine behind a carby motor (and vice versa) i wrecked two ZL EFI fairlanes that had 51s but that doesn't mean they weren't changed later in life they are pretty extinct these days anyway, i cant remember the last time i saw an EA Share this post Link to post Share on other sites