Gday and welcome,
Check the obvious things first, like accelerator cable opening the carby enough.
if it has a tacho (engine revs) you'd soon see why if its still got the original diff? they were 4.6:1 ratio at the tallest. = about 3800rpm at 100kmh. revving its nuts off compared to a falcon at 2500 ish
i've got a Mk2 transit also(1978 ), it has a modified falcon diff in it around 2.92:1 ratio. good for the highway.(was done in BJ automotive in cheltenham? i believe, hes a Transit wrecker )
while i was in Geelong Differentials recently there was a MK1 transit getting 3.23 ratio fittted to the Original diff, so if its diff ratio only that might be an option.
i'm about to fit a good second hand XE 1982 falcon motor to mine, due to the motor in mine having a suspect burnt valve.
in My opinion you should get a compression test done on your motor(if its a 250/4.1 motor, a stock one will be fine, Transit are lighter than a falcon according to the rego sticker? )
if the motor is fine, it may be just tuning,. but i'd almost bet it will have the stock diff ratio in it looking at your wheels(mine has Falcon brakes and wheels all round after the conversion.)
Edited by deankdx, 15 June 2009 - 11:59 AM.