Diff ratio

[molus]

Currently running 33in kuhmos. Currently the speedo is out around 9% at 100kph and also want to gear down my low range. Currently have 4.3 diff heads. Was thinking of putting the 4.55 LSD from 2.8l. Am I right in thinking a 6% reduction in speed. And also how will this affect my certification. Thanks

[geeves]

diff ratios not relevent to cert 4.5s can be found in 2.8 Mus and 2.6 petrol bighorns and some 2.8 bighorns. Double check the ration before pulling them out though

[isuzurob]

im running 4.5 with 33 and speedo is just out, was originaly 4.3 with 33 and yes is abit hard on the truck and speedo was way out, speedo now still isnt perfect but made it though cert ok