Outer Limits 4x4 Board

Im hopfully going to swap my 4.11 for some 4.6s out of a 2.8 turbo GQ .The info i need is how to calculate rpms and speeds as the other guy is looking to lower his rpm while i want to up mine and give me lower low range but he wont swap if its going to make his car to hard to start of on road he is running 33s on a 2.8 and says he is doing about 2800 for 100km/ph while im doing about 1900 to 2000 rpm for 100kms/ph please help as a straight swap would be so cool

try this

http://members.optusnet.com.au/~zerosin/gearcalc.html

% difference between gear sets 12%. Mult or divude current speed or revs and you will have your answer.

Bazzle

Dunk
I calculated it at work today. It works out to approx 90%.
Therfore it will be a RPM drop at 110kph of about 300rpm.

Cheers
Marty
Ps:Thanks for the replies