John, another option that works out great is to retire the 65 year old diff entirely, and slide in a later model with lower mileage which already has the ratio you're planning on driving. Depending on what T5 5th ratio you're running (.72 or .86) you'll find a 3.42,3.73 or 3.08 respectively, are some ratios that might work for you.
Being able to cruise your 235 along at 65-70@ 2000rpms is pure music to your ears!
Dave
