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The fastest I have been in my 456 geared 1009 with 33 inch tires is 70mph spinning at 3300 rpms.At the same speed in my 308 geared 1009 I was just turning 2200 rpms. Also with 33 tires.This was with GPS, don't even look at the speedometer, never right..

I use a gear calculator at Summits website.Just look at any set of ring and pinion gears,scroll down to gear calculator and enter info.Lots of fun.

Your tires are 33"s so if you were going 70mph you were pulling about 3250 rpms,not terrible but I wouldn't run that high very long.

Filled the 86 1009 today, 16 mpg,not enough for me.Definitely see a regear and 700r4 upgrade in future.

A 1008 with 456 gears with 31" tires will be at 3459 rpms at 70 mph.Thats close to redline...33s@3250 rpms,35s@3064 rpms.You have been here long enough to know our speedos are never correct,gps that baby at 70mph and check tach.

With my 86 1009 I usually keep it below 3K rpms,right around 60 mph by GPS,4.56 gears and 33"tires.I checked mpg recently as was surprised to get 16.8 mpg.My 85 still has 308s and gets driven up to 80 mph sometimes.

Thankyou CUCVLOVER for this topic.It got me thinking about gears and OD.A vehicle with 4.10 gears and a .75 OD would be right around 3.08 gears in OD.With 33s.With 3.73s it would be like 2.79 final ratio.I wonder what the optimum rpm range is for mpg?

Using a gear ratio calculator a vehicle with 4.56 gears,31 tires traveling at 65 mph would be pulling 3212.59 rpms.A vehicle with 3.08 gears ,31 tires at 65mph would be at 2169.91 rpms. Same 3.08 geared vehicle at 2500rpm comes out to be 74.89 mph. A 3.08 vehicle with 33s at 75mph the rpms...

1009 with 33x10.5s,GPS,not unusual for me to run 75mph on interstate,have had her well over 80mph.MPGs really suffer over 65mph on mine.