I've now put photos of our rig on photopage. Check it out.
Thanks for so much useful information, especially to Dr Steve, Jim & Tim.
Usbusin (Gary D) - another "Gary", the ratios you mention are almost the same as the transmission I've now got.
A used engine/transmission importer in Melbourne located the exact box I needed in USA, and I now have it here in Oz ready to be changed over. It is a Spicer 1372 A. 1300 ft-lbs torque, 7 speed non-synchro. Any way who needs synchro - I don't use the clutch going up, only to start from stationary & change down. I'm very lucky, as you never can be sure with an import what the condition is like inside, but the gearbox reconditioners just lifted the top cover & resealed it. All I need is a new clutch & can of oil! Just waiting for my diesel mechanic to have time to help me with the changeover.
Tom C, This Spicer is still only 1:1 in 7th, and with 12R-22.5 tires I'm doing 100kph @ 2050rpm. (Governed @ 2100rpm) Would like to get my revs down to 1750-1800 @ 100kph. Diff is currently 4.11. What should I change it to - 3.9?
Denning (Gary J)