Posted by Charlie on February 19, 2000 at 01:27:39:
In Reply to: 6-spd. tranny ideas posted by Ed Trethewey on February 18, 2000 at 18:19:15:
Yes! The Eaton/Fuller FSO-6406A.Ratios: 7.05, 4.13, 2.52, 1.59, 1.00, 0.78, reverse 6.75. SAE#2 bellhousing, 356 lbs, case length approx 20" (NP420 is ~9.75"). If mounted behind a typical 4 cyl diesel like a Cummins 4BTA or a Perkins 1004TA Phaser, It would require drivehsaft shortening of approx. 7.5-8" to keep transfer in same location. I found out recently there are custom 4WD-oriented driveline shops that will run splines all the way back through a yoke, allowing a center of u-joint to u-joint distance as short as 5".
They can be gotten from truck drivetrain jobbers, not cheap since it's a relatively new item, about $2500 outright. But really important in optimizing the power output of an engine like a Cummins. What do you have in mind?
There is also an Eaton-Fuller RT610 or RT6010 non synchro 10 speed. It is about 1-2" longer, same weight, very narrow ~1.28:1 splits all the way up from about 7.5:1 to direct and then an overdrive of 0.79. Similar price. You'd typically start in 4th. Really too many gears in the lower range, you don't need narrow splits till you get near the top.
Charlie