Eaton FRO 10sp stuck in high range

[powder keg]

I have an Eaton FRO 10 speed that stuck in high range. Riding through town, stopped at light, had to take off in 6th. Any ideas on how much thats gonna cost? Mechanic said the splitter on top seemed to be doing its thing, something internal.

 

[Racer X 69]

Is that one of those "autoshift" trannies? If so it could be electrical. The shift forks are actuated by electric servos that are controlled by the tranny computer. I have seen corrosion in connectors and cuts in wiring that results in corrosion which will interfere with the signals being sent back and forth, and this will result in the gearbox "stuck" in 6th gear.

If it is a purely manual gearbox then it is possible the shift fork is broken, the shift rail detent is stuck, or the splitter has failed internally.

 

[powder keg]

Its all manual.

 

[Scorp]

Do you trust the mechanic? It's easy to have an airleak in the line for the splitter switch and the mechanic tell you it's some $500 part...

 

[powder keg]

Yes, I trust him. I stood there with him while he checked for leaks, he's gonna take it out tomorrow and check it out. I hope I don't have to rebuild the thing, has 765,000 miles on it. Transmission man said rebuild would be around 1700, mechanic said there is an o-ring on the splitter shaft that sometimes breaks, keeping my fingers crossed. Gonna put a clutch in while its out.

 

[diehard]

could your splitter box be corroded? had that happen once. shaft had pits and wouldnt let the arm slide.

 

[boone315]

If you flip the divider, you should be able to hear it switch, if you can't then it is something from there up, if it it does switch then there is a problem with the linkage/gears and that starts getting expensive because because they have to tear into the guts, most trucks have a pretty lengthy drive train warranty, check into that first before going into your pocket,, you can put a clutch in anytime

 

[JM Transmissions]

- Check the shift knob functions and splits the air both ranges

- Check the slave valve is functioning.

- If so, most likely the snap ring that holds the High/low range shift fork has poped off. Common problem. Remove the shift tower and you can check if the snap ring is still in place.

- If the snap ring is there, check the air cyl in the underside of the shift tower. The rubber piston wears out.

- check with a prybar that you can move the range fork manually into both hi/low range

- last, strap the rear box countershafts and remve the entire box for inspection.

 

[powder keg]

Thanks for the replies.

 

[boone315]

The bill is in the mail, we round up to the nearest hour

 

[JM Transmissions]

Any luck with the trans?

 

[powder keg]

Not back yet. The 95 cent snap ring is in, I told them to put a clutch in while the trans was out and the pilot bearing was frozen. This boogered up the shaft and when he was replacing the shaft he found the drive gear was also boogered up. Hope to have it back Monday.

 

[JM Transmissions]

The input shaft in an FRO is a very snug fit in the drive gear... cant count how many times Ive seen guys break the snap ring groove that holds it in place while trying to get the input bearing out :S So the snap ring for the hi/low had popped off?

 

[Dayripper]

when i have a clutch put in i allways replace the input shaft and pilot bearing.
but then again my clutch is 900 bucks.allways cost me around 1800 for a clutch job

 

[powder keg]

Yes, original problem was broken snap ring on the shift fork. Replaced the input shaft damaged by the frozen pilot bearing. Replaced the drive gear. New clutch. Back on road.