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Transmission Discussion of preventative/corrective maintenance and other technical issues regarding your coach's transmission.

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  #1  
Old 10-13-2008
gcyeaw's Avatar
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Default The tranny in the bus goes bump-bump-bump

Second update try..
We went to Gilbert Lake State park near Oneonta NY a week ago. Then headed down to Shanes rally in Hershey and left for the Addirondaks on Friday morning. All went well till I was puling out of a Flying J after a fuel stop. The trans seemed to jump in and out of gear once, but that was it. Then as I left the station and turned uphil it began jumping in and out of gear (first) at half second intervals. I tried to pull over but it seemed too stressfull on the drive train so I stopped.

The police insisted that I try to get over further, but I made about 5 feet with the bumping going on and stopped.

Good Sam got a tow truck and we followed to Stadium International Truck in Olyphant PA. It was late Friday night so nothing could be done till Monday. I still don't have a diagnosis, but should have one by Tuesday.

Anyone know anything about Stadium Truck?
Got any suggestions on the tranny problem?
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Last edited by gcyeaw; 10-13-2008 at 05:01 PM.
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  #2  
Old 10-13-2008
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Well they are an authorized allison transmission service dealer so you cant go to wrong.


The problem sounds to me like low fluid. Have you checked it lately? Did you check it after the coach stopped? In any case removing the allison tranny is quite easy on the FC especially if they have a lift. Keep a sharp pencil ready when they tell you what is wrong and how to correct it. If this is a keeper coach the labor is not to much more to rebuild it.

good luck
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  #3  
Old 10-13-2008
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Tom,
I check the fluids regularly. When it failed I was on an upward incline, but checked the fluid anyway. It did not show on the stick so I bought the last two quarts from the Flying J and added it. Then it showed on the tip of the stick. There was no fluid leaking or on the undercarriage that I could see, so I assume it was likley ok. The tranny temp was fine.

I would assume it is a control circuit/spring/valve. If it was bad bands or clutches it would slip and probably not grab. I did put in in reverse with the brakes on and gave it a little throttle, it didn't bump, but it did in drive. That pretty much covers the torque converter I think.

I am hopeing for an experienced guy to know what he is looking at. I would bet an in-frame fix will be a **** of a lot cheaper than an Allison reman swap. Remember, I am an out-of-state RV guy in a truck shop in PA. Not always the best negotiating stance.

Did I mention that the tow guy was pretty knowledgeable and was careful, however, the seal he used on the axel leaked and the rear of the coach is drowned in oil, not to mention my Jeep. We followed them to the truck shop and my wife said it looked like rain on the windshield.
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  #4  
Old 10-13-2008
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my first thought was low fluid level also,lets hope its something easy (cheap).
keep us advised gardner.
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  #5  
Old 10-13-2008
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rear end gear????????

bumping...........in and out is a spider or something stripping~!~

them allisons are tough!!!!!!!!!!!!

rear ends are weak!!!!!!!!
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  #6  
Old 10-13-2008
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Definitely not a gear problem, for sure in the tranny.
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  #7  
Old 10-13-2008
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Quote:
Originally Posted by rwoody View Post
rear end gear????????

bumping...........in and out is a spider or something stripping~!~

them allisons are tough!!!!!!!!!!!!

rear ends are weak!!!!!!!!
Wow!! Wise Old Woody comes thru again.

I second the motion on Gardner's read end
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  #8  
Old 10-13-2008
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its easy to check,watch the driveshaft and put it in gear,if the shaft turns its the rearend.
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  #9  
Old 10-13-2008
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If you drop your tranny into drive while still moving backwards even at a very slow speed you chance stripping the teeth on the rear end. You are putting a tremendous amount of torque on those teeth doing that.

Believe it or not Gardner I believe its easier to work on the tranny out of the coach and it can be done in about 30-45 minutes. I watched it done on mine here in Vernon when I had my friend change the rear main seal on my previous 1982 FC35. Guys that work on allisons a lot have got it down to a science. And with a lift its even easier.

To help your stress level a little. Stadium International is not just a little truck stop. They have branches in PA and NY and have very well equipped shops and excellent mechanics. Why dont you call Dave Hellock the service manager at 570-941-3600 first thing in the morning (7AM) and ask him?

good luck
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  #10  
Old 10-14-2008
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Tom,
I'm ahead of you there. I spoke to Dave on Friday. I checked on the Allison site had they are official, although not on the MT6xx sseries.

As far as the stripped gear thing, it is NOT a stripped gear. If I put it in reverse it seems OK.

I spent two years in a school for auto mechanics including automatic transmissions back in the pump and piston days. We even got to look at a new fangled thing called an alternator.
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