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

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  #61  
Old 09-13-2011
NH Bill's Avatar
NH Bill NH Bill is offline
1983 FC 35 "Casa Billisa"
 
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Mike,

That is sounding like a pretty sweet arrangement. Love hearing about this advanced mod stuff. You're right, being in the business sure does seem to have its advantages.

Guess I be living this vicariously through you for the time being and rolling up those hills like a turtle!

NH Bill
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  #62  
Old 09-13-2011
Patric Patric is offline
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Quote:
Originally Posted by Mike Hohnstein View Post
First road trip completed with no problems. This transmission upgrade is by far the best addition I've ever made to any vehicle. 75 mph @ 1800 in 6th, cresting rolling terrain hills @ 70 mph in 5th that brought the bird down to 55 mph with the 643/4.88.
I understand top speed increase - as long as you have enough horsepower to push the air you can go faster on the flats. I am a little lost at your increase in climbing ability. Is the transmission more efficient (more rear wheel horsepower) or is it the ability to precisely hit the peak of the power band for the 3208 that gets you better climbing ability?

Or did I miss something in the thread and you have increased the HP of the 3208?
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  #63  
Old 09-13-2011
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Having closer ratios probably helps in this case!
Ed,this makes me very happy.since we are repowering your 1984 PT 40 with the same trans.
And,if any of you are interested Woodys SP has that same trans too,his SP is priced at $35K.
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  #64  
Old 09-13-2011
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changed rear gear to 5.3 from 4.8, tires are 44 dia. and engine is set at 300 hp. Turbo is a 9Y-1344 from a generator application, makes boost @ lower engine speed. I see 10 #s boost with charge air cooler that reduces boost 3/5 #s due to the cooler air volume. I don't use the turbo boost anoroid on the pump so I get full throttle immediately, that helps a lot.
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  #65  
Old 09-13-2011
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Quote:
Originally Posted by Randy Dupree View Post
Having closer ratios probably helps in this case!
Ed,this makes me very happy.since we are repowering your 1984 PT 40 with the same trans.
And,if any of you are interested Woodys SP has that same trans too,his SP is priced at $35K.
When this engine needs replacement, I got a 8.3 Woody found me ready to screw into my FC. It will be cool, until then I'm ready for some top end with some PT's. I'll be out on the interstates lookin'...........like the time there was a 50 mile top end pass in Montana on I-90, toter vs. Newman/Haas Indy car hauler, he quit first.
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  #66  
Old 09-13-2011
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Extremely cool!!

I love hot rods and hot rodders.

The innovation and creativity is a pleasure to see.

Great to see such a great result!!

Congratulations Mike!!
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  #67  
Old 10-15-2011
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Getting real familiar with I-90. New PS pump pulley works all good, trans continues to make the FC real ground pounder, 1700 rpm @ 70 mph, still a pooch on the grades pulling 10 k #s. Had to spend a couple days in Gillette WY @ the Cummins Rocky Mountain facility dropping out the retarder (bearing failure) and fitting a longer d/shaft. Left there Friday @ 11am, hit the house @ 2 am this morning, had to take it a little easy on some of the road rough spots. Had to replace the rear coolant circulation pump and a hydraulic dry break quick connect fitting, other than that heading for Rats Monday.
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  #68  
Old 10-15-2011
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Mike,
I know you are not one to let maintenance slip, so what was the cause of the retarder bearing failure and is it fixable?

Maybe the 3500 RPM at 85 was too much for it?
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Last edited by gcyeaw; 10-15-2011 at 08:55 PM.
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  #69  
Old 10-16-2011
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I guess it needed more than lots of grease after 30 years, I was concerned about the retarder and it didn't let me down. Looks like another thread related to bearing maintenance coming up. It has occured to me that the pick ups I use for toads are handy to carry the parts that fall off my bus. I'm pretty sure the d/shaft speed is 2700 @ 80 mph.
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  #70  
Old 05-29-2015
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Since the last posting, had the retarder in and out due to bearing failure @ 35 miles, shop tech ran out of talent I guess, seen by TWO Thelma shops, one was in IA, common carrier both ways, neither was able to fix on it, too old they said. SOOO as is often the case, you have to do it your self, the main shaft was modified, lathe work, to allow the use of sealed bi-directional bearing with a 3500 rpm speed limit and maintain the correct clearances.
Test run today proved the retarder is working better than ever and will not need the grease gun as the bearings are permanently sealed, for the life of the bearing, don't know who that will go. Second Thelma tech told me the newer units have such bearings. Celebrated by adding a couple of pounds of 134a to the dash a/c system.
Short story, if your retarder loses a bearing, we have a solution available.
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