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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 11-24-2010
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Default md 3060p w/retarder

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  #2  
Old 11-24-2010
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Quote:
Originally Posted by Mike Hohnstein View Post
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The plan is to screw in a 5:57 rear gear, drop Jacobs 'tarder and Brownie and craft a d/shaft assy that will take the 3500 rpm @ 85 mph.
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  #3  
Old 11-24-2010
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Quote:
Originally Posted by Mike Hohnstein View Post
The plan is to screw in a 5:57 rear gear, drop Jacobs 'tarder and Brownie and craft a d/shaft assy that will take the 3500 rpm @ 85 mph.
Nice Mike. Clean work.
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Old 11-24-2010
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I did not know a retarder was available for a 3060. Is that option available for any 3060? Does the 3060p identify a different model than I have in my BMC?

Do you need an adapter to bolt it up to the 3208 or is there already a bell housing available?

I will follow this thread with interest.
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Old 11-24-2010
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this will be a good thread.
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  #6  
Old 11-24-2010
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I was paging through the Allison manual that came with theSafari and saw the retarder mentioned in there as well. Wished we had it instead of the PacBrake, sounds like a more useful item from what little I've heard, not that we'd ever retrofit one but it's interesting to learn about. Besides the transmission mods needed, don't they require additional cooling?
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  #7  
Old 11-25-2010
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I bet an allison retarder is way more money than a Pac Brake!!,
Like,a small suitcase full!
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  #8  
Old 11-25-2010
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I imagine it is Hydraulic operated so it might produce heat. I suppose all that energy has to go somewhere.... so since you are slowing down the tranny is not generating at least at that moment any heat for forward momentum so I suppose there would be no general gain of heat?
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  #9  
Old 11-25-2010
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The retarder is splined to the output shaft, accumulator is required to charge the retarder when applied. Obviously cooling capacity will have to be improved some what, but that will be a work in progress as my FC has the biggest radiator I could find that fit in the hole. The trans was in a on road field sprayer, 3208 powered, got the lever shifter, wiring loom, ecm and all the engine side parts. However, the trans didn't come w/retarder and the planetaries were scrap. I wandered over by the local Allison people, on second shift and asked the shop super about some retarder parts, he pointed over by the dumpster and said take that one, I'm ready to scrap it any how, a case of beer would be nice. Complete unit, had been sitting out side for a looong time, valve body junk but the rest of the parts all good converter too. Life is good sometimes, but not always.
I got to open the wallet for a accumulator, heat exchanger and some wiring loom for the 'tarder. Over haul parts are big dinero, gaskets, clutches, etc. Will represent 4/5 grand less labor, gear change and drive shaft parts it will be a few bucks, but it should be pretty neat,,,if it works good.
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  #10  
Old 11-25-2010
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Thanks for the back ground info. Now I see how you put this together. I am impressed by your resourcefulness and will watch this thread with great interest. I am confident this thread will have a lot of hits.
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