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FC (Forward Control Unique Issues) If you have a unique issue with your FC model coach and it can't be answered in one of the other forums here, then this is where you can list it.......List your FC Parts here too.

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  #1  
Old 11-22-2011
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maustin maustin is offline
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Default FC 2 speed rear axle

There has been a lot of talk about FC gearing and transmission possibilities. I have concerns about the MT643 high temps when climbing at full power in a gear that the converter does not lock (1 + 2). A little more speed on the flats would be nice without running the engine up to the governor. If I was certain that I would NEVER sell, I'd install a manual gear box.

How about a 2 speed rear axle? How would it get along with the automatic?

Maybe a 5.29:1 low range for climbing and a 4.44:1 for the flat lands. Can a guy build such a thing?

I'm not up for an engine/trans swap but I'd like to cruise with the CAT at a little lower rpm and climb in 3rd with a locked converter most of the time.

Any thoughts?
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  #2  
Old 11-22-2011
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Mike H has a bolt in 2 speed auxiliary transmission. Everything you would need to make it happen to include an air shifter.
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  #3  
Old 11-22-2011
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Quote:
Originally Posted by Rick View Post
Mike H has a bolt in 2 speed auxiliary transmission. Everything you would need to make it happen to include an air shifter.
Its a 3 speed Brownie,underdrive,direct and overdrive.
He has it and all the stuff to install it.
He also has most of the stuff to put a 10 speed road ranger in an FC,for lots of gear shifting fun!

There were 2 FC's built that had 2 speed rears in them,wonder where they are today?
Also,Lucas out in Ca. has installed a 2 speed rear in his early FC,he was telling me about it at the Grand Canyon rally.
It was not cheap,i remember that.
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  #4  
Old 11-22-2011
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Two speed rear gear needs a whole different axle, the Rockwells WL used don't take a two speed carrier. That's why I did the Brownie box. You guys that want gearing should consider the deal I have, proven and ready to bolt in. MUCH easier to install this deal that changing rear gear. I know, done both.
I have EVERY THING to bolt in a 10 speed, FRESH 6610 Roadranger, clutch, flywheel, shifter AND master cylinder/clutch set up. 4.11 rear gear w/the Roadranger would be quite the highway flyer. Didn't do it 'cause I tripped over the stuff to install the MD3060, but that's a little out of line cost wise for most FC projects. $2500 for either of these set ups is a very cost effective upgrade, shipping is cheap.
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  #5  
Old 11-22-2011
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Mike,can you tell us the different ratios?
With the box in overdrive and a 5.29 rear gear whats the final ratio?
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  #6  
Old 11-22-2011
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4.54 in OD.
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  #7  
Old 11-22-2011
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so,5.29 in direct and 4.54 in OD.
Perfect for an FC.
Did i hear you say $2000 for all of it?
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  #8  
Old 11-22-2011
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I'd take that, add a little to prep for shipping.
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  #9  
Old 11-23-2011
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Mike, that sounds like a perfect setup. I put a two speed rear end on my '63 Blue Bird Conversion (gas model). It was electrically operated and replaced the 6.71 rear with the GMC v6 401 with a 5.5/7.5 rear with the GM v8 455.

I was shooting for the 5.5 due to rpm differences in the motors and thought the 7.5 would give me some outstanding hill climbing ability as the bus was so under powered.

One thing I noticed was that the resulting affect was the same gearing but did add one lower and one higher gear. In other words 2nd on one ratio seemed to be 3rd on the other. So I really didn't turn my 3 speed tranny into a 6 speed as hoped. Seemed to simply add a granny and an over drive.

I can see where your setup would be much nicer with the stock gearing and the ability to go over/under that.
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