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Old 08-17-2015, 01:20 PM   #161
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Rear engine buses will be harder to find higher gears for.

They use a revers cut ring gear that is only used on rear engine bus application.

Unlike front engine buses that use the same rear ends as every MDT 3 ton truck on the road.

Every rear engine bus I have seen has the 5.29 rear gears.

Nat
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Old 08-17-2015, 01:44 PM   #162
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Thanks Nat!, good info.

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Old 08-17-2015, 01:47 PM   #163
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I have a 4.10 rear end in my 1989 BBAA. I guess it's gold. It's a 23,000 Rockwell. Maybe I will hang onto it for my retirement.
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Old 08-17-2015, 03:46 PM   #164
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I'll be doing some investigating on that here in Houston as time goes on.
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Old 08-19-2015, 07:09 PM   #165
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I Have a Eaton in my Crown & the build sheet says their 4.33
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Old 08-19-2015, 07:21 PM   #166
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Called Thomas here in Houston. They told me it's not an issue. Gave them the V.I.N. and they ran it. They said 4.10s are easy to do. Apparently I have a 5.80-something, 82 or 84. The quote with a two year warranty was $1500 to $2K depending upon whatever else they need to do. However, they also said that price includes changing the speedometer gears and calibrating them, and checking the rear end for any wear and submitting repair requests before reassembly. If I feel rich I might take them up on it.
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Old 08-19-2015, 11:13 PM   #167
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Good to know there are gearing options.
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Old 08-20-2015, 05:48 AM   #168
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My AARE has 4.63, it purchased as an activities bus. It will quite happily run 70.




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Old 08-20-2015, 06:11 AM   #169
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Join Date: Dec 2014
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Knowing the transportation industry like I do I kinda figured there were options, you just have to look. The fact there is a Thomas dealer in Houston makes it a bit easier to find the parts I'm looking for. In addition, these guys also gave me the number and contact info for one of the Thomas parts managers in North Carolina. If anyone has a parts problem/issue, PM me and I'll set you up with the info.

M1031
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Old 08-20-2015, 01:32 PM   #170
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Join Date: Dec 2014
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Year: 1989
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Engine: 3208 CAT/MT643 tranny
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Well, my Cat engine is a 225 hp beauty! Rear end is an Eaton Spicer with a 5.29 gear ratio. Called Spicer, they had to go back to their paper catalogs to find the axle! Nothing like paper to either confirm or deny a rumor....... 4.11s are no longer available due to age from Eaton , however, General Truck Parts in Chicago said they'd look.... Waiting for them to call back.......
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