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Author Topic: Differantial MC9 Auto 8v71  (Read 1867 times)
Nineforever
Nineforever
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« on: October 30, 2013, 05:25:53 PM »

Do any members know of a source for rebuilt or new diffs for MC9 there not available threw MCI .
Thanks
Dave
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Hyway 3 100 klms south of Yellowknife NWT Canada
lostagain
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« Reply #1 on: October 30, 2013, 06:13:38 PM »

I still have the 4:11 gears that I took out of my 5C a couple of years ago. I don't know if they would fit into a MC9 pumpkin, but they might.

JC
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JC
Invermere, BC
1977 MC5C, 6V92/HT740
RJ
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« Reply #2 on: October 30, 2013, 09:30:28 PM »

Dave -

Sam Caylor may be your best bet, in Rantoul, KS.  Not sure of his contact info, but somebody else will pop up and share.

FWIW & HTH. . .

 Wink
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RJ Long
PD4106-2784 No More
S13406 Now
Fresno CA
Ed Hackenbruch
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« Reply #3 on: October 31, 2013, 06:20:08 AM »

Sam's phone number is 785 878 3405. He might have the parts you need but when i talked to him a week or two ago he said that anymore the buses that he is parting out are all about 10 years old or newer.
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1968 MCI 5A with 8V71 and Allison MT644 transmission.  Western USA
luvrbus
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« Reply #4 on: October 31, 2013, 06:30:10 AM »

Pro Gear and Transmission in Orlando FL or Global in Houston will have a rebuilt section shipping will probably be $$$$$ surely someone in Canada can rebuild yours

 Ed, Sam has been saying that for years but he still can manage to find parts for older buses if the price is right  
« Last Edit: October 31, 2013, 06:33:45 AM by luvrbus » Logged

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Ed Hackenbruch
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« Reply #5 on: October 31, 2013, 06:51:38 AM »

Clifford, i just got a couple of things from him for my 5 from the one that he is parting out now. I know he is saving a couple of things off of it. Grin
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1968 MCI 5A with 8V71 and Allison MT644 transmission.  Western USA
uncle ned
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« Reply #6 on: October 31, 2013, 06:58:10 AM »



  I got to spend a day with Sam at Blytheville.  One of  the best days a bus nut can have.

Between him,RJ and Mr. vickers was a great week end.

uncle ned
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4104's forever
6v92 v730
Huggy Bear
B_K
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« Reply #7 on: October 31, 2013, 12:40:10 PM »

What gear ratio you need?
I have an '85 96A3 (same as a 9) we are starting to part out that has a good one in it.
Grin  BK  Grin
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RJ
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« Reply #8 on: October 31, 2013, 09:35:20 PM »

Between him, RJ and Mr. Vickers ,was a great week end.

Even Huggy enjoyed the attention, too!

 Cheesy
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RJ Long
PD4106-2784 No More
S13406 Now
Fresno CA
Nineforever
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100 klms south of Yellowknife NWT Canada




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« Reply #9 on: November 03, 2013, 11:23:19 AM »

Im not sure of the gear ratio , long legs pretty lazy on the hills would be nice to find a source for a rebuilt or a new one here in Canada . I have a donner 9 here in my yard i could use the diff out of that one but not sure how much life in it , if need be thats what ill do .
Thank you
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Hyway 3 100 klms south of Yellowknife NWT Canada
wg4t50
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« Reply #10 on: November 03, 2013, 12:00:13 PM »

If staying with the 8V-71, stay with the 3.73 rear gear, if your headed to the 8V-92, the 3.33 works fine.
BTDT
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MCI7 20+ Yrs
Foretravel w/ISM500
WG4T CW for over 50 wpm for ever.
Central Virginia
B_K
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« Reply #11 on: November 03, 2013, 02:44:44 PM »

If staying with the 8V-71, stay with the 3.73 rear gear, if your headed to the 8V-92, the 3.33 works fine.
BTDT

Yup that's pretty much my take on it! BTW mine is a 3.33!
Grin  BK  Grin
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Nineforever
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« Reply #12 on: November 07, 2013, 05:42:24 PM »

Thanks for all the help members
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Hyway 3 100 klms south of Yellowknife NWT Canada
luvrbus
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« Reply #13 on: November 07, 2013, 05:50:29 PM »

I am a fan of the 3:33 or 3:36 with a 740 behind a 8v71, 3rd gear becomes wicked you actually can get up a hill better and faster with the 3:36 than with a 3:73
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wg4t50
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« Reply #14 on: November 07, 2013, 06:08:47 PM »

luvrbus,
With the 23,000lb rear, I never changed the rear gear set after I totally rebuilt it, stayed 3.7, just used the RT910 then the RTO910, if I had the money, would have loved the play the 3.33, the key to the MCI rear gear is to stick with the 10 tooth pinion.  Have forgotten the name of the factory rep for that rear, he had the MC7 also, claimed with the 10  tooth pinion, you have the very strongest gear setup. Just different ring gear tooth count  for different ratios.
He & I had a very interesting talk about how to tell if damage to the rear was warranty or abuse.
Have been lucky to have met some very talented guys and got some stories  Grin Grin
« Last Edit: November 07, 2013, 06:13:54 PM by wg4t50 » Logged

MCI7 20+ Yrs
Foretravel w/ISM500
WG4T CW for over 50 wpm for ever.
Central Virginia
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