Author Topic: Differantial MC9 Auto 8v71  (Read 6577 times)

Offline Nineforever

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Differantial MC9 Auto 8v71
« 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
Hyway 3 100 klms south of Yellowknife NWT Canada

Offline lostagain

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Re: Differantial MC9 Auto 8v71
« 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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Offline RJ

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Re: Differantial MC9 Auto 8v71
« 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. . .

 ;)
RJ Long
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Offline Ed Hackenbruch

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Re: Differantial MC9 Auto 8v71
« 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.
Used to own a 1968 MCI 5A with 8V71 and Allison MT644 transmission.

Offline luvrbus

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Re: Differantial MC9 Auto 8v71
« 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 »
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Offline Ed Hackenbruch

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Re: Differantial MC9 Auto 8v71
« 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. ;D
Used to own a 1968 MCI 5A with 8V71 and Allison MT644 transmission.

Offline uncle ned

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Re: Differantial MC9 Auto 8v71
« 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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Offline B_K

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Re: Differantial MC9 Auto 8v71
« 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.
;D  BK  ;D

Offline RJ

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Re: Differantial MC9 Auto 8v71
« 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!

 :D
RJ Long
PD4106-2784 No More
S13406 1978 MC-5C Converted 6V71/MT-644
S14947 1980 MC-5C Shell 6V92/HT-740
Cheney WA

Offline Nineforever

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Re: Differantial MC9 Auto 8v71
« 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
Hyway 3 100 klms south of Yellowknife NWT Canada

Offline wg4t50

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Re: Differantial MC9 Auto 8v71
« 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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Offline B_K

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Re: Differantial MC9 Auto 8v71
« 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!
;D  BK  ;D

Offline Nineforever

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Re: Differantial MC9 Auto 8v71
« Reply #12 on: November 07, 2013, 05:42:24 PM »
Thanks for all the help members
Hyway 3 100 klms south of Yellowknife NWT Canada

Offline luvrbus

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Re: Differantial MC9 Auto 8v71
« 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
Life is short drink the good wine first

Offline wg4t50

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Re: Differantial MC9 Auto 8v71
« 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  ;D ;D
« Last Edit: November 07, 2013, 06:13:54 PM by wg4t50 »
MCI7 20+ Yrs
Foretravel w/ISM500
WG4T CW for ever.
Central Virginia