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Author Topic: Transmission repair or replacement 8V71 4 speed Detroit Diesel MCI 7  (Read 2069 times)
dchilds
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« on: October 17, 2012, 07:36:04 AM »

We are in Laughlin NV - From NC.  Our MCI 7 Detroit Diesel 8V71 has a cracked transmission.  We need to get advice on who in this area works on these engins.  Thanks for any help that anyone can offer.
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ol713
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« Reply #1 on: October 17, 2012, 09:08:27 AM »


  Hi;
     Sorry to hear of oyour troubles.   I also have a MC-7.
     If you can get to Las Vegas,  call Bob at B&B bus
     conversions.  If he can not help you then he will know
     who can help.
     I don" have a phone number for you.   Will try and look
     it up and repost it.
                                Good luck,   Merle.
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Van
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89' Silver Eagle 15/40 6V92MUI Boulder City,NV




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« Reply #2 on: October 17, 2012, 09:20:55 AM »

Maybe Clifford will jump in, as that's his neck of the woods (desert) until then maybe these folks can help  http://www.greatwesttruckcenter.com/?PageData=25930
 Where exactly are you, are ya'll dead in the water? There is also B&B Coach up here in Vegas, give Gary a call 702-873-4415. Please keep us posted Wink

    Van
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ol713
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« Reply #3 on: October 17, 2012, 09:31:14 AM »

 Hi;
     I looked up some info for you.
     I assume you have a 4sp spicer in your coach.
     The info for B&B coach works is;
                           Gary  & Sandy Bennitt
                           4350 s. Arville St.
                           Las Vegas, Nv.
                           702/873-4415

     Another contact is;
                        HB Industries
                        9762 Silva Rd
                        El Cajon, Ca
                        Bob Rowsell  
                        619/561-9048
                        888/725-4461  

      Another contact is;
                        Don Fairchild   -- - -  Bakersfield
                        He had a spicer 4460 for sale.  He also
                        might know some one to install it for you.
                        Some one else on this board might have
                        a phone number for him.
                        Let us know how all this turns out.  
                                   Good luck,   Merle.  

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luvrbus
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« Reply #4 on: October 17, 2012, 09:53:33 AM »

A&A Diesel in Mohave Valley about 20 miles from you 65 bucks a hr fwiw 928-768-4311 ask for Andy tell him I said call

good luck
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bevans6
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« Reply #5 on: October 18, 2012, 01:38:21 PM »

Man, I am sorry I didn't have my computer for the last two weeks.  I literally just threw out a perfect Spicer 4 speed case, completely stripped, two days ago.  I got $25 for it from the salvage place.  I spent a morning stripping out all the gears so I could get the "dirty aluminium" price.  I would have happily given it to you for fun and giggles...

Brian
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1980 MCI MC-5C, 8V-71T from a M-110 self propelled howitzer
Spicer 8844 4 speed Zen meditation device
Vintage race cars -
1978 Lola T440 Formula Ford
1972 NTM MK-4 B/SR
John316
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MCI 1995 DL3, DD S60, Allison B500.




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« Reply #6 on: October 18, 2012, 01:51:23 PM »

A&A Diesel in Mohave Valley about 20 miles from you 65 bucks a hr fwiw 928-768-4311 ask for Andy tell him I said call

good luck

DC, first off sorry to hear about your troubles.

Second off, a little education. "Luvrbus" is Clifford aka bus "Yoda". If he says something, you can go to the bank on it. In this case if he suggest A&A, you can't go wrong with them. So you would tell them that Clifford told you to call.

Hope you get it fixed quickly.

John
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MCI 1995 DL3. DD S60 with a Allison B500.
Lin
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1965 MC-5a




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« Reply #7 on: October 18, 2012, 03:24:27 PM »

I think I have a Spicer at Don's in Bakersfield, but it would need the clutch rebuilt.
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« Reply #8 on: October 19, 2012, 08:07:08 AM »

Sounds like the right time to install an Allison HT740 automatic.  Good Luck, TomC
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Tom & Donna Christman. '77 AMGeneral 10240B; 8V-71TATAIC V730.
dchilds
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« Reply #9 on: October 22, 2012, 03:31:05 PM »

Thanks for all of your responses. We have the trans out and are currently looking for a housing.  Appreciate all of the leads.  DC
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RJ
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« Reply #10 on: October 22, 2012, 10:47:43 PM »

DC -

If you might be contemplating an automatic, I have a friend who's got a used, but dyno'd, HT-754 five-speed Allison available.  It's out of an MC-9 that was owned by a well-maintained fleet in CA.

Send me a PM and I'll get you his contact info.

FWIW & HTH. . .

 Wink
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RJ Long
PD4106-2784 No More
Fresno CA
beatsworkin
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« Reply #11 on: October 23, 2012, 09:11:24 AM »

 RJ if DC is not interested in that Allison 754 I could be.  Also what is the 5th gear ratio?

Red
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Stormcloud
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« Reply #12 on: October 23, 2012, 10:15:50 AM »

FWIW I just installed an MT654 in my MC7 that previously had a Spicer 4 speed standard.

I had to install a different accessory drive housing on the rear of the 8V-71 to accept the larger ring-gear, which then required a custom-machined adapter for the smaller rear main seal to fit.

We also had to modify the rear mounts that bolt to the accessory drive housing.

My 4 belt-driven DN alternator wouldn't bolt up on the new drive housing, so it was replaced by a 100 amp 24 volt unit, belt driven off the front of the engine. Pretty much everything else just bolted up.

I replaced the 2 rear doors of the engine bay with 1 large door skinned with expanded metal, and installed a Hayden 2305 transmission cooler there. It cools the transmission well so far, but the acid test will be this winter on our return trip from Brrrrrandon, Manitoba to Yuma. I didnt want to dump the heat from the automatic into the MC-7 rads which are apparently borderline with a standard transmission.

I still have the Spicer 8844 transmission sitting here.....with a used clutch, and assorted parts. It's a long way from you.
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Mark Morgan    near Brandon, Manitoba, Canada
1972 MCI-7     'PapaBus'  8v-71N MT654 Automatic
TomC
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« Reply #13 on: October 23, 2012, 11:51:28 AM »

Red-whether it be a HT740, or HT754, the high gear is 1:1.  Only the 4000 series has a .74 and .64 overdrive.  I looked into installing the HD4060 in my truck, but it would have been $10,000 more, and then you'd have an electronic transmission.  The HT740 is probably the most dirt reliable automatic ever made.  The HT754 is also reliable-but a bit more delicate because of the extra gear.  Good Luck, TomC
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Tom & Donna Christman. '77 AMGeneral 10240B; 8V-71TATAIC V730.
Dreamscape
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« Reply #14 on: October 23, 2012, 07:56:56 PM »

And I thew a good one away a few months back, couldn't give it away then.

We went with an Allison 740, the best decision we could have made. It also meant a shorter driveline, which we had to have made complete new from scratch. Have put on about 500 miles since we made the swap and it runs great!

Now my DW doesn't have to listen to me talk like a sailor when I shift it! Grin
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Becky and Paul Lawry, On The Road
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Our coach was originally owned by the Dixie Echoes.
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