Need some MC8 differential info

c-coop · July 06, 2016, 03:19:21 PM

when I installed my b500 I didn't change the gears. if I have a head wind while driving around 60-65 mph I simply put it in 5th gear any thing other I run it in 6th. best thing I ever did

luvrbus · July 06, 2016, 05:56:05 PM

Quote from: c-coop on July 06, 2016, 03:19:21 PM
when I installed my b500 I didn't change the gears. if I have a head wind while driving around 60-65 mph I simply put it in 5th gear any thing other I run it in 6th. best thing I ever did

I have friends that tried too use a B500 with 3:70 it drives you nuts pulling a trailer most of those have been changed over to 4:11 to stop the gear hunting and they are getting better fuel mileage with more power in the hills at a faster speed behind a series 60

lostagain · July 06, 2016, 08:14:59 PM

I still have the 4:11 gears on a pallet off my 5C if anyone is interested.

JC

artglass · January 20, 2017, 08:53:53 PM

you still have the gears , they the same for a 8 ? how much you want for them

blue_goose · January 21, 2017, 05:04:48 AM

I have a rear from a MCI 12 with 4:11 gears and as set of gears from a 102C3 that are 3:33 for sale. (Chep-Chep)
Jack

lostagain · January 21, 2017, 06:57:53 AM

I don't know if my 4.11 gears out of a 5C would fit in the rear end of an 8. A 5C and an 8 are very similar buses, like identical other than the 8 is 5 feet longer with a tag axle. The 5 has the drop box, but I don't think it would affect the diff gears. Maybe someone else knows if the gears are interchangeable?

Asking $1500.

JC

luvrbus · January 21, 2017, 07:04:35 AM

JC, the pinion gear is different for a dropbox setup fwiw

TomC · January 21, 2017, 07:28:23 AM

If he's at 2100 at 70mph, then with the B500, he'll have 1554 in 5th and 1344 in 6th. Cruise at 75 and he'll be at 1665 in 5th and 1441 in 6th. Maybe a bit slow, but running an 8V-92TA around 1500-1700 is perfect rpm for cruising. Good Luck, TomC

buswarrior · January 21, 2017, 09:22:16 AM

Doesn't the B500 have a minimum RPM input speed requirement?

Lubrication issues, that was the challenge as the newer engines are designed to run slower and slower for economy?

happy coaching!
buswarrior

artglass · January 21, 2017, 05:28:41 PM

jack you have the whole axle assembly , or just the pig head , anyone know if this will fit in a 8 housing that is for the 4:11

luvrbus · January 21, 2017, 07:06:35 PM

Quote from: buswarrior on January 21, 2017, 09:22:16 AM
Doesn't the B500 have a minimum RPM input speed requirement?

Lubrication issues, that was the challenge as the newer engines are designed to run slower and slower for economy?

happy coaching!
buswarrior

Yes they do but people ignore it and some people get away with it for awhile

TomC · January 21, 2017, 10:59:20 PM

The last 4000RDS (B500 with PTO for trucks) I drove, on partial throttle, it up shifted at 1,500 and didn't down shift until 1,000rpm-from the factory. Good Luck, TomC

blue_goose · January 22, 2017, 04:39:39 AM

Quote from: artglass on January 21, 2017, 05:28:41 PM
jack you have the whole axle assembly , or just the pig head , anyone know if this will fit in a 8 housing that is for the 4:11

I have the head, MCI may be able to tell you if it will fit. Model C 3121F1800
Jack

luvrbus · January 22, 2017, 05:37:41 AM

Quote from: TomC on January 21, 2017, 10:59:20 PM
The last 4000RDS (B500 with PTO for trucks) I drove, on partial throttle, it up shifted at 1,500 and didn't down shift until 1,000rpm-from the factory. Good Luck, TomC

There is a difference between the 4000 series and the B500 the "B" is a bus only transmission it is a $3500.00 upgrade from a 4000 in a Prevost fwiw,plus that Allison is a 5th generation it tells the engine what is needed

TomC · January 22, 2017, 06:36:53 AM

Mainly low profile oil pan.