My transmission scares me

kyle4501 · October 19, 2009, 09:26:33 AM

There is a difference between firm shifts & hard shifts.

Firm shifts will allow the clutches to slip less (last longer) & heat the transmission fluid less.

Hard shifts lead to broken parts. Like clutches, gears, the rest of the drive train, engine mounts. . . .

belfert · October 19, 2009, 09:34:04 AM

Quote from: kyle4501 on October 19, 2009, 09:26:33 AM
There is a difference between firm shifts & hard shifts.

Firm shifts will allow the clutches to slip less (last longer) & heat the transmission fluid less.

Firm shifting is a better description of what was happening to my Ford tranny after the upgrade. I couldn't find the right word before I guess.

I'm not sure how to determine the difference really.

Garymci5 · October 19, 2009, 10:03:54 AM

A better trans fluid will surely help cold vs hot shifting characteristics and make it last longer, too.

When I lived in Wisconsin, during the winter, my bus wouldn't go over 50MPG foot to the floor until the auto trans, axle and engine warmed up 10 miles later- and the tires would finally become round again.

That's when I realize just how much power oil can rob and switched to AMSOIL. I shudder to think how long it took to build oil pressure,even in non-extreme temps...

If anyone is interested I can help you buy it at wholesale, which will save alot.

Cheers,
Gary

wal1809 · October 19, 2009, 10:12:16 AM

Quote from: kyle4501 on October 19, 2009, 09:26:33 AM
There is a difference between firm shifts & hard shifts.

Firm shifts will allow the clutches to slip less (last longer) & heat the transmission fluid less.

Hard shifts lead to broken parts. Like clutches, gears, the rest of the drive train, engine mounts. . . .

I tend to agree with you on this one. The shift I am experiencing when not all the way on the fuel pedal is not right.

luvrbus · October 19, 2009, 10:13:51 AM

If you have a 740 your modulator is out of adjustment do you have a air throttle some install a air throttle with the manual modulator it will work but needs a fine adjustment.
The Allision doesn't have to shift hard it is a fairly easy job to set the trimmer springs , valves and shift points when you are changing the oil.
I have a 740 and people that have rode in my bus will tell you that you don't notice it even when it goes into lockup.
When I get back to the coach I will PM my cell # we are in the Austin area often

good luck

John316 · October 19, 2009, 12:12:24 PM

Quote from: Garymci5 on October 19, 2009, 10:03:54 AM
When I lived in Wisconsin, during the winter, my bus wouldn't go over 50MPG foot to the floor until the auto trans, axle and engine warmed up 10 miles later- and the tires would finally become round again.

Cool, Gary. I would love to even get a quarter of that

. Got any tips, for the rest of us

. 10 MPG would be great for me.

God bless,

John

wal1809 · October 19, 2009, 04:42:18 PM

Here is the info plate on the side of the tranny

This part is hanging down

wal1809 · October 20, 2009, 08:00:53 AM

Bump for the day. does anyone know what that part is. It is hanging down alongside the transmission and looks as if it has been undone for quite some time. On the very end is coupler with threads. It was full of grease and dirt so I know it has been there for a while. The bus originally had a manual tranny and was later swapped with the Allison 4 speed modelMT654.

luvrbus · October 20, 2009, 08:05:58 AM

Wal1809, that is your problem Kim builds a great transmission but he will not adjust the trimmer springs for a smooth shift as he builds the same for different applications
Take to Dallas Tx to Inland (Industrail Transmission) they can make it shift smooth and that part you are looking at is the speedometer drive
good luck

wal1809 · October 20, 2009, 08:15:34 AM

Hello LUVRBUS I am confused. Who is Kim? My speedometer does not work in the bus. Can this one be changed to fit the Allison? Can u pm me your telephone number. I promise I will only pain you for a little while with questions.

Busted Knuckle · October 20, 2009, 08:21:14 AM

Quote from: wal1809 on October 20, 2009, 08:15:34 AM
Hello LUVRBUS I am confused. Who is Kim? My speedometer does not work in the bus. Can this one be changed to fit the Allison? Can u pm me your telephone number. I promise I will only pain you for a little while with questions.

The tag shows AZ transmission & engine exchange.
I told you Clifford knows any & everybody who's anybody in the bus world!
Kim would be who built your transmission @ AZ transmission & engine exchange.

wal1809 · October 20, 2009, 09:22:00 AM

Ahhhh you weren't BSn were you?

wal1809 · October 20, 2009, 10:15:09 AM

I called out to AZ and spoke with Kim's son. We talked about it and his suggestion was to attempt to adjust the air module on the side of the tranny first before taking it to a mechanic. He said to take it off and place another o ring in there and then put it back. SO here goes.

Just Dallas · October 20, 2009, 10:32:34 AM

Removed

DaveG · October 20, 2009, 03:42:17 PM

What a great bunch of guys!