Trans woes

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Model T Ford Forum: Forum 2017: Trans woes
Top of pagePrevious messageNext messageBottom of page Link to this message  By Gale Bray on Wednesday, July 05, 2017 - 11:45 pm:

Got band linings changed. Adjusted linkage as per instructions. Truck jacked up, but forward and reverse pedals don't move wheels, although they engage (inspection plate off and watching driven gear while pedaling). Aux chevy trans will engage with grinding gears. I don't know what else to do or where else to look. Drums are spinning while truck is running. Reverse pedal reverses driven gear, but wheels don't engage. Help?


Top of pagePrevious messageNext messageBottom of page Link to this message  By Mark Gregush Portland Oregon on Thursday, July 06, 2017 - 12:04 am:

Have you run and driven your TT, is this something new?
How do you know the low or reverse drum is/or is not turning, if you took the cover off the transmission while the car was running you would be wearing a lot of oil.
The driven gear is at the other end of the transmission, what you are talking about is the tail shaft assembly(tail shaft and drive plate). With the engine not running you will see the clutch through out moving back and forth when you press the low pedal down or pull the parking brake lever back.
Engaging is not the same as gripping the drum preventing it from turning. Do you have the low pedal adjusted so it's about 1 1/2" off the floor when fully depressed? Which drums are turning? Transmission or brake?


Top of pagePrevious messageNext messageBottom of page Link to this message  By Gale Bray on Thursday, July 06, 2017 - 01:33 am:

Yes, pedal is adjusted as is linkage. Cover was off, although oil splashed (top of opening deflects oil back onto bands and clutch spring etc.), I was not covered with oil. All three drums turn while engine idling. There is something that turns on the backside of the driven plate/brake drum (clutch collar?) that turns one way in forward and reverses when reverse pedal is depressed, but the rear wheel or wheels do not turn. Engine slows while engaging pedals like it is under load, but wheels do not spin. Wheels only spin while auxillary trans is in gear.


Top of pagePrevious messageNext messageBottom of page Link to this message  By Gale Bray on Thursday, July 06, 2017 - 01:41 am:

I have driven T, but only with aux trans. Band linings were only present in patches, so I installed new linings and adjusted pedals and forward pedal linkage thinking this was why truck would not move with T trans only, and aux trans grinds while shifting at any speed or stopped. Thought clutches might be stuck, but it engages and disengages, but doesn't move rear wheels on T trans only.


Top of pagePrevious messageNext messageBottom of page Link to this message  By Patrick-Ypsi, MI on Thursday, July 06, 2017 - 07:45 am:

it sounds like the Aux. trans is shot or needs rebuilt. If it's bad no amount of work to the original T transmission will get the TT rolling. You could remove the Aux transmission, but then you would need to install a different (longer) driveshaft.

Patrick
Ypsi, MI


Top of pagePrevious messageNext messageBottom of page Link to this message  By Charlie B actually in Toms River N.J. on Thursday, July 06, 2017 - 08:16 am:

If the aux trans is grinding gears it's turning to that point at least. The question is where does it stop. Did you change the bands because it stopped moving? I realise, because of their described condition they needed replacing but did it stop moving before the change over? Believe this is what you're saying. If so something has let go either in or after the aux trans.


Top of pagePrevious messageNext messageBottom of page Link to this message  By Bill Harper - Keene, NH on Thursday, July 06, 2017 - 08:33 am:

Hi Gale,

You haven't mentioned what kind of aux transmission you have in your TT. Most aux transmissions have a true neutral position and when in neutral the vehicle will not move no matter what you do with the Ford transmission.

Also, because the Ford transmission does not have a "conventional" clutch (like a Model A for example) shifting gears in the aux transmission often results in a bit (or more) gear grinding. Some folks select a gear in the aux and keep it in that gear for the trip, stopping the car/truck to select a different gear.

Hope that this helps. Good luck with your project, Bill


Top of pagePrevious messageNext messageBottom of page Link to this message  By Chadwick Azevedo on Thursday, July 06, 2017 - 10:22 am:

When you go to shift your aux depress the brake pedal to stop the forward trans shaft from spinning. This is assuming the car is stationary.

Often with an aux trans in neutral there isn't enough resistance to stop the output of the T trans from spinning.


Top of pagePrevious messageNext messageBottom of page Link to this message  By Mark Gregush Portland Oregon on Thursday, July 06, 2017 - 10:26 am:

In order to use the T transmission it need to be in one of the 3 speeds. As slow as the TT's are anyway, most likely needs to be in 3rd or high which is 1:1 direct.
I went back are re-read, he has a Chevrolet transmission.

(Message edited by redmodelt on July 06, 2017)


Top of pagePrevious messageNext messageBottom of page Link to this message  By David Sullivan on Thursday, July 06, 2017 - 11:35 am:

Can you remove a plug in the rear axle and see if the worm is turning? Then check for broken axle shaft. Dave in Bellingham,WA


Top of pagePrevious messageNext messageBottom of page Link to this message  By Jerry VanOoteghem - SE Michigan on Thursday, July 06, 2017 - 11:52 am:

Gale,

You say, "Wheels only spin while auxiliary trans is in gear."

That makes sense. It's not like you have the choice of using one or the other. The aux. trans must be in gear in order to use the T trans.

By the way, if you don't also have auxiliary brakes, you're flirting with disaster.


Top of pagePrevious messageNext messageBottom of page Link to this message  By Gale Bray on Thursday, July 06, 2017 - 02:16 pm:

Well, you all answered my question...the aux trans has to be in a gear for movement. What Jerry said about having aux brakes makes sense too. In low gear, this truck isn't slow though. For about 50 years it was used to haul boxes of prunes, then grapes in its later years, so you would think a granny low would have been essential. But, even in low, it moves right out.


Top of pagePrevious messageNext messageBottom of page Link to this message  By Jerry VanOoteghem - SE Michigan on Thursday, July 06, 2017 - 04:18 pm:

Gale,

Is it possible that the transmission is installed backwards to make an overdrive? This would not be uncommon.


Top of pagePrevious messageNext messageBottom of page Link to this message  By Mark Gregush Portland Oregon on Thursday, July 06, 2017 - 08:15 pm:

Must be because even with TT high speed rear end would still not be that fast in Ford high and Chevrolet direct (3rd).


Top of pagePrevious messageNext messageBottom of page Link to this message  By Dan McEachern on Friday, July 07, 2017 - 09:40 am:

Try putting the aux trans in gear before you start the engine or push the brake pedal down to stop the output shaft from turning with the t trans in neutral. With an aux trans, you have to stop the output shaft from turning- the drag from the clutch plates will still let the output shaft spin- even with the t trans in neutral.


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