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EFV-8 Club Forum / General Trucks Discussion / Non-Synchromesh transmission

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Barney
11-06-2019 @ 5:26 PM
Member
Posts: 17
Joined: Nov 2015
          
Hi John,
I agree with 'Carcrazy's' basic, to-the-point explanation - matching input (engine speed) speed to output speed (driveshaft speed). You mentioned you usually have no problem shifting, but occasionally you have trouble. My guess is you have trouble when on a hill. When traveling uphill, you're probably more hurried to shift; when traveling downhill you're probably less hurried to shift. But it's counter-intuitive. When shifting going uphill, you need to shift at a slower rate. The truck (driveshaft) will slow down faster, thus you need to wait a bit longer for the engine speed to slow down more so to match the input/output speeds. Conversely, when shifting going downhill, the truck (driveshaft) may slow down very little and may even accelerate, so you'll need to shift quickly before the engine speed (input) slows down too much. Have fun practicing, Barney

jyakel
04-26-2020 @ 6:34 AM
Member
Posts: 59
Joined: Oct 2014
          
Hello Carcrazy, Allanwoodieman, Cliftford, 37Ragtopman, f1Ford 48, Charlie Stephens, and Barney and all that responded to my non-synchro transmission thread here. I apologize that I have not been back to visit this thread for a while but the new posts/responses from all of you are greatly appreciated. Let me pick your brains a bit more here. Here is what I know:
1. When the truck (and tranny) are cold it shifts much better. Almost like the trans oil is thicker (due to the cold) and adds a bit more coating of oil to the gears, hence shifts smoother? Possible? Not possible? Comments?
2. When the tranny warms up there is more 'slop' in the gear shifter. When shifting, I listen very carefully to the engine and the whine of the tranny (straight gear trannies do whine a lot, a sound I love by the way) but like Allanwoodieman says, I try not to think about it, I just do it, and most of the time it shifts okay. I find that if I up-shift at lower speeds everything works better. If I get to 4th gear at 20-25 mph then everything is fine. I have been told (probably by one of you) that non-synchro trannies are meant to get to 4th gear asap and then stay there all day. The high ratio rear end on my truck allows me to stay in 4th gear even as low as 10 mph-as long as I am easy on the truck, which I am. The only problem with that is that everyone else in the world is in a hurry. So my slow starting F-3 is only driven on back roads, never a principle highway.
3. Finally, Barney called this one right on the money: when I am shifting going up hill it shifts fine. When shifting going down hill is when problems arise. Sometimes I simply cannot find 4th gear when going down hill. The tranny will grind and resist any attempt to engage in 4th gear. So here is what I have done in that situation: a. I try to shift to 4th gear even sooner than normal, b. I sometimes start moving in 3rd gear (down hill remember) then quickly get to 4th gear, or c. sometimes start in 2nd gear and skip 3rd gear and go directly to 4th gear.
So, comments, advice, help?
Thank you,
John


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