Transmission differences?


The workhorse

Golden Jubilee
Golden Jubilee

Posts: 338

Joined: Wed May 29, 2013 6:50 am

Post Thu Jun 29, 2017 12:07 pm

Transmission differences?

Hi,
What is the difference between a synchromesh and constant mesh transmission? I know what a synchro is and does but aren't all forward gears in a synchromesh transmission in constant mesh?
And is a Select-O-Matic transmission an automatic transmission?
Also, it appears from the brochure pages that several different transmissions will fit the 345 V8. If I have a '69 1700 Loadstar 304 or 392 engine with a 5 speed, how would I know if its a T-35 or T-51? (truck made in Canada and no line setting ticket available). And will a T-35, T-51 and T-74 all interchange with my gas V8 or does each trans require its own unique bell housing? I might like to find a T-74 7-speed if it would work with my 5-speed bell housing.
Lots of questions ....
Inquiring minds would like to know ... :-)
Thanks.
trans-engine-options1.jpg
Attachments
trans-engine-options2.jpg

Golden Jubilee
Golden Jubilee

Posts: 8937

Joined: Thu Dec 27, 2012 12:45 pm

Location: Canada's left Coast

Post Thu Jun 29, 2017 2:10 pm

Re: Transmission differences?

I think you should go to You Tube for an animated demonstration of how transmissions work.. Everything you need to know is on You Tube.
I would rather have tools I do not need than to need tools I do not have
Thinking risks being controversial and possibly being offensive

Golden Jubilee
Golden Jubilee

Posts: 338

Joined: Wed May 29, 2013 6:50 am

Post Thu Jun 29, 2017 2:41 pm

Re: Transmission differences?

hi,
I think you did not understand my question ... as shown in the pic below, all the forward gears are always in mesh, although I know power only goes through the gears locked to the shaft by the shift rail ring. So my first question still stands - on the ordering brochures above, the difference between a synchromesh trans where the gears are always in mesh, and a constant mesh transmission - just never heard of a trans called constant mesh before. And I can't find anything on youTube on the T-74 and/or its interchangability with the T-35 or T-51. I can't even find a picture of a T-74 on google.
Thanks.
Attachments
trans-open.jpg

Golden Jubilee
Golden Jubilee

Posts: 338

Joined: Wed May 29, 2013 6:50 am

Post Thu Jun 29, 2017 3:49 pm

Re: Transmission differences?

OK, I get it now . . . but all you would have had to say is a "constant mesh" trans doesn't have synchroes. The name really has nothing to do with the mesh of the gears as all transmissions' gears mesh. If the brochure had called them either syncromesh or non-syncromesh transmissions would have been more self-explanatory to me.

Golden Jubilee
Golden Jubilee

Posts: 2028

Joined: Fri Apr 08, 2016 4:52 pm

Post Thu Jun 29, 2017 10:24 pm

Re: Transmission differences?

https://www.edmunds.com/car-technology/ ... asics.html

This explains it pretty well.

There ARE synchro-equipped trans without first gear being synchronized. It was the first step after sliding-gear transmissions.

Golden Jubilee
Golden Jubilee

Posts: 338

Joined: Wed May 29, 2013 6:50 am

Post Fri Jun 30, 2017 12:42 am

Re: Transmission differences?

Thank you, I appreciate your reply.
It's not how they work that I don't understand, its just the terminology used to label their type of working I did not know. I don't recall non-synchronized transmissions as ever being labeled "constant mesh" transmissions. I just always called them non-synchronized transmissions.

Golden Jubilee
Golden Jubilee

Posts: 2028

Joined: Fri Apr 08, 2016 4:52 pm

Post Fri Jun 30, 2017 8:39 am

Re: Transmission differences?

Sounds like another vibration dampner/ harmonic balancer thing, to me.
Not THAT much going on inside a manual trans for there to be yet another label for them.

Golden Jubilee
Golden Jubilee

Posts: 338

Joined: Wed May 29, 2013 6:50 am

Post Tue Jul 04, 2017 5:06 pm

Re: Transmission differences?

Monsonmotors wrote:Sounds like another vibration dampner/ harmonic balancer thing, to me.. . .

Yes, that's exactly what it turned out to be . . .

Return to Loadstar

Who is online

Users browsing this forum: No registered users and 3 guests

cron
Powered by phpBB® Forum Software © phpBB Group
Designed by ST Software for PTF.