Technical Chevy six and gearbox, need gearbox ID and help

Hey

I finally got to pick up the engine I struck a deal on.

The guy left it out in the rain, under a tarp, standing on a pallet, a couple of month.
So now it's stuck, but at least it was free.

The trans is also a little stuck, I can wiggle the sliding gear, so I have soaked everything in Diesel, and played with it.

But I would love some ID and maybe some pictures/exploded views and some advice.






Car or truck? What year?
Could be syncro, could be crashbox?

 

40's early 50's probably.
Torque tube driveline
Compound 1st gear.




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This is a very silly question; what does "compound" 1st mean?

My Truck transmission is also compound first?
Is that like "to no use most of the time"?


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@tb33anda3rd.

Got nything to add?


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Trans is 3 speed. Last one for pickups was 1948.. Car 38-39 .... hard to see may have syncros. They are NOT brass like most folks know..

 

Casting number ends on 6, that means 1946? So most be small truck?

Thanks @jimmy six


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i think it is a 37-38[?] truck gear box. the trucks after that used pedals mounted to the frame.
i had both a 37 and 38 truck here and they had a different pedal mount, i think the one posted is a 37 could be earlier. 37 was a motor change year, any pics of the engine?

 

It's a '41 - early '47 3 speed truck trans. That's the one with rollers in the cluster, and is a little bit stronger than a car trans. Getting real hard to find.
Working on two '46 4 speed trucks right now, doing Bendix brakes & 3 speed changeovers and need 2 boxes just like the OP ....

 

granny low

 

Engine is a 1954 235 car engine.


[dIMG]https://www.jalopyjournal.com/mobile-gallery/f0733107a4d0d2e6119affd17221d551.jpg[/IMG]

 

46 truck sounds like it.

I don't know why folks call the granny gear 4 speed a "compound" transmission, because it's just a 4 speed. Low gear is a rather steep ratio, but it's not a compound ratio any more than 2nd 3rd gear are.

http://chevy.oldcarmanualproject.com/shop/1947truck/47ctsm0702.htm

 

Hmmmmm, thinking out loud here...
Would there be any benefit to using the 4 speed instead of a stock 20's Chevrolet transmission? Don't know about the ratios, but the syncro gears would be an upgrade?

 

Yes, there would, loads, but I just like the little cute gearbox.

I got a 3 speed Saginaw, I'm contemplating to use, but I need a shifter, and slip yoke.

And I'm being a little "thrifty", and Era Perfect, lol.


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That concurs with the listing in my Hollander's interchange manual.

 

VB- just thinking about TROG rules- keeping it '54 and earlier

 

What prevents this item from falling in to the box? And is there missing something inside it?

It looks odd to me

 

Id say the shifter registers into the center hole and somehow manages the gear changes with that plate. Never played with the early chevy trans, only early Ford.

 

Yes, but If I move it, it drops in to the box.

 

Do you have the complete shifter? Seems like that is part of the shifter assembly. Maybe its supposed to be attaced to the shifter top and not just loose like that.

 

The forks for shifting are attached to it, you can see the where they slide on the 2 shiney bars. The "ball" on the bottom of the shift handle goes in it and the plate holding on also keeps it from rocking or falling. Remember what your looking at is a 3 speed trans. The 48 truck was the last floor shift 3speed but may have gone to the large mounting bolt pattern like the 49-up.. That I don't remember.

If you've ever worked on a farm following a combine, bailer, etc. in a field you know what 1st gear was used for on the 4 speeds. You could creep right behind at a very low speed and I guarantee a normal 3 speed was no fun. We loved the "throttle" knob on the dash that let us run right above an idle. In the farrows of the field you could step out of the truck and it would follow right along.
My 53 Dodge had the same style trans and was great off-road in river beds.

2 more things: 302 was right about the rollers in the trans cluster, cars had bushings then, trucks had rollers. Last the word "granny" may have come from a dig on how grandmas drove.....slow...and these with these first gears, you drove very slow.

 

I know what granny first is, I just never got the difference between granny and compound first.

Over here it was common practice, to leave a tractor in low and raise the rpm slightly, and jump of and walk along side the tractor, and loading small hay-bales by hand.

So I know what it means to go granny slow. It was also common practice to let small kids and elderly women drive the tractor and not get of, because they was of no use at heavy lifting.


UPDATE, I got the thing in, and it now shifts.

Thanks

 

What kind of oil needs to be in this poppy?
What oil in the engine.

I still needs to fix the shifter. It has way to much play up and down.

Is there an open conversion for trans, or should I go with the Saginaw, despite it has no shifter.




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if you take the stick out of the tower you will probably find the little "axle" inside is worn. does the shifter rotate also?

 

85/90w gear lube.
Engine oil should be 20w or a multi grade 10/30 or 20/50.
The shift lever ass'y has a spring, pin & some washers to keep things in line. They wear to the point of sloppiness, but all of it can be welded up or replaced to tighten things. Looking the parts over, the worn places are obvious.

 

Yes, it does rotate, but it's also VERY loose.
, it feels like that the spring is pushed down, and doesn't hold it in the proper way. So I start checking that


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I will try taking it apart tonight.


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I tore it apart, and the rolepin is just a scratch and a faint memory.
I try taking it to work to rebuild tomorrow.

I might need som trans advice.

I plan to run the 1954 235 in the 1929 Chevy frame, and do a simple body.

But for the rear I plan to run a 86 Nissan D21 King Cab rearend, with 4.11 gears. And 5.00/5.50-17 tire on Artillery wheels

Will the 46 truck trans be a good match?
Or should I go for the other trans in my stockpile.



Any one gut a ratio comparison between these two boxes in question.

And recommendations between them.

 

Ratios should be the same unless the late trans is a close ratio, but that isn't likely. You'll need a '48 or newer bellhousing, though. The '37 - '47 is a slightly smaller trans pattern.
Wish you were closer - I'd swiftly trade you out of that '46 set-up and into everything you need !!

 

Late trans might be out of a truck.

And I got a Truck bellhousing too.

I'm pretty sure it fits in the other bellhousing.

Is the 47 truck trans that rare?
Maybe we can strike a deal someway.

If you can find me a yoke and a propshaft, and help to ship it.
I just need the enough of the Chevy to adapt it too the rear part of a Nissan Hardtail, Chevy slipyyoke/prop that is.

I will look into shipping if you are interested, send me a PM with details.