flathead transmission questions/advice
 

I picked up two toploader transmissions from my uncle this past weekend. I am looking for some advice and reassurances that i am correct in my thinking. I painter them two different colors so i dont mix up the parts.

The Blue one I believe is a 1932 based on the ser number, but the casing tells me it is a 1933-1935. pictures to follow.
48-7006-J
18-42659-unless i cant see another number???
It had the complete shifter slanted tower 40-7222 in it, but i think this is a 1936 shifter

The gold one i believe is a 1936
48-7006-H
18-2240299
Shift tower only, no stick, one detent, and i can only read 222
The gold one has slanted gears on the main shaft, so i think this is the better one to build. The large gear has some chips in it, so i need to replace it.

Do you agree:
I should rebuild the gold one?
the gold one is a 1936?
I can use the blue shifter and forks on the gold assembly?
What else do i replace if all looks good except this one gear?

Thanks

Re: flathead transmission questions/advice
 

Check with Mac Van Pelt with your questions. He's very helpful.

Re: flathead transmission questions/advice
 

So far i have found that the slanted tower 40-7222 with the shift rod is not compatible with the Gold, 48-7006-H, 18-2240299 transmission. The smaller of the two shift forks that go inside the transmission is a smaller diameter than the part it mates to in the transmission.

But i believe that the gears in the Gold, 48-7006-H, 18-2240299 transmission are the ones i want to use because they are newer?

Re: flathead transmission questions/advice
 

Do not pass go. Do not collect $200.00.


Buy this book,you wont be sorry.

Re: flathead transmission questions/advice
 

I have ordered the book.

The small "C" shift fork inside is:
1 3/4" wide for the blue
2" wide for the gold

Re: flathead transmission questions/advice
 

The gold one is a 36 trans. It has the helical 1st/reverse slider but with the wide teeth on the output shaft. Post 36 have a narrower teeth output shaft. The blue one is a 33-35 style trans. Both cases have a 48- part number so they were post 1934. However as you noted the shifter tops are different so you can't mix them up. And the shift levers are a different length. You will need a later shift lever for the gold trans. The synchros are the same.

Helical gears are quieter than straight cut gears.

Re: flathead transmission questions/advice
 

Thanks for the great help.

I will start looking for a shift lever for my gold transmission 48-7006-H,18-2240299. If anyone has one please contact me.

Re: flathead transmission questions/advice
 

Syncro hubs are the same but there two different ring (part with the fork groove)
widths....gotta be real careful. When you get VanPelts book it's all spelled out.
Charlie ny

Re: flathead transmission questions/advice
 

There are many minor difference between the two transmissions. Neither is considered to be the best of the pre war top shift transmissions. IMO For the best you have to look later to 39 or 40.

What do you plan to to with the transmission? What use?

Re: flathead transmission questions/advice
 

I am looking to build a simple hot rod. It will go behind my 1952 flathead in a model a. Very simple first build. No high performance stuff. I got these from my uncle and figured free is good. i know the 39/40 is best.

Re: flathead transmission questions/advice
 

The "gold" transmission is '36 pickup era and may have a 14T input which would make it a low geared transmission in 1st and 2nd. Count the teeth before you proceed just to know for sure what you have to work with. A '36 -'38 transmission will have a 16T input with all helical cut gears and a finer helical spline on the output shaft, a better transmission for your project in my opinion.
Good luck, Paul

Re: flathead transmission questions/advice
 

The later 16/28 input gear set that was used with the late type synchronizers from 1939 through 1950 or so will fit in the 36 box but the later 91A shift fork would be needed to make it work. The later 78 case is a bit stronger but the old ones will still work for light duty. The dual detent shift tower that started showing up in the 1938 time frame is also more desirable than the old single detent type but the older type will still work.

The older model 40 gearbox would take some more mods to use the late type gears in it due to the different shift folks. I've heard of folks making it all work though. It depends on which shift tower a person wants and how much work they want to put into it. I 3rd Mac's book. It tells a person what fits with what plus the general instructions.

Re: flathead transmission questions/advice
 

I counted the input gears on both the blue and the gold and they are both 16 tooth.

Its too bad that the blue one is older and does not have the helical cut gears. It looks so good it could be installed as is.

If i do not find the shift lever for the gold one (36) at a reasonable price, I will use the blue one(33-35).

Re: flathead transmission questions/advice
 

The old ones work OK but make a bit more noise than the helical types. If it's an easy overhaul, you could use it for a while then build up a stronger unit for the future.

Re: flathead transmission questions/advice
 

My build is a long way off. I am starting to collect parts now. We will see what i find as swap meets open up again. In the mean time I do have a good trasmission to use if needed.

Thanks for all the help guys.

Re: flathead transmission questions/advice
 

just use an empty case for your mock up, the future good trans can be put in later