The Stovebolt Site Forums The Shop Area Driveline Which Transmission

Hello,
I have a 1947 3100 half ton, I need to rebuild the transmission. I have 2 different transmissions for the truck.
Is there a way to know what transmission came in the truck originally?
1 is (590474)?
2 is (591195)?
Thanks

1 is (590474)? Check this number again, could it be 590874 (1937-39 COMM. 3-speed).

2 is (591195)? = 1941-47 COMM.

Mike B

It’s definitely a (590474) floor shift. They both are floor shift.

Chevy or GMC?

Ed

Isn't the 591195 a 3 speed for the '41-'47 1/2 ton Chevrolet trucks?

590474 I think Chevy, because it has a Chevy bow tie above the numbers. The other numbers I see are on the shift plate and they are (590511) I don’t know if that helps? I don’t know how to include a picture or I would.
I been doing some reading here, I found that the 1947 3100 came with a 3 speed, but a 4 speed was an option.
My question now is what’s a better transmission to go with 3 or 4 speed? It’s going on a 1955 235. I won’t be doing any towing, or burning rubber.
Rusty Heaps you are correct sir.

After one writes their story, click on 'use full editor' bottom right of the page, that will expose opportunity to add pictures.

Ed

47, instructions for posting photos is in the left margin of every page.

I'm going out on a limb here and saying that transmission is from the early 30's.



High (3rd) gear will be the same in both transmissions at 1:1, but the 41-47 truck trans will have 2nd and 3rd gears synchronized...the early trans may not be synchronized.

Mike B

So the 41-47 would be the 1 to rebuild.

I typed a long post the other day about your transmissions and I guess I never hit the post button because it's not here...

So, after further research I found that one of your transmissions is a 3-speed and the other is a 4-speed.

590474 = 1931-47 truck 4-speed. The date code looks like C 6 4 which would be March 6, 1934 (1934 is a guess on my part because I don't think they used the Bow Tie on the later transmissions built in the 1940's...someone please correct me if I'm wrong and they have a 1940's trans with the Bow Tie).

591195 = 1941-47 truck 3-speed.

Both would be correct in your 1947 truck, however the 3-speed might be synchronized while the 4-speed is not...does the 4-speed have the reverse lock out lever at the gear shift knob?

Both will be direct drive in High Gear. The 3-speed might be easier to drive, but not as good getting the load moving (no granny gear).

Mike B

It does have a small Rod and lever on the gear shift.
Are the 591195 3 speed hard to find? I can’t seem to find 1 in my area.