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Old 10-04-2009, 12:13 PM   #1
'55 1st series
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1955 Chevy 3100 1st series 5 window

I recently bought this 55 1st series and decided to fix her up. I am needing quite a few parts for it. Including new floor panels, hood, bed boards, just to name a few. It has a later year 235 with a 3 speed and I am hoping to put in a 4 speed w/ a floor shifter. Does anyone know if this would just bolt straight up to the 235? Thanks. I'll
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Old 10-04-2009, 12:14 PM   #2
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Re: 1955 Chevy 3100 1st series 5 window

That is the original 55 engine in the bed.
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Old 10-04-2009, 03:04 PM   #3
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Re: 1955 Chevy 3100 1st series 5 window

a four speed from the same era as the 3 speed or with same input shaft should bolt right up. If the 3 speed has an open drive line you might get lucky but I would plan on some drivelive work too. Floor shifters are available, you want to get one with a longer lever or plan on shifting hunched over, which gets old, I had a T-10 in my 57/235 pick up in the late 60's. The granny four speeds (SM465??) will bolt up to if that is what you want.
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Old 10-04-2009, 04:14 PM   #4
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Re: 1955 Chevy 3100 1st series 5 window

Alright, thanks. I found a 4 speed from a 53, it has been sitting outside for 6 months but ran before sitting. Any ideas on how to clean it out?
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Old 10-04-2009, 11:43 PM   #5
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Re: 1955 Chevy 3100 1st series 5 window

Should be sealed up pretty tight unless it was partially disassembled. I'd drain the fluid and if no water comes out and its not milky refill it. Steel wool and WD40 will clean up the input shaft if its rusty. While its out is a good time to look at the front and rear seals too.
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Old 10-04-2009, 11:48 PM   #6
'55 1st series
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Re: 1955 Chevy 3100 1st series 5 window

Well, it was taken off of a truck and laid on its side and just has set there.
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Old 10-05-2009, 05:15 PM   #7
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Re: 1955 Chevy 3100 1st series 5 window

Man I love those 54 & 55's!! Cant wait to see what you do to it.
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Old 10-06-2009, 11:42 PM   #8
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Re: 1955 Chevy 3100 1st series 5 window

Can't wait to get done
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Old 10-07-2009, 12:37 AM   #9
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Re: 1955 Chevy 3100 1st series 5 window

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Originally Posted by '55 1st series View Post
Well, it was taken off of a truck and laid on its side and just has set there.
Unless it had something wrong with it when pulled it should be ok, I'd drain and refill it and call it good unless the seals were obviously leaking before.
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Old 10-07-2009, 02:15 AM   #10
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Re: 1955 Chevy 3100 1st series 5 window

Alright will do probably Thursday. Let you know how it goes. Thank you fir all your help thus far!
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Old 10-07-2009, 03:35 PM   #11
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Re: 1955 Chevy 3100 1st series 5 window

It will not bolt up to the 4 speed. You will need to get a new bell housing if it orginally had the three speed. I did the same thing on my pickup, and was unpleasantly surprised when I tried to bolt them up. One of the many lessons I learned. Also you will have to modify the length on the clutch throw, no big deal but it took me an afternoon to figure it all out.

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Old 10-07-2009, 06:06 PM   #12
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Re: 1955 Chevy 3100 1st series 5 window

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It will not bolt up to the 4 speed. You will need to get a new bell housing if it orginally had the three speed. I did the same thing on my pickup, and was unpleasantly surprised when I tried to bolt them up. One of the many lessons I learned. Also you will have to modify the length on the clutch throw, no big deal but it took me an afternoon to figure it all out.
Maybe later is different I bolted a SM465 that was in a 56 to my 59 three speed bellhousing. Input shaft fit fine and did not have to change the clutch. Are the AD three speeds different than TF years?
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Old 10-08-2009, 11:07 AM   #13
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Re: 1955 Chevy 3100 1st series 5 window

Orrie knows a hell of a lot more about these things than do I. I am not sure what year the 4 speed came out of, only know it was from a one ton truck, and the bell housing was a lot beefier than the three speed bell housing. The shaft was not a problem, and the throwout lever was just enough different (maybe it was bent) that I had to modify the clutch throw distance to make it all work. I LOVE the 4 speed on the floor. It just sounds and feels right.
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Old 10-08-2009, 11:52 AM   #14
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Re: 1955 Chevy 3100 1st series 5 window

Sound like I was just lucky and someone before me had done all the adjusting on the 56 donar, and it was 28 years ago! Best to measure and compare the input shafts and bolt patterns between the 3speed and 4speed, then if it looks right jack it up and see if it fits ok. Clutch is an easy fix, just basic geometry problem to solve. I can't remember if I had to swap out the zeebar or not...
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Old 10-08-2009, 02:11 PM   #15
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Re: 1955 Chevy 3100 1st series 5 window

Didn't they change the bolt pattern on the bell housing in '55? I'm thinking that an earlier model xmision might not bolt up. Or was the change made for the TF later in '55?
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Old 11-06-2009, 04:47 PM   #16
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Re: 1955 Chevy 3100 1st series 5 window

Bells changed in '54 to accomodate the change to the cross member that also accepted the Hydramatic trans. Never heard of it being an issue to swap 3 and 4 speeds, though, and only see 1 bell for the two groups (pre and post 54). I want T5 and open rear end for my '54...someday.
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Old 05-19-2012, 10:47 AM   #17
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Re: 1955 Chevy 3100 1st series 5 window

Hate to resurrect a dead thread, but it's better than making a new one (I think?)
I've got a 57 with a three speed, wanting to go to a SM565.
It looks like I may or may not have throwout bearing travel adjustments to make.
Do the later-model SM465 transmissions use the same 4-bolt bellhousing pattern as the earlier 3 speeds?
Also - I'm told by previous owner that the existing trans is a 3 speed with a granny low that came out of an old school bus. It is shifted off the floor, looks to have a 10 spline output (I didn't count, though. D'oh) and is bolted to the 235 currently. I also have a 90 degree V8 / 3rd gen I-6 bell housing for this mystery trans. Any ideas what it is, so I can start figuring out compatibility?
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Old 05-19-2012, 07:20 PM   #18
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Re: 1955 Chevy 3100 1st series 5 window

Nevermind. Confirmed w/ previous owner it is a 4 speed w/ granny low.
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