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transmission swap #1311093 Sat May 18 2019 10:36 PM
Joined: Dec 2006
Posts: 18
F
frogfarmer Offline OP
New Guy
Will a 4 speed floor shift transmission from a 1948 1/2 ton Advance Design pickup swap into a 1948 Chev Sedan Delivery? The 3 speed column shift transmission with vacuum assist in the delivery is problem ridden. If the swap is simple that's the way we'll go.

Re: transmission swap [Re: frogfarmer] #1311095 Sat May 18 2019 10:53 PM
Joined: Feb 2004
Posts: 19,015
H
Hotrod Lincoln Online
Boltergeist
If the Sedan Delivery uses the same bellhousing as the pickup, the swap will probably be pretty simple. The car transmission had a very different bellhousing bolt pattern than the truck 3 or 4 speed. I'm not sure which driveline components the Sedan Delivery used. There might also be a difference in the length of the torque tube and a different universal joint which would need to be adapted to the 4 speed transmission. The swap might not impossible, but it's probably difficult.
Jerry


The murder victim was drowned in a bathtub full of Rice Krispies and milk.
The coroner blamed the crime on a cereal killer!

Cringe and wail in fear, Eloi- - - - -we Morlocks are on the hunt!
Re: transmission swap [Re: frogfarmer] #1311097 Sat May 18 2019 11:10 PM
Joined: Sep 2001
Posts: 28,460
tclederman Offline
Boltergeist
The Sedan Delivery does not use the same clutch/flywheel housing as used in trucks.

The Sedan Delivery uses the car driveline components.


Tim
1954Advance-Design.com
1954 3106 Carryall Suburban - part of the family for 48 years
1954 3104 5-window pickup w/Hydra-Matic - part of the family for 14 years
Z-series (54/55) GMC 350 (2-ton) COE - now part of Dave's family
- If you have to stomp on your foot-pedal starter, either you, or your starter, or your engine, has a problem.
- The 216 and early 235 engine are not "splash oilers" - this is a splash oiler.
Re: transmission swap [Re: frogfarmer] #1311100 Sat May 18 2019 11:31 PM
Joined: Apr 2005
Posts: 7,616
Justhorsenround Offline
Grease Monkey, Moderator General Truck Talk & Greasy Spoon
The Sedan Delivery while listed in some of the Truck Sales Material is in reality a car. Very little is interchangeable with truck parts.


Martin
'62 Chevy C-10 Stepside Shortbed (Restomod in progress)
'47 Chevy 3100 5 Window (long term project)


"I fought the law and the law won" now I are a retired one!
Support those brave men/women who stand the "Thin Blue Line" and lock up those on the wrong side of that line.

Re: transmission swap [Re: frogfarmer] #1311104 Sun May 19 2019 12:01 AM
Joined: Sep 2001
Posts: 28,460
tclederman Offline
Boltergeist
The 1941-1948 car and Sedan Delivery used the same engine with 9" clutch assembly.
The truck clutch assembly was larger.

My guess is the 1941-1953 216 was the same engine (block/head assembly), with some/many peripherals (bolt-ons) being different.

The car/truck 235 head/block assembly were the same through 1953 (with many peripherals (bolt-ons) being different).
Except for the 1950 and later 235 car engines on Powerglide-equipped cars (hydraulic lifters).


Tim
1954Advance-Design.com
1954 3106 Carryall Suburban - part of the family for 48 years
1954 3104 5-window pickup w/Hydra-Matic - part of the family for 14 years
Z-series (54/55) GMC 350 (2-ton) COE - now part of Dave's family
- If you have to stomp on your foot-pedal starter, either you, or your starter, or your engine, has a problem.
- The 216 and early 235 engine are not "splash oilers" - this is a splash oiler.
Re: transmission swap [Re: frogfarmer] #1311107 Sun May 19 2019 12:33 AM
Joined: Jan 2008
Posts: 4,657
C
crenwelge Offline
Shop Shark
Passenger cars from the floor shift days until 1954 used the same bolt pattern. I'm not sure just how the vacuum shift worked, but 60 years ago everyone that had it got rid of it and I'm sure it hasn't gotten any better. In fact a lot of kits were offered to remove the vacuum shift from 1939 through 1948. NOS vacuum shift units appear on eBay quite regularly and right now I see one of the vacuum shift delete kits on eBay. The problem is in the linkage, not the transmission itself.

Re: transmission swap [Re: frogfarmer] #1311116 Sun May 19 2019 02:04 AM
Joined: Feb 2004
Posts: 19,015
H
Hotrod Lincoln Online
Boltergeist
The rubber parts in the vacuum shift cylinder would get sticky and refuse to move smoothly. The fix was simple- - - -run a 6 ounce can of Casite Tune-Up through the shift cylinder by letting the engine vacuum at the cylinder vent suck the liquid through it. Then the same solvent would serve double duty by cleaning carbon off the valve guides. The same procedure also worked well on vacuum windshield wiper motors, BTW!
Jerry


The murder victim was drowned in a bathtub full of Rice Krispies and milk.
The coroner blamed the crime on a cereal killer!

Cringe and wail in fear, Eloi- - - - -we Morlocks are on the hunt!
Re: transmission swap [Re: frogfarmer] #1311134 Sun May 19 2019 10:12 AM
Joined: Feb 2011
Posts: 869
R
rickmg Offline
Shop Shark
If the 4 speed isn't a sychronized transmission I'd stay with the 3 speed that is sychronized. As stated above do away with the vacuum shift. I'd try Jerry's remedy first tho.

Rick

Re: transmission swap [Re: frogfarmer] #1311155 Sun May 19 2019 03:12 PM
Joined: Jan 2001
Posts: 4,831
P
Pre '68 Dave Offline
Shop Shark
Here is a list of transmission bolt patterns from my blog.

Attached Files
Capture.JPG (33.93 KB, 69 downloads)

See the USA in your vintage Chevrolet!
My Blog
Re: transmission swap [Re: frogfarmer] #1311195 Sun May 19 2019 09:43 PM
Joined: Dec 2006
Posts: 18
F
frogfarmer Offline OP
New Guy
Thank you for the replies and suggestions.
This is a project that I am helping my son with. He would prefer a floor shift. We'll get out the tape measure and take some measurements. The pickup transmission doesn't have the little lever by the knob for shifting into reverse so I'm assuming it isn't a crash box.
If it looks like too much of a project, we"ll try solvent.
Is there another product that is similar to Casite Tune-up?
If neither of the above work out, we'll probably try a vacuum assist delete kit.

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