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1954 chevy 3100 OD trans??
#1025746 Fri May 02 2014 05:23 PM
Joined: Feb 2014
Posts: 34
D
Wrench Fetcher
Hi all,

I'm still fairly new to the AD truck world and wanted to know if there are any stock OD transmissions for a 1954 1st series truck? Or at least options to make it an overdive. I want to keep the truck stock with the 3-column shifter, but make it better for cruising highways.

Thanks


Psalm 32:8
Re: 1954 chevy 3100 OD trans??
DeanThe54Chevy #1025750 Fri May 02 2014 05:41 PM
Joined: Aug 2001
Posts: 1,131
G
Shop Shark
Half ton will be difficult because of the enclosed driveshaft. There was a "truckstell" add on overdrive that shows up every once in awhile but the most viable option to get more "top end" is going to be the aftermarket 3.55 gears (which will require an earlier carrier assembly to fit 54 housing) or going to an open driveshaft that will require new leaf springs, rear end assembly, driveshaft, and transmission.

Re: 1954 chevy 3100 OD trans??
DeanThe54Chevy #1025752 Fri May 02 2014 05:53 PM
Joined: Feb 2014
Posts: 34
D
Wrench Fetcher
Earlier carrier asembly?


Psalm 32:8
Re: 1954 chevy 3100 OD trans??
DeanThe54Chevy #1025779 Fri May 02 2014 08:34 PM
Joined: Aug 2001
Posts: 1,131
G
Shop Shark
Sent a PM. Has to do with the ring gear bolt pattern I think.

Re: 1954 chevy 3100 OD trans??
DeanThe54Chevy #1025785 Fri May 02 2014 09:48 PM
Joined: Feb 2001
Posts: 1,328
T
Shop Shark
Dean,
I believe a rear end from a 55 1st series will bolt in place of the one you have now. This will enable you to use an open driveshaft, which will enable you to use a sm319 o/d transmission. That would be a bolt in swap for what you have now, keeping you colunm shifter.


Tommy
59 apache 1/2t
261 short stepside
Re: 1954 chevy 3100 OD trans??
DeanThe54Chevy #1025791 Fri May 02 2014 10:10 PM
Joined: Aug 2001
Posts: 1,131
G
Shop Shark
Leaf springs will be different on 55 1st in that the centering pin is pretty much dead center between the front and rear eyes on the open driveshaft springs.

Re: 1954 chevy 3100 OD trans??
DeanThe54Chevy #1025800 Sat May 03 2014 12:00 AM
Joined: Sep 2001
Posts: 29,868
ace skiver
An earlier ring-gear carrier is needed for installing the 3.55 R&P conversion in a 1954 3100 rear end - that is what Greg is referring to.

The Truckstell car over-drive requires cutting and "splicing" the torque-tube.


Tim
1954Advance-Design.com [1954advance-design.com]
1954 3106 Carryall Suburban [stovebolt.com] - part of the family for 49 years
1954 3104 5-window pickup w/Hydra-Matic [1954advance-design.com] - part of the family for 15 years
Z-series (54/55) GMC 350 (2-ton) COE [1954advance-design.com] - 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. [chevy.oldcarmanualproject.com]
Re: 1954 chevy 3100 OD trans??
DeanThe54Chevy #1025830 Sat May 03 2014 01:51 AM
Joined: Dec 2000
Posts: 3,543
D
Gas Pumper
How many of us put OD's on an AD is, you get the standard Borg R-10 OD and 3 spd tranny with OPEN driveline. To do this, get a 55 1st series rear end, which is open, as previously stated, you will need to change your leaf springs so what the rear end center is centered on the leaf springs. This isn't hard, just have your leaf spring maker put the rear end perch pivot in the center. Once you have the leaf springs squared away, mount the 55 1st series rear end (its what I did, but wouldn't ANY TF era rear end work?) in place and just find a driveshaft that is the right length. So that's not easy either. So get a driveshaft company make you a correct length shaft. I gave my driveshaft experts a 1961 suburban open driveshaft and they cut it to fit.

The transmission bolts right up. There are many other issues, like the entire overdrive electricals, brackets, mountings, harness, etc.

I would encourage you to go for it. It is a great sense of accomplishment you feel when you learn of something cool, and then see it thru to fruition. Costly though. It IS the most elegant way to get to 75mph with relative ease.

Keep in mind though... 75 mph on an AD? What does that mean? Faster speeds means better braking. That single MC is just not suitable for DOUBLE what the old 45mph max truck could use. No, not even. You need better braking. Then, you cant put anyone you care about in the cab doing that speed without seat belts! Those two concerns right there pretty much go with the upgrade. Things to really consider before going down this road. In any case, you are in the right place!


Deve

1950 Chevy 3100 Deluxe Cab
1950 Chevy 3100 Standard Cab
In the Stovebolt Gallery
The Think Tank
More info and tips at Deve's Technet
Re: 1954 chevy 3100 OD trans??
DeanThe54Chevy #1025842 Sat May 03 2014 02:56 AM
Joined: Mar 2011
Posts: 1,476
J
Shop Shark
Originally Posted by DeanThe54Chevy
1954 1st series truck
Is this a trick question?
There is no such truck.
It is ether a 1954 1/2 ton truck. enclosed drive shaft.
Or a 1955 1st series truck. Open drive shaft.
Unless I missed something.

If it is a 1954 1/2 ton truck with the enclosed drive shaft.
You could try this trick:
Alignment Solution for Installing a Late Model Rear End in a 1947-1954 Pick Up.
On the original rear end, the spring centerbolt is offset to the front of the spring by 2"to 3". If you install a modern rear end (with an open driveshaft) and retain the original springs, the wheels will end up offset forward (inside) of the original wheel openings in the fenders. To correct this problem, remove the original springs and reverse them end to end (front to back) as they are the same on both ends. This will bring the spring centerbolt to the rear of the axle and place the new rear end in the center of the fender wheel openings. Jim Carter Tech Tip with picture

Tim Lederman & Greg_H are correct, in order to install a 3.55 ring gear in the 1954 1/2 ton 3rd member/carrier housing.
You have to use a 1940 to 1953 Chevy 1/2 ton differential carrier/spool case.
part number 3652336. Master parts Cat picture. Group # 5.510 MPC Part #3652336
So that the ring gear bolt pattern lines up with the bolt pattern on the differential carrier/spool case.
MPC also indicates the 55-57 1/2 ton O/D.

Re: 1954 chevy 3100 OD trans??
DeanThe54Chevy #1025846 Sat May 03 2014 03:03 AM
Joined: Dec 2000
Posts: 3,543
D
Gas Pumper
I have made an adapter plate that has a head on it and moves the rear end perch to center on your existing springs. Problem is, how many of us are sure the original springs are good enough to NOT be replaced?


Deve

1950 Chevy 3100 Deluxe Cab
1950 Chevy 3100 Standard Cab
In the Stovebolt Gallery
The Think Tank
More info and tips at Deve's Technet
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