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Re: adding overdrive transmission to a 1951 3100
Mr Masseyman #1347151 Wed Feb 19 2020 02:19 PM
Joined: Apr 2005
Posts: 9,909
Grease Monkey, Moderator General Truck Talk & Greasy Spoon
Stovebolt is not one of his/her priorities.🛠


Martin
'62 Chevy C-10 Stepside Shortbed (Restomod in progress)
'47 Chevy 3100 5 Window (long term project)
‘65 Chevy Biscayne 4dr 230 I-6 one owner (I’m #2) “Emily”
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Re: adding overdrive transmission to a 1951 3100
Justhorsenround #1347235 Thu Feb 20 2020 02:56 AM
Joined: Mar 2010
Posts: 9,708
5
'Bolter
Originally Posted by Justhorsenround
Stovebolt is not one of his/her priorities.🛠

Maybe not, but he sure did give a bunch of us, with nothing better to do, the opportunity to opine. smile
Maybe he'll get back to us in another six years.

Re: adding overdrive transmission to a 1951 3100
Mr Masseyman #1347691 Mon Feb 24 2020 02:23 AM
Joined: Nov 2000
Posts: 2,021
F
'Bolter
The OP wrote “I have purchased an overdrive transmission“, though he didn’t give any details about it. His knowledge level of his truck including the torque tube may be... limited. For a long time I didn’t really understand them either. Hopefully he’s reading and learning from here and other sources.


Professional Novice
Re: adding overdrive transmission to a 1951 3100
tclederman #1409309 Mon May 10 2021 01:33 PM
Joined: Sep 2014
Posts: 3
M
Moderated
Hi guys. Sorry for the delay getting back and thanks for all the informative comments.

As with many this past year was full of challenges that pushed the truck down the list of things to take care of. Well we're back on steady ground and looking to get things running with my 3100.

To answer some of the questions I have replaced the torque tube driveline with an open rear axle from a 1955 3100. I adapted it to the original leaf springs to get the correct ride height and wheelbase. I replaced the original 3 speed transmission with an gm overdrive transmission from that period. Looks similar to the original trans but has a solenoid and cable that run to it to control from the driver seat I don't plan on installing the full automated system but use the cable to engage / disengage the overdrive.

The last part of the set up is getting a drive shaft to tie it all together. The tail shaft on the trans is 16 spline. Need to find a source for the new driveshaft. Any thoughts?
I hear the discussion on the front chassis and brakes. The original have worked fine previously, but I think an update from the single master cylinder would be a good modification along with the roller bearings instead of the ball bearings.

Look forward to the next round of advice. Thanks in advance.

Re: adding overdrive transmission to a 1951 3100
Mr Masseyman #1409355 Mon May 10 2021 05:30 PM
Joined: Mar 2014
Posts: 2,382
J
'Bolter
There should be any number of driveshaft makers up your way. I'd try to look closer to home to minimize shipping costs. If you need help on measuring for a new one, please let us know. Not difficult at all.


Jon

1952 1/2 ton with 1959 235
T5 with 3.07 rear end
Re: adding overdrive transmission to a 1951 3100
Jon G #1409556 Tue May 11 2021 07:40 PM
Joined: Dec 2018
Posts: 713
F
'Bolter
Jon G Your right better not push it on speed in AD trucks. My 51 6400 is happy at about 48 MPH !!

Re: adding overdrive transmission to a 1951 3100
Mr Masseyman #1409559 Tue May 11 2021 07:49 PM
Joined: Dec 2018
Posts: 713
F
'Bolter
Mr Masseyman You'll learn this,with the overdrive in the truck can roll away. Best to park in reverse which will take it out of overdrive !! I also put my kickdown on the dash ,so I didn't have to throw the throttle wide-open to downshift.

Re: adding overdrive transmission to a 1951 3100
Mr Masseyman #1409580 Tue May 11 2021 09:26 PM
Joined: Apr 2005
Posts: 1,865
R
'Bolter
55-57 Passenger cars and 3100 TF trucks with a 3 speed or OD trans use the same driveshaft. I believe the earlier models like your truck have the same wheelbase. If so, find one for those years and you don't have to make one up.

Fred


1956 3100 Pickup/Red/350/3sp OD/PS/Disc Brakes
1957 Bel Air Sport Coupe/Red/355/TH350/PS/Disc Brakes
2017 Silverado LT Single Cab SB/Black/5.3/6 Speed Trans
1947 Willys CJ2A w/F-Head engine
Re: adding overdrive transmission to a 1951 3100
Mr Masseyman #1409584 Tue May 11 2021 11:14 PM
Joined: Dec 2020
Posts: 88
G
'Bolter
With this OD and no power to the little motor mounted to the side of the
transmission, can the OD be operated manual at 45mph +with the pull cable?

Attached Files
warner.jpg (134.87 KB, 162 downloads)

1958 3100 Apache 327 engine
Re: adding overdrive transmission to a 1951 3100
Mr Masseyman #1409598 Wed May 12 2021 12:44 AM
Joined: Feb 2004
Posts: 22,595
H
'Bolter
No- - - -the cable can only lock the transmission OUT of OD, like for going down Wolf Creek Pass!

https://www.youtube.com/watch?v=KHb_0Lhegig

Jerry


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