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Re: adding overdrive transmission to a 1951 3100
Jon G #1409658 Wed May 12 2021 02:21 PM
Joined: Sep 2014
Posts: 3
M
Moderated
I found a driveshaft site online called Denny's Driveshaft. They sell a 16 spline yoke but can't build a driveshaft with that because they can't balance it with that 16 spline yoke.

I used their diagram B for measuring. https://www.dennysdriveshaft.com/app/webroot/img/File/how_to_measure_diagrams/b.html

#B6 came in at 56.625"
#B7 = .375"
#B10 = 3.129
#B11 = 1.062

If this sounds the same as a production shaft that would be good. Could use help finding a driveshaft. Let me know if you have some good suppliers.

Thanks again.

Re: adding overdrive transmission to a 1951 3100
Mr Masseyman #1409685 Wed May 12 2021 05:14 PM
Joined: Apr 2005
Posts: 1,865
R
'Bolter
Overdrive transmissions operate best when they are installed with the electrical components as the factory intended.
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 #1410350 Tue May 18 2021 06:50 PM
Joined: Jul 2019
Posts: 530
B
'Bolter
I find they operate just fine when simplified in some cases. Just use the governor and wire it through either a manual switch or one under pedal or micro on throttle linkage for auto pass gear. Use a bosch 5 pin standard 30a relay to throw the solenoid. I love mine. I have a manual pass gear on mine but with the v8 i never have to really use it. It auto downshifts from governor under like 25mph anyways.

Re: adding overdrive transmission to a 1951 3100
Mr Masseyman #1411023 Sun May 23 2021 01:13 PM
Joined: Dec 2018
Posts: 713
F
'Bolter
mm

Re: adding overdrive transmission to a 1951 3100
Mr Masseyman #1411026 Sun May 23 2021 01:31 PM
Joined: Dec 2018
Posts: 713
F
'Bolter
Mr Masseyman My first 53 3100 had a57 car rear axle,51 car 5 lug front hubs,used a tri-5 overdrive with a homemade welded in the middle driveshaft. Ran the rheels off of that one.Had my kickdown switch on the dash so you didn't have to open 2 four barrels to downshift ! I later learned that if the driveshaft is stralght it is balanced.Now you might fine tune it but in our 3100 trucks probably fine !! Have made several since that. We did balance some with a strobe light wheel balancer and hose clamps.

Re: adding overdrive transmission to a 1951 3100
Barnfind49 #1411028 Sun May 23 2021 01:45 PM
Joined: Dec 2018
Posts: 713
F
'Bolter
barnfind Did you know you can put the saginaw O.D.on the 4-speed ?? Done that in early 70's worked fine !!

Re: adding overdrive transmission to a 1951 3100
rfs56trk #1411029 Sun May 23 2021 01:52 PM
Joined: Dec 2018
Posts: 713
F
'Bolter
rfs56trk Do you know of a source for Delco relays ?? Have used ice cube relays for thatbut a real Delco would be the best ! Nice to have one in the glove box !!!

Re: adding overdrive transmission to a 1951 3100
Mr Masseyman #1411038 Sun May 23 2021 03:08 PM
Joined: Apr 2005
Posts: 1,865
R
'Bolter
fixite7,
There are some original Delco relays available on ebay. A 55/56 that uses the ring terminals for about $175 and a 57 up that uses spade terminals for about $120. I use the Bosch type relays in the wiring kits that I provide with rebuilt overdrive units. They work fine and most people don't want to spend that much for a relay. Similar story with KD switches, the Ford switches are reproduced and are about $30, NOS Delco switches are $200.
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
fixite7 #1414160 Thu Jun 17 2021 07:54 PM
Joined: Jul 2019
Posts: 530
B
'Bolter
Originally Posted by fixite7
barnfind Did you know you can put the saginaw O.D.on the 4-speed ?? Done that in early 70's worked fine !!

Yea I have seen it done. I contemplated doin one on a car I had with a 4 speed previously but knew it wouldn’t take much abuse.

Re: adding overdrive transmission to a 1951 3100
Mr Masseyman #1414265 Sat Jun 19 2021 11:06 AM
Joined: Nov 2004
Posts: 265
S
Custom Title
To the OP, check this out, it's a PDF download.BW OD [websearch.com] https://www.websearch.com/url?q=http://www.potomacbird.com/pctc/Public_Documents/bwwiring.pdf&sa=U&ved=2ahUKEwiJ_5e0xqPxAhWOt54KHbATDCcQFjABegQICxAB&usg=AOvVaw2bQMnK2vpR-hicGvyMfpdG

This is how I have my T85/R10 set up in my 49 3600. It works awesome!! I have full control of how and when it shifts, or I can let it just do it's thing

Last edited by Southtowns27; Sat Jun 19 2021 11:09 AM.

49 Chevy 3600
48 International KB-1 Service Truck
55 Willys CJ5 - Chevy 331 powered
26 Model T Roadster Rat Rod
70 Tucker Sno-Cat 442-A
96 Dodge 3500 Cummins dually flatbed x-cab 4x4
06 Jeep Wrangler LJ rock crawler
If you can't fix it with a hammer, it's an electrical problem
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