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R9 or R11 Overdrive?
#1
Not too shy to talk
Not too shy to talk

James Green
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How do I tell which overdrive I have? I need to order a wiring harness. My car is a 48 Custom 8 Club Sedan (2 door). The VIN on the cowl reads 2255-9-2723. Does that mean R9? An old Packard guy I talked to thinks I have an R11. How do I tell for sure?

Posted on: 2008/11/26 21:17
48 Custom
48 Custom Club Sedan
56 Studebaker Golden Hawk
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Re: R9 or R11 Overdrive?
#2
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Eric Boyle
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Scrape off the grease on the o/d unit itself, the model designation is cast into the side of it.

Posted on: 2008/11/26 21:19
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Re: R9 or R11 Overdrive?
#3
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HH56
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Your car could have either, so another way without climbing under is to locate the OD relay on drivers side of firewall. The R9 has a black can near and similar in shape/size to voltage regulator with 6 wire terminals. The Rll has a smaller silver or natural can, with fuse on outside and 4 wire terminals.

Posted on: 2008/11/26 21:36
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Re: R9 or R11 Overdrive?
#4
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Jay Faubion
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If I am not mistaken, the "9" in your "2255-9-2723" indicates that your car is a 1949 model, not a 1948. And that being the case, you will most likely find that you have an R-11.

I have a similar situation with my 2262-9, which has an R-11.

Jay

Posted on: 2008/11/27 10:00
Jay Faubion
Ask me, I've got one!
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Re: R9 or R11 Overdrive?
#5
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Owen_Dyneto
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Yes, Jay is right as always, the -9- indicates either a 1949 (but 22nd series) car, or less likely a 1948 left-over which was retagged by the factory to make it a 1949. The later is probably not the case due to the very low sequence #.

As already pointed out, there are differences between R-9 and R-11 in quite a few respects (both being equally functional) but the easiest way to tell is by the relay. Large black with 6 leads for R-9, smaller cadmium-covered relay with intergral fuse holder for the R-11.

Posted on: 2008/11/27 10:11
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Re: R9 or R11 Overdrive?
#6
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David Baird
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Visually, there are several clues to determine which overdrive is in a given car. The R-9 has the solenoid located on the right side of the transmission and used 4 wires for control. The R-11 solenoid is on the left side and uses only 2 wires. The overdrive cases also have either the R-9 or R-11 designation cast on the top surface. From under the hood, if the control cable goes down the driver's side of the engine the car is equipped with the R-11. Conversely, if it goes down the passenger side, the car is equipped with an R-9. Also the relay, mounted on the fire wall, is twice as large for the R-9 as the one for the R-11 unit.

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Posted on: 2008/11/28 0:09
North Hills Packards
2 - 1949 Super Convertibles
1949 Club Sedan
1947 Custom Sedan
Completed a book on the 22nd & 23rd series cars
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Re: R9 or R11 Overdrive?
#7
Not too shy to talk
Not too shy to talk

James Green
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Wow! This group is awesome. You have collectively answered my question very well. Under many years of grease I found an upside down R-11 on the case casting. The picture of relay adds further confirmation.

Posted on: 2008/11/28 16:56
48 Custom
48 Custom Club Sedan
56 Studebaker Golden Hawk
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Re: R9 or R11 Overdrive?
#8
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Jay Faubion
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I am probably going to be a newbie at this business the rest of my life, but I did gain a little experience with the R-11 overdrive over the summer.

I did up a little webpage that explains (in newbie-speak) how the R-11 works, and how I repaired mine. I got lots of help and advice along the way. Click Here to see what I'm talking about. I hope it will be helpful to you.

Posted on: 2008/11/29 12:32
Jay Faubion
Ask me, I've got one!
Visit JaysPackard.com
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