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Old Dec 4, 2018 | 01:52 PM
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Transmission identification

Can anyone help identify this transmission? Guy claims it’s a toploader 4 speed overdrive. Cast numbers are: rf-r7dr-7ad40-aa

ill try to post pics
 
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Old Dec 4, 2018 | 03:56 PM
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Very possible. There were several versions of that transmission. Iron case, side shifted. Found in vans and pickups. Looks just like a performance 4 speed from the '60s because that's what it's based on. Aluminum case with a top shift out of the cover. Same basic design, found in pickups. Aluminum case with a tube heading back to a turret where the shifter is mounted. This is one that gives it the name "Single Rail Over Drive", or "SROD". Found in pickups and cars including Mustangs. Pictures and more here:

Toploader Imposters

And more with SROD pictures etc:

https://www.ford-trucks.com/forums/1...eral-info.html
 
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Old Dec 4, 2018 | 05:11 PM
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Originally Posted by 85e150six4mtod
Very possible. There were several versions of that transmission. Iron case, side shifted. Found in vans and pickups. Looks just like a performance 4 speed from the '60s because that's what it's based on. Aluminum case with a top shift out of the cover. Same basic design, found in pickups. Aluminum case with a tube heading back to a turret where the shifter is mounted. This is one that gives it the name "Single Rail Over Drive", or "SROD". Found in pickups and cars including Mustangs. Pictures and more here:

Toploader Imposters

And more with SROD pictures etc:

https://www.ford-trucks.com/forums/1...eral-info.html

I was trying to look at the picture of the tag and some is cutoff but I can make out clearly “G CD” I’m guessing RUG CD? Meaning that this is indeed a toploader overdrive?
 
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Old Dec 4, 2018 | 07:45 PM
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Is it iron? If so, look for the bulge in the case shown in the first link.

Aluminum? Has to be an SROD or variant, as the original performance top loader was iron. Likewise turret or top shift.

That said, what are your plans with it? They are not a very satisfying transmission. Big gap 2nd to 3rd is the worst feature.
 
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Old Dec 4, 2018 | 07:46 PM
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[QUOTE=85e150six4mtod;18343409]Is it iron? If so, look for the bulge in the case shown in the first link.

Aluminum? Has to be an SROD or variant, as the original performance top loader was iron. Likewise turret or top shift.[/QUOTE

its an iron one. I don’t have a lot of pics so I haven’t seen the one side
 
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