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Old Jul 27, 2011 | 11:46 PM
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C6 casting numbers?

Im going to be putting a C6 in my '84 Bronco for the time being. Today I was changing the filter on it I found some numbers on the back of the tranny, by the tail shaft, They are:
3 356A1 76617 A

I also found on the valve body these other numbers:
D7AP-7A101-AA
LESTER-3

Mainly concerned about the numbers cast into the transmission housing by the tailshaft. Thanks for any imput. Hoping to find out what year C6 it is so I put the right ATF in it.
 
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Old Jul 28, 2011 | 11:13 PM
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D7AP is 1977 fwiw, which ain't much.

Look for a date code in this format: "7/2011".
 
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Old Jul 29, 2011 | 03:29 AM
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Alright so she's a '77 C6 then cool... today when I was giving the C6 a good cleaning before I put it in, I found a tag with another set of numbers on it:

PGD DL1 M23
E1TP CA 023674

I found these on a tag on a bolt that bolts on the servo on the passenger side of the tranny. Just wondering if there is a site I can go to to decypher these numbers? Thank you.
 
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Old Jul 29, 2011 | 05:38 AM
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1977 was the first year for Mercon/Dexron fluid in C6's;
76 & earlier used Type F (unless rebuilt with later clutches, bands etc).

The E1TP number is from 1981
 
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Old Jul 29, 2011 | 06:17 AM
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Thank you Ken. Would those numbers tell if it is a 3 speed or 4 speed? Im really hoping its a 4 speed with overdrive.
 
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Old Jul 29, 2011 | 12:34 PM
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A C6 is ONLY a 3 speed non-OD, non lockup trans.
 
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Old Aug 9, 2011 | 04:06 AM
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Im not to keen on AT lingo, non-lockup trans meens what again?
 
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Old Aug 9, 2011 | 04:33 AM
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It means the torque converter doesn't have a clutch inside it. It slips all the time.
 
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Old Aug 9, 2011 | 04:48 AM
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I thought sliping was bad as it wears things out quicker?
 
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Old Aug 9, 2011 | 10:00 AM
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It isn't sliping like clutches can do. A tc is a hydraulic cuppler so there no possitive/ mechanical lockup. There will always be some degree of slip in a tc.
 
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Old Aug 9, 2011 | 10:47 AM
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If you want to know more about torque converters and lockup clutches there is a good article at HowStuffWorks - Learn How Everything Works!
 
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Old Aug 10, 2011 | 02:59 AM
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Originally Posted by hayden01
Thank you Ken. Would those numbers tell if it is a 3 speed or 4 speed? Im really hoping its a 4 speed with overdrive.
As 85e150six4mtod said, the C6 is only a 3spd, but it's a much better suited transmission to a truck, or any hard working vehicle, than an AOD or AODE (which were 4spd's). The C6 is much heavier duty, simpler, & less expensive to eventually rebuild.

I've had each in my truck & I prefer the way that the C6 operates.

But the C6 is old-school (an auto-trans mechanic I know calls them "agricultural" ) & doesn't have the economy of either lockup or overdrive, if that's what you need.
 
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Old Aug 10, 2011 | 03:14 AM
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Those casting numbers are Ford engineering numbers and not when it was made! But Either way Mercon of Type F will be fine in the unit and Type F provides firmer shifting with less slippage!
 
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Old Aug 10, 2011 | 02:27 PM
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Originally Posted by ford390gashog
Those casting numbers are Ford engineering numbers and not when it was made! But Either way Mercon of Type F will be fine in the unit and Type F provides firmer shifting with less slippage!
That is true, but note that an "E1.." casting is going to be NO OLDER than 1981, or a "D7.." NO OLDER than 1977.
 
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