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08-24-2021, 03:47 PM
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#1 |
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Registered User
Join Date: Aug 2010
Location: Southern CA
Posts: 1,605
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700R4 decoding help?
Does anyone know where to find the codes for a 700R4? I have two 700R4's and am trying to figure out the differences between them and decide which one I should use. The pad on the right rear corner reads 4YP061C on one, and 5VG353B on the other.
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08-24-2021, 03:58 PM
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#2 |
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Registered User
Join Date: Jul 2015
Location: Sedalia Mo.
Posts: 1,130
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Re: 700R4 decoding help?
Those would be '84 and '85 units. See here...
https://mechanicbase.com/transmissio...-transmission/ I just went through sourcing one of these transmissions and have been told by a few tranny folks that the one you want will be newer than an 87 unit...something to do with upgrades that GM made as the years progressed that made them better. I guess the new models would be better, but the 85 model that was in my K20 seemed to do fine until I broke a corner of the tail housing when separating the transfer case. My advice would be to find a newer one of you are building something above stock horsepower or to use beyond daily driver status.
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He who is without oil shall throw the first rod. Compressions 8.7:1 1972 C10 1976 C10 (parts truck) 1985 K20 |
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08-24-2021, 04:04 PM
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#3 |
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Registered User
Join Date: Jul 2015
Location: Sedalia Mo.
Posts: 1,130
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Re: 700R4 decoding help?
__________________
He who is without oil shall throw the first rod. Compressions 8.7:1 1972 C10 1976 C10 (parts truck) 1985 K20 |
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08-24-2021, 04:30 PM
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#4 | |
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Registered User
Join Date: Jun 2014
Location: Orlando Florida
Posts: 1,598
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Re: 700R4 decoding help?
If it's 2wd the newer ones will have a VSS and metal gear instead of the plastic gear and mechanical drive for the speedometer.
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08-27-2021, 08:42 PM
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#5 |
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Registered User
Join Date: Aug 2010
Location: Southern CA
Posts: 1,605
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Re: 700R4 decoding help?
Thanks Sick, I see the year coding but there's no breakdown for the model code (which I think is the two letters after the year). But maybe I'm asking the wrong question—are both of my transmissions identical? I was assuming some difference in performance (gearing, strength) depending on the application (a pickup vs a Camaro for example), but maybe I'm wrong... Are they all built and geared the same way? If so I'll just pick the better condition one. This will be going behind a mildly built small block, not a pavement pounder.
Last edited by 1960chevypanel; 08-27-2021 at 09:55 PM. |
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08-27-2021, 09:02 PM
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#6 | |
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Registered User
Join Date: Jun 2014
Location: Orlando Florida
Posts: 1,598
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Re: 700R4 decoding help?
The older ones have weaker internal parts.
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08-30-2021, 08:36 AM
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#7 |
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Registered User
Join Date: Jul 2015
Location: Sedalia Mo.
Posts: 1,130
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Re: 700R4 decoding help?
According to the PDF I linked...
The 4YP is from a 1984 5.0L "F"-CAR and the 5VG is from a 1985 4.3L "C"-TRUCK/"G"-VANS (Calif) My guess is that these transmissions are basically equivalent, key word "guess".
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He who is without oil shall throw the first rod. Compressions 8.7:1 1972 C10 1976 C10 (parts truck) 1985 K20 |
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08-30-2021, 07:09 PM
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#8 |
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Registered User
Join Date: Dec 2013
Location: Columbus, Oh
Posts: 366
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Re: 700R4 decoding help?
Use the 85, It is the 2nd version of the 700R4/4L60 transmission with a 30 Spline input shaft. The 82-84 had a 27 spline input shaft. Internal gear Ratios are the same in all transmissions.
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09-01-2021, 01:18 PM
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#9 | |
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Join Date: Aug 2010
Location: Southern CA
Posts: 1,605
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Re: 700R4 decoding help?
Quote:
Sorry man, I must have missed that when I checked the .pdf. Thanks for the help! |
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09-01-2021, 01:19 PM
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#10 | |
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Registered User
Join Date: Aug 2010
Location: Southern CA
Posts: 1,605
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Re: 700R4 decoding help?
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