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Old 09-23-2007, 07:28 AM   #1
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Join Date: Jun 2006
Location: Milwaukee, WI
Posts: 79
Car: 1985 Berlinetta
Engine: 5.0 LG4
Transmission: 700R4
Axle/Gears: 3.08 Peg Leg

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700r4 Year ID

I've read all the articles that explain why '87-later 700r4's hold up better. I even have personal experience with my own junk breaking down.
But nothing I've read explains how to ID (externally) a later date tranny.
Casting codes? Type of pan bolts? Number of splines? Alien markings?
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Old 09-23-2007, 12:20 PM   #2
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Join Date: Mar 2007
Location: Tallahassee, Florida
Posts: 860
Car: '86 Trans Am and '03 S-10
Engine: 355ci and 4.3l
Transmission: 700R4 and NV3500
Axle/Gears: 7.625/3.42 Auburn and 8.5/3.08 Gov-

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Re: 700r4 Year ID

82-84 1/2 had 27 splines and anything after had 30 splines. Easiest way to tell if its a 87 or later is drop the pan and look for the auxillary valve body. But the best way is to get the ID off of it. If its a 82-84 the ID liiks similat to this ( 9 TA Y 0 M 12 N ) , if its a 85-86 the ID looks like this ( 6 MD 146 A ) , if its a 87-88 the ID looks like this ( 7 YK M Y 45335678-141 A ) and if its a 89-Later the ID looks like this ( 2 YD M 2 145 C ) . These series of #s all mean something as far as year, model, build date, etc. On the 85/86, 87/88 and 89/on the 1st digit it the model year. As in 85/86 the 6 is 86 and 5 is 85. On the 87/88 its the same. Also the 88 and later it is as well. Being a 1 is a 91, a 8 is an 88, and so on. Since the models stretched over a long period of time, you need to ID the year series 1st by the ID type. Notice how different each is. There is also a model code (MD) on the 85/86 sample and YK on the 87/88 sample, that will tell you more about it.
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Old 09-24-2007, 01:38 AM   #3
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Join Date: Sep 2007
Location: Leander,TX
Posts: 568
Car: 84 Z28 / 88 Trans Am / 87 base
Engine: L69 H.O. / 468 BBC / 2.8 v6
Transmission: 89 700R4 / TH375B / 700R4
Axle/Gears: 3.73 open / 3.23 posi / 3.42 open

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Re: 700r4 Year ID

well said!!!!
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Old 09-24-2007, 01:57 AM   #4
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Location: North Carolina(but you'll never take the DC out of me!!!)
Posts: 186
Car: '95 Z28 and '95 Tahoe
Engine: LT1 350/LO5 350
Transmission: 4L60E/4L60E
Axle/Gears: 2.73posi/3.42posi

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Re: 700r4 Year ID

Also the last 3 digits of the pump serial # on 88-up 700's should be 732.
That indicates that it's a 10 vane pump, used in the 88 and later trannies.
I read about that elsewhere in this forum but I can't remember where.
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Old 09-24-2007, 09:33 AM   #5
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Car: '86 Trans Am and '03 S-10
Engine: 355ci and 4.3l
Transmission: 700R4 and NV3500
Axle/Gears: 7.625/3.42 Auburn and 8.5/3.08 Gov-

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Re: 700r4 Year ID

Good info. Where is the Pump ID? I just pulled my tranny for a rebuild and would like to verify. The casting # on mine is cast big into the front. Its # 8654732. Top right. Also, is there a certain year that used the Double Priming Springs in the pump vs. the Single?
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Old 09-24-2007, 11:41 AM   #6
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Car: '95 Z28 and '95 Tahoe
Engine: LT1 350/LO5 350
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Axle/Gears: 2.73posi/3.42posi

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Re: 700r4 Year ID

Quote:
Originally Posted by Mikz86TA View Post
Good info. Where is the Pump ID? I just pulled my tranny for a rebuild and would like to verify. The casting # on mine is cast big into the front. Its # 8654732. Top right. Also, is there a certain year that used the Double Priming Springs in the pump vs. the Single?
Mikz86TA, you have a 10 vane pump. The 8654732 is the pump"s serial/casting #. I believe they started using the double priming springs
in 1988, but don't quote me on that.
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Old 09-24-2007, 10:40 PM   #7
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Car: 1985 Berlinetta
Engine: 5.0 LG4
Transmission: 700R4
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Re: 700r4 Year ID

Thanks for the replies; EXACTLY the type of information that I was looking for. I know where I can get what is advertised as an '87, and an '89, but how do I know for sure?

Thanks again.
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Old 09-25-2007, 02:09 AM   #8
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Location: Tallahassee, Florida
Posts: 860
Car: '86 Trans Am and '03 S-10
Engine: 355ci and 4.3l
Transmission: 700R4 and NV3500
Axle/Gears: 7.625/3.42 Auburn and 8.5/3.08 Gov-

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Re: 700r4 Year ID

I just read something about the 732 at the end being a late model pump. Also found mine to have the correct Aux VB port, the larger hole (.215") between the sealing rings which should make it a late 87-92 according to ATSG. I am guessing the double springs are present. I also found my Tranny ID is 91( I already knew) but that I have a VBody with the extra Converter Clutch Valve Port. IDK if the 91 had it (wouldnt think so) or weather the last tranny builder put it in there from a 87 model since I had no-ECM to control lockup. Im stumped on that...ANY INPUT? The spacer is a (EA) ID and OEM part # 8680144. That corresponds with 1991 and the model code from my tranny ID KWM. Im getting a new spacer plate tomorrow from Superior. This ones seen better days.
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Old 09-25-2007, 02:27 AM   #9
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Car: 1983 G20 Chevy
Engine: 305 TPI
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Re: 700r4 Year ID

The improved 700r4s also have an extra rib added externally, near the 2-4 servo. It started in 1987 and is was still being used on the last 4L60E I looked at. It starts near the bellhousing, goes up and right to the servo, the down toward the pan rail. It is a raised peak cast into the casting, looks like a hill, with its base starting at the pan rail. I will post pictures tomorrow to show the difference.
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Old 09-25-2007, 02:27 AM
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