Author Topic: turbo 350 to 700r4  (Read 29264 times)

Offline Big Daddy

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turbo 350 to 700r4
« on: June 27, 2013, 06:59:22 PM »
been lurking around for years. loads of great info. anyway, does anyone know if 1984 700r4 is a direct bolt to a 79 k10 (350 turbo)? i understand  the drive shaft length and the crossmember may be different. What does the wiring plug on the tranny go to? Got the trans/transfer case out of 84 blazer. Thanks for the help

Offline jaredts

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Re: turbo 350 to 700r4
« Reply #1 on: June 27, 2013, 09:47:00 PM »
The plug is for the torque converter lockup.  You'll want to do a little research and hook that up.  If your th350 is a 9" tail you should be able to use the same driveshaft, but many of them are 6" tail and require a shorter driveshaft (you can have yours shortened).  You'll have to move the transmission crossmember back a couple inches or so and drill new holes in the frame as well.  A stock '84 700r4 is a pretty shady transmission though.  If it has been properly rebuilt with upgraded parts its fine.  If its stock the 700r4 was not perfected yet in '84 and had issues.

Offline 74 C-10 Shorty

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Re: turbo 350 to 700r4
« Reply #2 on: June 28, 2013, 07:38:31 AM »
87 and later has all the upgrades.

Offline Irish_Alley

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Re: turbo 350 to 700r4
« Reply #3 on: June 28, 2013, 11:06:30 PM »
but they arnt 700r4 are they? 4l60 then 4l60e
« Last Edit: June 29, 2013, 02:21:29 AM by Irish_Alley »
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Offline 74 C-10 Shorty

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Re: turbo 350 to 700r4
« Reply #4 on: June 29, 2013, 07:00:04 AM »
They are the same tranny, they changed the name towards 90 or something, never understood that.

Offline Irish_Alley

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Re: turbo 350 to 700r4
« Reply #5 on: June 29, 2013, 03:37:31 PM »
The 4l60 is the upgraded version of the 700r4. The 4l60e is the electronic controlled shift version of the 4l60
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Offline 74 C-10 Shorty

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Re: turbo 350 to 700r4
« Reply #6 on: June 29, 2013, 04:02:30 PM »
Yeah, but still the same tranny and still called a 700 in 87 if I remember right, and when you buy a rebuild kit you could get either one it's the same thing, in fact I've got one kit here that says 700R4-4l60 right on it.

Offline Irish_Alley

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Re: turbo 350 to 700r4
« Reply #7 on: June 29, 2013, 04:32:27 PM »
I don't know when they upgraded the 700 but yes its the same after the upgrade then 60e changed it again
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Offline 74 C-10 Shorty

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Re: turbo 350 to 700r4
« Reply #8 on: June 29, 2013, 06:48:57 PM »
The 700 was a POS when it came out, every year as the complaints came in the factory upgraded it until 87 that was the last upgrade that's why the preferred unit is 87 on up, but if you can pick up an early core for a good price it's not a big deal to upgrade it to the later unit, then there's even more upgrades to make it even stronger. Only difference in the "E" is the valve body, oh and some of the later ones had electric speedometer drive.

Offline Irish_Alley

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Re: turbo 350 to 700r4
« Reply #9 on: June 29, 2013, 11:13:41 PM »
82-86 was the 700r4 with 27 splines
http://www.summitracing.com/parts/tci-379000/applications/make/chevrolet?prefilter=1

82-86 also the 700r4 with 30 splines
http://www.summitracing.com/parts/tci-378905/applications

then 87-93 was the 4l60/700r4
http://www.summitracing.com/parts/bmm-70233/applications

then 94-2009 was the 4l60e this is the one your talking about with electric speed sensor it also has a round plug not the typical rectangle plug that you would find on the 4l60
http://www.summitracing.com/parts/tci-379110/applications
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Offline 74 C-10 Shorty

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Re: turbo 350 to 700r4
« Reply #10 on: June 30, 2013, 08:31:34 AM »
I don't know what year they came out with the electric speed sensor, but the one I built for my Nova is a 91 and it has the electric speed sensor.

Offline zieg85

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Re: turbo 350 to 700r4
« Reply #11 on: June 30, 2013, 11:04:51 AM »
I don't know what year they came out with the electric speed sensor, but the one I built for my Nova is a 91 and it has the electric speed sensor.

1988
Carl 
1985 C20 Scottsdale 7.4L 4 speed 3.21
1986 C10 under construction
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Offline jaredts

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Re: turbo 350 to 700r4
« Reply #12 on: June 30, 2013, 11:12:00 AM »
The electric speed sensor has nothing to do with being a 4L60e.  The "E" on the end means it is electronically shifted instead of hydraulic shifting.  As long as it is a 700r4 or 4l60 it is the same transmission usually just called the 700r4.  You can use a 4L60E in an older vehicle, but it requires a computer to be able to shift.  If you get a 700r4 with the electric speedo setup you can change it over to cable driven fairly easily if you have to.  There will be an electric plug where the driven gear sleeve normally is if it is an electric speedo setup.

Offline 74 C-10 Shorty

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Re: turbo 350 to 700r4
« Reply #13 on: June 30, 2013, 11:21:40 AM »
I don't know what year they came out with the electric speed sensor, but the one I built for my Nova is a 91 and it has the electric speed sensor.

1988
Thanks.. 8)

Offline 74 C-10 Shorty

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Re: turbo 350 to 700r4
« Reply #14 on: June 30, 2013, 11:31:06 AM »
The electric speed sensor has nothing to do with being a 4L60e.  The "E" on the end means it is electronically shifted instead of hydraulic shifting.  As long as it is a 700r4 or 4l60 it is the same transmission usually just called the 700r4.  You can use a 4L60E in an older vehicle, but it requires a computer to be able to shift.  If you get a 700r4 with the electric speedo setup you can change it over to cable driven fairly easily if you have to.  There will be an electric plug where the driven gear sleeve normally is if it is an electric speedo setup.
Exactly!.. Wonder if you can make it full manual just like the 4l80E, haven't heard anyone doing that yet??..

This is what the plug looks like..