Author Topic: 1986 C10 305 4 Barrel 700R4 tranny  (Read 272 times)

Offline mudman1

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1986 C10 305 4 Barrel 700R4 tranny
« on: July 27, 2018, 07:40:34 AM »
Is this thing "computer" controlled? If so, can the PSOM be eliminated and still have the 700R4 work properly? I am only familiar with the 350 and 450 tranny's.

Offline mudman1

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Re: 1986 C10 305 4 Barrel 700R4 tranny
« Reply #1 on: July 27, 2018, 07:50:01 AM »
What I should say, I want to set up the truck to be simpler. I might have some issues with the way it runs and just want to eliminate everything complicated (cruise control, unnecessary vacuum lines, PSOM & unwanted sensors). All I want is a simple carb, Hei distributer and have the tranny work properly without a computer.

Offline Irish_Alley

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Re: 1986 C10 305 4 Barrel 700R4 tranny
« Reply #2 on: July 27, 2018, 08:18:40 AM »
the only thing i know of is the converter lockup. this can be done with a toggle switch installed in the cab. but i know when i did it on my 4l80e im pretty much the only one i can trust to drive it as someone might not remember to unlock it when coming to a stop or locking it at the proper time.
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Offline mudman1

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Re: 1986 C10 305 4 Barrel 700R4 tranny
« Reply #3 on: July 27, 2018, 09:07:10 AM »
I did some research and common factor is the 700R4 can be ran without a computer and does not need the lockup  if driven in short durations. Lockup is only needed if driven on highway for long distance. So the next problem is the "computer" controlled carb and distributor. The HEI is simple enough, but the carb would be the actual problem to handle. So that is where I need help from the Almightly - All Powerful - All Knowing - Chevy Gods - where ever they be!!!!!!!!! Can I currently keep using that carb ot what do I have to do to make it work????????

Offline haroldwca

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Re: 1986 C10 305 4 Barrel 700R4 tranny
« Reply #4 on: August 28, 2018, 09:42:36 PM »
I'm assuming you still have the stock E4ME Q-jet carb.  You will want to acquire a Quadrajet that does not have the electrical connectors on the body of the carb, an M4ME.  An electric choke (the last E in M4ME) will actually be preferable, so that will be one connector you will retain.  It will be a bolt-in replacement as long as you retain the proper throttle linkage for the throttle valve (TV) cable to the transmission.  You will also want to keep the connector for the AC fast-idle solenoid that keeps the engine from bogging when switching on the AC at idle (assuming yours still works). 

Then you can begin to trace and eliminate all those pesky vacuum hoses (especially the hard plastic ones that are by now as brittle as uncooked spaghetti).  Don't go crazy and start ripping out parts left and right.  Make sure you know what you are removing.  All the emissions equipment can be removed and retain drivability, but know what you are doing before you do it. 

NOTE:  I did not say you can remove the emissions equipment and be legal in all 50 states.  You will have to determine for yourself what is permissible in your area.  Here in my area, vehicles the age of my '85 Silverado do not require an emissions inspection.  If your area does, you have fewer options.  It is up to you to know.  Good luck !

Offline Stewart G Griffin

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Re: 1986 C10 305 4 Barrel 700R4 tranny
« Reply #5 on: August 30, 2018, 02:13:19 PM »
Can you take a pic?

Not all truck carbs with electronics are CCC;  It may be dual accelerator pump.

Offline JohnnyPopper

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Re: 1986 C10 305 4 Barrel 700R4 tranny
« Reply #6 on: September 02, 2018, 07:55:07 PM »
https://www.summitracing.com/parts/prf-60109/overview/

this might help, or at least put you on the right track.