The 1947 - Present Chevrolet & GMC Truck Message Board Network - View Single Post - 47-59 4l80 v 700r4

mr48chev · 10-04-2023, 05:24 PM

4l 80 os a larger physically transmisison .

Size aside, it boils down to the simple fact of do you want to deal with a transmisson that you hook up a TV cable (simple but very critical adjustment) and a vacuum line or do you want to deal with newer electonic controlled unit that you will have to buy a controll unit for ? That is anywhere between 270 and 7 something depending on who you buy from and how deep your pockets are. And don't listen to the spit and whittle club idiots who say that you can convert it to manual shift.

The electronic transmissions are great if you buy the engine and trans as a unit and get all of the control pieces. The trans by it's self is going to be a challenge to put behind an older carbureted engine with a plug a pre computer HEI.

The one issue with this bunch is that all too often when someone asks a simple question guys get way off base and aren't thinking the actual question though and giving the best answer.

Yes there may need to be a slight lower firewall or transmission hump mod but those usually aren't a big challenge unless you just flat can't fabricate.

10-04-2023, 05:24 PM	#18
mr48chev Registered User Join Date: Jul 2007 Location: Toppenish, WA Posts: 15,338	Re: 4l80 v 700r4 4l 80 os a larger physically transmisison . Size aside, it boils down to the simple fact of do you want to deal with a transmisson that you hook up a TV cable (simple but very critical adjustment) and a vacuum line or do you want to deal with newer electonic controlled unit that you will have to buy a controll unit for ? That is anywhere between 270 and 7 something depending on who you buy from and how deep your pockets are. And don't listen to the spit and whittle club idiots who say that you can convert it to manual shift. The electronic transmissions are great if you buy the engine and trans as a unit and get all of the control pieces. The trans by it's self is going to be a challenge to put behind an older carbureted engine with a plug a pre computer HEI. The one issue with this bunch is that all too often when someone asks a simple question guys get way off base and aren't thinking the actual question though and giving the best answer. Yes there may need to be a slight lower firewall or transmission hump mod but those usually aren't a big challenge unless you just flat can't fabricate. Attached Images __________________ Founding member of the too many projects, too little time and money club. My ongoing truck projects: 48 Chev 3100 that will run a 292 Six. 71 GMC 2500 that is getting a Cad 500 transplant. 77 C 30 dualie, 454, 4 speed with a 10 foot flatbed and hoist. It does the heavy work and hauls the projects around.