LS matted to a 700R4 - The 1947 - Present Chevrolet & GMC Truck Message Board Network

BabyBlue · 01-15-2020, 02:44 PM

Anyone have an LS matted to a 700R4? I currently have a newer ATK 350 (<2000 miles) crate in my truck with a built 700R4. I have my doubts about the ATK motor, it has been having some issues lately and I am convinced that there is something up with it.

I'll be doing a compression test, a coolant pressure test and if both of those come back good then I'll replace the manifold gaskets and attack the leaking front oil pan seal... but I am not confident in the results... so I was curious for any tips or pointers with matting up a 5.3 or 6.0 to a 700R4....especially if it retains the full fuel injection system.

**mongocanfly** · 01-15-2020, 03:34 PM

Itll bolt right up with the proper spacer...the kickdown is a issue I've seen discussed
A better choice would be just to go with a 4l60... and sell what you got...then you would have a matched setup
But theres a lot of wrightups on ls1tech about the 700r4

Ziegelsteinfaust · 01-15-2020, 07:05 PM

If your using a LS computer you need the 4L65E to retain computer control.

The 4L60 was just a electric speedo added on a T700R4 vs a cable driven.

The kick down if you use a T700R4 or 4L60 will need to be dealt with. Even if you think you will do a full Manuel valve body.

BabyBlue · 01-15-2020, 09:42 PM

Interesting...I’ll take a look at ls1tech and see how much of a hassle it is. I may opt for a bbc for an easy swap. Thanks for the info.

prodjay10 · 01-16-2020, 02:33 AM

4L60e is also computer controlled.

That's what I have with my 5.3. I was cursing during the swap because I had a difficult time with it. Now that it's done I am happy I went through with it.

What's going on with your 350? Have you checked the gas tank for rust? If it's been sitting for a while that rust and debris will cause lots o' problems.

I'm a diy kinda person, but when I hit a wall I'll hire someone to get me passed that hurdle. It's better than getting frustrated and scrapping a project. Or usually cheaper than throwing parts at it. Just a thought.

LS short box · 01-17-2020, 06:28 PM

If you going LS from 2006 and older? the LS computer will control the engine and the 4L60E. After that they have one ecm for the engine and one ecm for the trans. No real big deal tuning wise.
The 4L60E is so tuneable? Much better than the 700R via a laptop.
I know you have the 700R but a 4L60E would be a much better match to the LS.

**Captainfab** · 01-17-2020, 10:30 PM

The issue I see, is how to connect the 700R4's TV cable to the LS engine's throttle and getting the geometry correct. As already mentioned, a 4L60E or a 4L80E would be a much better choicer and much simpler to install and tune.

01-15-2020, 02:44 PM	#1
BabyBlue The Peacemaker Join Date: Feb 2005 Location: Kannapolis, NC Posts: 783	LS matted to a 700R4 Anyone have an LS matted to a 700R4? I currently have a newer ATK 350 (<2000 miles) crate in my truck with a built 700R4. I have my doubts about the ATK motor, it has been having some issues lately and I am convinced that there is something up with it. I'll be doing a compression test, a coolant pressure test and if both of those come back good then I'll replace the manifold gaskets and attack the leaking front oil pan seal... but I am not confident in the results... so I was curious for any tips or pointers with matting up a 5.3 or 6.0 to a 700R4....especially if it retains the full fuel injection system. __________________ 1978 Chevy 2wd Stepside aka "Audrey" Cordova brown with mandarin guts 79k original miles & being restored 1979 Chevy 2wd Short Wide aka "Emma-Jayne" Cordova brown with mandarin guts 2019 Chevy Tahoe LT Previous rides: -2002 Firehawk T/A, 2006 Trailblazer SS AWD, 2014 GMC Sierra RCSB, 1971 2wd Blazer, 1996 SNB, 1997 2dr 2wd Yukon, 2001 Silverado RCSB, 2011 Silverado Z71 4x4, 1982 2wd Blazer, 1997 2dr Tahoe, 1970 Chevelle SS, 1972 2wd Blazer, 1986 Silverado Stepside, 1995 S-10, 1985 Silverado SWB.

01-15-2020, 03:34 PM	#2
mongocanfly Post Whore Join Date: May 2015 Location: Alabama Posts: 14,581	Re: LS matted to a 700R4 Itll bolt right up with the proper spacer...the kickdown is a issue I've seen discussed A better choice would be just to go with a 4l60... and sell what you got...then you would have a matched setup But theres a lot of wrightups on ls1tech about the 700r4 __________________ Mongo...aka Greg RIP Dad RIP Jesse 1981 C30 LQ9 NV4500..http://67-72chevytrucks.com/vboard/s...d.php?t=753598 Mongos AD- LS3 TR6060...http://67-72chevytrucks.com/vboard/s...34#post8522334 Columbus..the 1957 IH 4x4...http://67-72chevytrucks.com/vboard/s...63#post8082563 2023 Chevy Z71..daily driver Last edited by mongocanfly; 01-15-2020 at 03:41 PM.

01-15-2020, 07:05 PM	#3
Ziegelsteinfaust Registered User Join Date: Dec 2012 Location: Temple City Posts: 3,558	Re: LS matted to a 700R4 If your using a LS computer you need the 4L65E to retain computer control. The 4L60 was just a electric speedo added on a T700R4 vs a cable driven. The kick down if you use a T700R4 or 4L60 will need to be dealt with. Even if you think you will do a full Manuel valve body.

01-15-2020, 09:42 PM	#4
BabyBlue The Peacemaker Join Date: Feb 2005 Location: Kannapolis, NC Posts: 783	Re: LS matted to a 700R4 Interesting...I’ll take a look at ls1tech and see how much of a hassle it is. I may opt for a bbc for an easy swap. Thanks for the info. __________________ 1978 Chevy 2wd Stepside aka "Audrey" Cordova brown with mandarin guts 79k original miles & being restored 1979 Chevy 2wd Short Wide aka "Emma-Jayne" Cordova brown with mandarin guts 2019 Chevy Tahoe LT Previous rides: -2002 Firehawk T/A, 2006 Trailblazer SS AWD, 2014 GMC Sierra RCSB, 1971 2wd Blazer, 1996 SNB, 1997 2dr 2wd Yukon, 2001 Silverado RCSB, 2011 Silverado Z71 4x4, 1982 2wd Blazer, 1997 2dr Tahoe, 1970 Chevelle SS, 1972 2wd Blazer, 1986 Silverado Stepside, 1995 S-10, 1985 Silverado SWB.

01-16-2020, 02:33 AM	#5
prodjay10 Registered User Join Date: Jun 2016 Location: Phoenix AZ Posts: 429	Re: LS matted to a 700R4 4L60e is also computer controlled. That's what I have with my 5.3. I was cursing during the swap because I had a difficult time with it. Now that it's done I am happy I went through with it. What's going on with your 350? Have you checked the gas tank for rust? If it's been sitting for a while that rust and debris will cause lots o' problems. I'm a diy kinda person, but when I hit a wall I'll hire someone to get me passed that hurdle. It's better than getting frustrated and scrapping a project. Or usually cheaper than throwing parts at it. Just a thought.

01-17-2020, 06:28 PM	#6
LS short box Registered User Join Date: Jun 2015 Location: Carlos MN Posts: 1,920	Re: LS matted to a 700R4 If you going LS from 2006 and older? the LS computer will control the engine and the 4L60E. After that they have one ecm for the engine and one ecm for the trans. No real big deal tuning wise. The 4L60E is so tuneable? Much better than the 700R via a laptop. I know you have the 700R but a 4L60E would be a much better match to the LS.

01-17-2020, 10:30 PM	#7
Captainfab 60-66 Nut Join Date: Mar 2007 Location: Coeur d'Alene, Idaho Posts: 23,246	Re: LS matted to a 700R4 The issue I see, is how to connect the 700R4's TV cable to the LS engine's throttle and getting the geometry correct. As already mentioned, a 4L60E or a 4L80E would be a much better choicer and much simpler to install and tune. __________________ Power Steering Box Adapter Plates For Sale HERE Power Brake Booster Adapter Brackets For Sale '63-'66 HERE and '67-'72 HERE and '60-'62 HERE and "60-'62 with clutch HERE Rear Disc Brake Brackets For Sale. Impala SS calipers HERE Camaro Calipers HERE D52 Calipers HERE 6 Lug HERE Hydroboost Mounting Plates HERE



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