LT1/700r4 Question
Thread Starter
Advanced
Joined: Sep 2010
Posts: 60
Likes: 0
From: Prichard WV
LT1/700r4 Question
Hello,
Before I get bashed for not using this website's search engine, I want to say I have been looking for quite sometime for the answer to my question. Maybe I'm not smart enough to figure out how to find it in the archives, but here goes..............
I am putting an lt1 from an impala ss into my 1984 vette. I know the ls series is superior and all that, but this fell in my lap, & since my 84's crossfire engine has a huge hole in the block, I'm performing the surgery. I have the harness repinned and ready to go - I will send the ECM off to be reprogrammed (it came from the impala) but my question is this: If I'm deleting transmission activity (700r4) from the ECM and going with a Jegs/Summit kit for lock up, how do I get the speedo to work? I assume there is a speed sensor on the current setup with the CFI - I'm not very familiar with this type of swap and just need to make sure I can get the speedo to work.
Thanks,
Rich
Before I get bashed for not using this website's search engine, I want to say I have been looking for quite sometime for the answer to my question. Maybe I'm not smart enough to figure out how to find it in the archives, but here goes..............
I am putting an lt1 from an impala ss into my 1984 vette. I know the ls series is superior and all that, but this fell in my lap, & since my 84's crossfire engine has a huge hole in the block, I'm performing the surgery. I have the harness repinned and ready to go - I will send the ECM off to be reprogrammed (it came from the impala) but my question is this: If I'm deleting transmission activity (700r4) from the ECM and going with a Jegs/Summit kit for lock up, how do I get the speedo to work? I assume there is a speed sensor on the current setup with the CFI - I'm not very familiar with this type of swap and just need to make sure I can get the speedo to work.
Thanks,
Rich
Race Director
Joined: Apr 2003
Posts: 17,700
Likes: 1,667
From: moraga ca
If I were you, I would use the earlier speedosensor with your 700R4. Use the 2 gears to match your rearend. You might need to use your old rear housing, I can't remember. You will still be able to use your speedo. I don't believe the Summit lock up controller uses the speedo signal but I might be wrong. I am running a 4l60e in my 84 and needed to switch over the the later electronic pulse signal speedosensor for my TCI controller to work. My speedo is inop because the car is a strip only car. There is a box to convert this signal to the older signal but since my car is not on the street, I didn't need the speedo, just timeslips.
Pro
Joined: Dec 2009
Posts: 502
Likes: 0
Hello,
Before I get bashed for not using this website's search engine, I want to say I have been looking for quite sometime for the answer to my question. Maybe I'm not smart enough to figure out how to find it in the archives, but here goes..............
I am putting an lt1 from an impala ss into my 1984 vette. I know the ls series is superior and all that, but this fell in my lap, & since my 84's crossfire engine has a huge hole in the block, I'm performing the surgery. I have the harness repinned and ready to go - I will send the ECM off to be reprogrammed (it came from the impala) but my question is this: If I'm deleting transmission activity (700r4) from the ECM and going with a Jegs/Summit kit for lock up, how do I get the speedo to work? I assume there is a speed sensor on the current setup with the CFI - I'm not very familiar with this type of swap and just need to make sure I can get the speedo to work.
Thanks,
Rich
Before I get bashed for not using this website's search engine, I want to say I have been looking for quite sometime for the answer to my question. Maybe I'm not smart enough to figure out how to find it in the archives, but here goes..............
I am putting an lt1 from an impala ss into my 1984 vette. I know the ls series is superior and all that, but this fell in my lap, & since my 84's crossfire engine has a huge hole in the block, I'm performing the surgery. I have the harness repinned and ready to go - I will send the ECM off to be reprogrammed (it came from the impala) but my question is this: If I'm deleting transmission activity (700r4) from the ECM and going with a Jegs/Summit kit for lock up, how do I get the speedo to work? I assume there is a speed sensor on the current setup with the CFI - I'm not very familiar with this type of swap and just need to make sure I can get the speedo to work.
Thanks,
Rich
The 700r4 changed twice of the life span of the LT1. Have you gone to an Impala website and asked this question?
You will need to get a LT1 radiator.
Thread Starter
Advanced
Joined: Sep 2010
Posts: 60
Likes: 0
From: Prichard WV
So, will the speed sensor work with the digital speedometer WITHOUT going through the ECM?
Also, you mentioned needing an LT1 Radiator. I feel stupid for asking, but why wont my stock radiator in my 84 work?
Thanks Again- It's hard for me to ask about these things because I feel dumb as I have no experience with this type of swap. I appreciate everyone's patience with me.
Last edited by bootlegpass; Sep 13, 2010 at 05:00 PM. Reason: computer shut off before I was finished
Race Director
Joined: Apr 2003
Posts: 17,700
Likes: 1,667
From: moraga ca
Yes, the speed sensor goes to the dash. I swapped from a 4+3 to a 700r4 with an aftermarket computer and the speedo worked. It was only after the 4l60e swap that I lost the speedo. Your radiator will work fine. Just need to fit the right hoses.
Corvette Stories
The Best of Corvette for Corvette Enthusiasts
Every 2027 Corvette Engine Explained
Joe Kucinski
Designer Imagines A Corvette That Looks More Like a Corvette Than the Corvette
Verdad Gallardo
10 Ugly Corvettes That We Still Kinda Love
Joe Kucinski
Top 10 Most Expensive Corvettes Ever Sold on Bring A Trailer
Brett Foote
10 Things Every Corvette Owner Needs (2026 Edition)
Michael S. Palmer
8 Most "Only Corvette Owners Understand" Quirks and Problems
Pouria Savadkouei
10 Reasons the C6 Z06 is Still A Performance Benchmark After 20 Years
Joe Kucinski
How Much Horsepower Every Corvette Engine "LOST" in 1972
Joe Kucinski
Top 10 DOs and DON'Ts for Protecting Your Convertible Top!
Michael S. Palmer
Thread Starter
Advanced
Joined: Sep 2010
Posts: 60
Likes: 0
From: Prichard WV
Well, after talking to athe dude at LT1 swap.com, I'm kinda confused again. He suggested using a Dakota Digital speed senssor so the computer will know the car is moving. Has anyone had experience with this? Also, how would it hook up to accomodate the speedo in the dash and in the computer?
