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: 17,697
Likes: 1,666
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: 17,697
Likes: 1,666
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
10 Revolutionary 'Corvette Firsts' Most People Don't Know
Joe Kucinski
5 Reasons to Upgrade to an LS6-Powered Corvette; 5 Reasons to Stay LT2
Michael S. Palmer
2027 Corvette vs The World: Every C8 vs Its Closest Competitor
Joe Kucinski
10 Most Common Corvette Problems of the Last 20 Years!
Joe Kucinski
5 MOST and 5 LEAST Popular Corvette Model Years in History!
Joe Kucinski
2027 Corvette Buyer's Guide: Everything You Need to Know!
Joe Kucinski
10 Things C8 Corvette Owners Hate (But Won't Tell You)
Joe Kucinski
10 Best Corvettes Coming to Barrett-Jackson Palm Beach 2026!
Brett Foote
Every Corvette Grand Sport Explained! (C2, C4, C6, C7, & C8)
Joe Kucinski
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?
