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A member mentioned I might want to add you to this thread as you might have insight?
Sorry I have no idea. If it were me, pull the trans and sell the 700, then put in the correct 400 trans, or wedge an electronic 4L80E in there if it would fit though that means another trans computer to control it. I've only tinkered with 200's. I know enough that my trans builder walked me through converting my 2004r to non-lockup but I took out a power valve instead of some other TCC valve thing on the other side of the pump since I was under the car.
It appears they used a Shift-Works conversion kit on the car since the shifter was properly fixed for the 1st gear select feature. It was not a Bubba job, thank goodness.
The 700R4 came with my C4 and it has been a great transmission for my Corvette. What makes a "400" transmission any better in a Corvette? My C4 coupe can get 30 mpg on flat highways at 60 mph using the 700R4 and a 3.07 rear end. That is with A/C a-blowing and good music playing.
A buddy of mine had a Grand National as well as a 1964 GTO with a 389, 6 pack and four speed. He liked fast cars until I gave him a "ride" in my L88 clone. In a matter of minutes he was begging me to back down and slow down, going fast in a Corvette was an experience he won't forget. We were on an autocross track and it was safe to go fast. He told me after that my C3 would destroy either of his toys on the highways and that my C3 was the most powerful car he had been in. Now my friends appreciate my C3 and won't make jokes about slow Corvettes.
It appears they used a Shift-Works conversion kit on the car since the shifter was properly fixed for the 1st gear select feature. It was not a Bubba job, thank goodness.
The 700R4 came with my C4 and it has been a great transmission for my Corvette. What makes a "400" transmission any better in a Corvette? My C4 coupe can get 30 mpg on flat highways at 60 mph using the 700R4 and a 3.07 rear end. That is with A/C a-blowing and good music playing.
A buddy of mine had a Grand National as well as a 1964 GTO with a 389, 6 pack and four speed. He liked fast cars until I gave him a "ride" in my L88 clone. In a matter of minutes he was begging me to back down and slow down, going fast in a Corvette was an experience he won't forget. We were on an autocross track and it was safe to go fast. He told me after that my C3 would destroy either of his toys on the highways and that my C3 was the most powerful car he had been in. Now my friends appreciate my C3 and won't make jokes about slow Corvettes.
thank you for that info.
Last edited by c1nicole; Jul 16, 2024 at 06:42 PM.
c1nicole
Note that statement that not ALL 700-R4s, nor all 200-4Rs, have that port. No big deal anyway. You can use an internal pressure switch without a computer of any sort. If you find your self there just ask.... my 200-4R uses just an internal pressure switch..... I don't even have a vacuum interface with it.
c1nicole
Note that statement that not ALL 700-R4s, nor all 200-4Rs, have that port. No big deal anyway. You can use an internal pressure switch without a computer of any sort. If you find your self there just ask.... my 200-4R uses just an internal pressure switch..... I don't even have a vacuum interface with it.
c1nicole
Only from research on carbs, not from my personal experiience, since my engine is RamJet 350....
First thing though..... Lars should be able to guide you to the appropriate adapter with the correct geometry to operate a 700-R4.
But otherwise we have other ways to determine the appropriate adapter for the carb.
Once you have the carb contraption with the correct geometry then setting up the TV cable is easy. I recommend getting a pressure gauge to monitor pressure when you first use and as you get used to it. I was so afraid of damaging my tranny that I intentionally kept my pressure slightly high to begin with.
I did all kinds of silly exercises trying to adjust my TV Cable and in the end it was way out of whack by the time I got around to dropping my pan to change the governor on my 200-4R.
At that point I pointed my USB (endoscope type) camera right at the SLUG which the TV Cable manipulates, plugged the cord into my laptop up by the throttle, and displayed what was going on in the engine compartment on my laptop (you can also use a phone I just wanted a bigger screen), and adjusted the tv cable travel from just kissing the slug when secured, to WOT and the slug fully depressed. I'll go get some pictures so you can see what I mean. ...gimme a sec.
Originally Posted by c1nicole
Thank you so much for sharing your knowledge.
Can you shine some light on the TV cable that will need to be run to the quadrajet carb Lars built for me?
See the pictures below.
If I would have thought about it I would have used my USB Endoscope camera initially. I already owned one. They're only a couple of bucks on amazon.
When the throttle is released the lever should just be "kissing" the slug.
I made a mark on my slug just to see where the midpoint was.
When at Wide Open Throttle (WOT) the slug should be fully depressed.
You will note that this is dependent on the travel path/distance that the cable covers as throttle is opened. My Ramjet 350 already came with the appropriate setup so once I had the camera setup it was easy peasy..... the pressure gauge I had installed to being with let me know I was not dropping pressure to where it would damage the tranny.
I will attach a separate picture of the throttle body & cable so you can see what I mean.
I hope this clear. If you're curious, and have a boneyard nearby you can go eyeball some 80s cars with TV cables but really somebody here will have a picture of Q-Jet being used with a TV Cable......
Last edited by carriljc; Jul 19, 2024 at 12:58 AM.
c1nicole
And here is what the other end of the tv cable looks like on my RamJet. The cardboard is there to eliminate background clutter.......I made some marks on the TV cable sheath so that I can put it back if I ever have to remove it. I also took multiple pictures with a ruler showing measurements: https://www.corvetteforum.com/forums...post1605530349
Last edited by carriljc; Jul 19, 2024 at 01:09 AM.
c1nicole
There is also a kit made by Bowtie Overdrives called "TV made EZ" which some folks rave about........ but really....... it's not that hard anyway if you have the right carb adapter.
Seems steep to me but if it works...what the hey. Quadrajet kits.... https://www.bowtieoverdrives.com/cat...AT&CATID=WA3A4
c1nicole
There is also a kit made by Bowtie Overdrives called "TV made EZ" which some folks rave about........ but really....... it's not that hard anyway if you have the right carb adapter.
Seems steep to me but if it works...what the hey. Quadrajet kits.... https://www.bowtieoverdrives.com/cat...AT&CATID=WA3A4
Very cool information and the video is very helpful as this stuff is WAY over my head, but I am learning!
Going to look and see if any of that is on the car.
I just put in the automatic within the last couple of years. It was all WAY OVER my head too. I came here and asked questions and there's lots of folks here that have forgotten more than I have learned.
As you can see it isn't terribly difficult if you have the correct parts.
Check your carb to ENSURE that you have the appropriate TV Cable Lever .... that would be the larger annoyance. No biggie anyway since I think(?) some 200-4Rs were used with carburetors or TBI units? --- you'd just have to find which ones for checking to see if you have the appropriate design on your carb.
Originally Posted by c1nicole
Very cool information and the video is very helpful as this stuff is WAY over my head, but I am learning!
Going to look and see if any of that is on the car.
Last edited by carriljc; Jul 21, 2024 at 10:37 PM.
c1nicole
I saved a bunch of webpages while doing my Manual to Auto conversion. Just found this one in my bookmarks. It explains the bracket issue on the carb...this link take you directly to the modification page but you can page through the whole thing for entertaining info:
c1nicole
I saved a bunch of webpages while doing my Manual to Auto conversion. Just found this one in my bookmarks. It explains the bracket issue on the carb...this link take you directly to the modification page but you can page through the whole thing for entertaining info:
You're welcome.
Lotsa crap for sale that isn't really needed..... Like 100 bucks for that silly detent plate for the shifter. I just "had to" to try and modify it myself. Egad. Took like 10 minutes and I was going slow...... I was willing to buy the goofball plate but I had to try first... I figured I could buy one if I screwed it up.... but really, nothing to screw up.
Just remember that if you have a hard time with the TV Cable look into the bowtie overdrives TVMade easy thing.... allegedly wonderful..... and don't wanna burn up your tranny.
Where did the carb in the ABOVE picture come from? Who put that contraption on there?
I would ask Lars directly about the carb he built for you. I suggest sending him a pic of the carb that HE built for you and ask him if it is the correct contraption to use with a 700-R4.
Where did the carb in the ABOVE picture come from? Who put that contraption on there?
I would ask Lars directly about the carb he built for you. I suggest sending him a pic of the carb that HE built for you and ask him if it is the correct contraption to use with a 700-R4.
No idea.
Lars is aware. The carb will be replaced soon. Just have to get other things completed.
