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Old 01-10-2010, 05:14 PM   #1
1974, 1994 c
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upgrade a c3 with c4 drivetrain

hey guys I have a ? for you. I just totalled my 94 but i can save pretty much everything off of her, and im working on a 75 right and was wondering how much from the c4 I can put on my c3. any suggestions. I would like to put the rear end in it and the front end along with the motor and trans its a 6 speed
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Old 01-10-2010, 05:53 PM   #2
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You won't regret it!
By far the best upgrade you can do to improve your c-3.
It's not that hard to do either.
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71 vert on C-4 suspension.(355ci, Twin turbos.GONE)
SOON TO BE 6.0 Gen III Twin turbos.TKO 600
Old 01-10-2010, 06:00 PM   #3
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well the 75 is stripped down to body on frame and the front end of my 94 is gone but the suspensions is good so i have everything i would need i think but i just dont know how to go about it
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Old 01-10-2010, 06:31 PM   #4
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The suspension is modular and will unbolt and come out in one piece with the cradle.Most of the conversions here are frame conversions that have been bought.They are beautiful!
I converted my own frame and though it's not as pretty it works great.I saved alot of green,but I have done everything on this car myself and have the need to finnish it alone.
Just a challenge to myself!If you have some basic fab knowledge and the drive to make it happen you can do it.
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71 vert on C-4 suspension.(355ci, Twin turbos.GONE)
SOON TO BE 6.0 Gen III Twin turbos.TKO 600
Old 01-10-2010, 06:50 PM   #5
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ya thats how i am. i do all the work on my vettes myself its fun vents some steam ect. plus saves a ton of money. i just hate to have to scrap my 94 cause i built it from the ground up after i came back from iraq and now i have this 75 that i have been working and it hit me to mod the 75 with 94 lol ill post pictures later but im also parting my 94 out as well
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Old 01-10-2010, 06:55 PM   #6
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hey i hate to bother you but if you have more pictures of you mod that would help alot
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Old 01-10-2010, 07:16 PM   #7
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Cool idea! I'd love to see the step by step transformation if you go that route!
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I'm taking care of my procrastination issues, just you wait and see.
Old 01-10-2010, 07:22 PM   #8
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its going to happen just need the specs and the list of parts or brackets i need to make
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Old 01-10-2010, 11:00 PM   #9
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I did my conversion back in 2003.(I still have not built my shock brackets! I might switch to coilovers)
I did'nt keep a list of brackets or specs on it.I do know that there were a few different ways That I could have went on angles and ride height concerning the placement of the front (Weight ect,).
There are too many things that will very on the springs and vehicle weights to just start spitting out numbers.I made my choices at the time base on what I wanted and needed for my car at the time.There will be a point where you will need to set, and reset the new front to your needs.(basicly set it up as it would be in the C-4 under full weight of the car, keeping the same set as factory.)Customs very on weight!
(This is actually a plus compaired to a prebuilt unit if you know what you need)
You will be able to set the ride height and so on before you mount anything permanently.You will need to build a frame jig for the front half of the frame.(I can help there)
This conversion will require that you cut the frame rails on your car and totally remove the section of frame and cradle where the frame widens for the springs.
(I can only show you where I cut mine)
This will require tons of measuring and planning on your part,however I was able to do this alone in a weekend.
Again,It's not hard,just requires basic fab skills.
(I would suggest a friend to help!)
I'm sure that someone has done a play by play on this by now on the internet somewhere.The C-4 front suspension will fit anything with framerails!This is not a bolt on job and you will need a few good tools.Welder,plasma cutter/torch set, portaband, and chop saw.
(And BIG kahounas)

Last edited by Show; 01-11-2010 at 05:34 PM.
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71 vert on C-4 suspension.(355ci, Twin turbos.GONE)
SOON TO BE 6.0 Gen III Twin turbos.TKO 600
Old 01-10-2010, 11:14 PM   #10
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71 vert on C-4 suspension.(355ci, Twin turbos.GONE)
SOON TO BE 6.0 Gen III Twin turbos.TKO 600
Old 01-10-2010, 11:24 PM   #11
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thanks for the post. you would think some has done one but i searched for a few hours and didnt find a thing but i did find something along the lines from the old daytona vettes the did a 5 link rear end and looks like science behind is good enough but your right it all comes down to measureing alot and frabing. i have everything in my garage except space lol. but im planning on moving my 94 out once i get everything off it i wantand should give me enough space to get the frame out so i can do the frame work. thanks again for the help
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Old 01-11-2010, 06:04 AM   #12
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You can buy a new frame that is made just for this purpose. Will mount a C3 body and also will bolt on the C4 suspension, drive train, etc.. The new frame would be the key and since you have everything apart it would be easier. I'm not sure of the cost of the frame but if you were going to put money somewhere that would be it. Straight car that sat and drove perfectly. Would be nice to mount the brakes with the right abs setup, etc.. A real daily driving C3!

Search google or something for "Corvette Frame"

they did this in a couple magazines a while back too. I think Corvette Fever is one if you can search for that.
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Old 01-11-2010, 06:21 AM   #13
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I saw a tv show on this a while back.. If I can remember/find it, I'll post a link about it.
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Old 01-11-2010, 07:20 AM   #14
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do a search for threads started by Turbo84. He's put C4 suspension under his '69. There are a lot of threads to sift through here, but it might be a start:
http://www.digitalcorvettes.com/foru...archid=1628137
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Old 01-11-2010, 07:48 AM   #15
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Frame is key to have all the right geometry and ease of install of all the right parts.

I think on the 75 you can use a "vintage air" system too. It is an entire new AC and heating unit computer controlled that bolts in and uses the stock controls on the dash. again, cost may be an issue, but do it once and do it right as they say...
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