Topic: transmission
in Forum: C3 Driveline Components
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I just did the conversion to 700R4 and it is great...you can read all the specks http://www.c3vr.com/forum/topic78729.html. Is really not that hard to do with a little patience and some help from the guys here.
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Lifetime MemberHot Springs, AR - USA
Joined: 4/24/2004
Posts: 3236
Vette(s): 69 Conv #'s match 427, TKO-600/.64, 3.36HD-Posi, HT, T/T, PS, PB, PW, SP, Leather, Comp XE264HR & Roller Rockers & Lifters, Air-Gap RPM intake, Holley St Av 770 VS, MSD 6AL+Dist+Blaster SS, K&N, Jet-Hot Hooker Side-Pipes, Steeroids, Al Rad, Spal Fans
[QUOTE=Redwingvette]Besides the OD it uses a lock-up convertor. When it is locked your trans runs cooler.
[/QUOTE]
They also have different 1st and 2nd ratios that improve take-off's.
200-4R: 2.74 first, 1.57 second, 1.00 third, .67 fourth
Turbo 400: 2.48 first, 1.48 second, 1.00 third.
Turbo 350: 2.52 first, 1.52 second, 1.00 third
The advantage to using the 200-4r as a replacement is the size. It will fit in your car without having to change the crosmember or driveshaft length. You wil need to bend the trans cooling lines a little to get them to line up with the trans and you will need to hook up a TV cable. The shifter detent will need to be altered or replaced to match the trans shift locations. I bought my setup from http://Bowtieoverdrives.com but there are others that do the same thing.
to put this in perspective...
lets use a th350 with 3.36 gears as a baseline.
first gear ratio final ratio is 8.46
and top gear is 3.36
with the 200r4...
first gear = 9.2064
then divde this by 2.52 and you get 3.6533
so a 200r4 with 3.36 gears comes off the line like a th350 with 3.70 gears
this is a very respectable change.
then at the top end..
a 200r4 with its .67 od * 3.36
runs like a th350 with 2.25 gears in the top end.
the 700r4 has a very deep 3.06 first gear
with a 3.36 final ratio is 10.2816, when divded by 2.52 yields 4.08
so a 700r4 with a 3.36 comes off the line like a th350 with a 4.11 rear end.
Lifetime MemberHot Springs, AR - USA
Joined: 4/24/2004
Posts: 3236
Vette(s): 69 Conv #'s match 427, TKO-600/.64, 3.36HD-Posi, HT, T/T, PS, PB, PW, SP, Leather, Comp XE264HR & Roller Rockers & Lifters, Air-Gap RPM intake, Holley St Av 770 VS, MSD 6AL+Dist+Blaster SS, K&N, Jet-Hot Hooker Side-Pipes, Steeroids, Al Rad, Spal Fans
if you have tons of money and want to build a cool toy..
install a 6l80
this thing could turn a very pedestrian 2.73 or 3.08 rear end car into a screamer with its 4.027 1st gear producing final drives of 10.993 and 12.40 respectively
Money is a issue I wasn't prepared for this, all these upgrades sound great, but i can't do it myself and have to pay for the labor and parts. A local shop was refered to me and yesterday I visited the shop and found out the owner has 3 corvettes. A frame off total restoration on a 72 conv, a c4 ZR1, and hes working on a 66 now. Has been rebuilding transmissions for 25 years and knows corvettes. He suggested reusing my transmissin and quoted me a price of $1700. for rebuilding my transmission and torgue conv, and taking it out and reinstalling it.
Lifetime MemberManteca, CA - USA
Joined: 11/20/2005
Posts: 3623
Vette(s): 1978,two tone,Metalic Rootbeer & gold
1975 L48 4 speed
[QUOTE=tonyb47]Money is a issue I wasn't prepared for this, all these upgrades sound great, but i can't do it myself and have to pay for the labor and parts. He suggested reusing my transmissin and quoted me a price of $1700. for rebuilding my transmission and torgue conv, and taking it out and reinstalling it.[/QUOTE]
OUCH ! 
I see what you mean. Who's got that kinda money lying around.
I see what you mean. Who's got that kinda money lying around.Jimmy B.
Just can't wait to get on the road again. 
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i dont want to steal anyones thread but this leaves me with some questions, when you do the 200r change over does that shifter stay the same or does that have to be change. I have been told to do this change as well when I do a trans which will be in the next year. what ratio changes will i see going from the 400 from stock to a 200r? mine is a 74.
Lifetime MemberHot Springs, AR - USA
Joined: 4/24/2004
Posts: 3236
Vette(s): 69 Conv #'s match 427, TKO-600/.64, 3.36HD-Posi, HT, T/T, PS, PB, PW, SP, Leather, Comp XE264HR & Roller Rockers & Lifters, Air-Gap RPM intake, Holley St Av 770 VS, MSD 6AL+Dist+Blaster SS, K&N, Jet-Hot Hooker Side-Pipes, Steeroids, Al Rad, Spal Fans
[QUOTE=rod7515]i dont want to steal anyones thread but this leaves me with some questions, when you do the 200r change over does that shifter stay the same or does that have to be change. I have been told to do this change as well when I do a trans which will be in the next year. what ratio changes will i see going from the 400 from stock to a 200r? mine is a 74.
[/QUOTE]
[/QUOTE]
the difference in the ratios between a 350 and 400 are insignifiant
350 = 2.52 in 1st
400 = 2.48
Finally dropped my 76 off at the shop to have the transmission rebuilt. This guy has done frame off restorations on a c2 and a c3 72 conv and has been rebuilding transmissions for 25 years. he told me years ago he would do 3 or 4 of these a month but now hardly does any. Now he does hondas and toyotas and everything else. I stopped by after the trans was out and he showed me third gear was shot. Since he has the exhaust off I'm also getting my composite spring installed with kyb gas shocks. I'm having all 6 universals replaced,new shock mounts,strut rods and shock mounts.I'm also having insulation installed over the trans with a foam collar, can't wait to drive it. Thanks guys for all the information.
Lifetime MemberHOWELL, NJ - USA
Joined: 5/18/2004
Posts: 6812
Vette(s): 1979, Targa Blue (72 Color), Pace Car rear spoiler, L88 hood, Dark blue factory interior, 525HP 406, HD 700R4, 370 gears,Steeroids, composite rear spring, TT IIs wrapped in T/A Radials.
Tony, I just missed you on this one. I decided last week to do the 700R4 conversion. My TH350 was rebuilt less than 1000 miles ago with all HD parts and I have a new TCI converter in it that has seen less miles than the trans. Letting the whole set up go for $750. Chirps second every time...
Good luck with the rebuild!
Paul
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