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9/21/09 4:08pm - Original Message: 'transmission'
tonyb47
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Suffern, NY - USA

Vette(s):
1976 restored,new interior,custom paint(purple),body kit,rebuilt engine,trans,upgraded sound system

Joined: 3/16/2005
Posts: 227

can anyone tell me if the 76 automatics came with a THM350 or 400 The restoration book I have for corvettes say a thm 350 and the way to tell them apart is the shape of the pan, the 350 uses a rectangle pan with one corner angled while the 400 is a irregular shape, does that sound correct

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9/21/09 4:38pm - Reply: 'transmission'
lukesvette Lifetime Member
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HOWELL, NJ - USA

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.

Joined: 5/18/2004
Posts: 6804
Correct Tony. Here's a good link to assist you:
 
 
LukesVette2009-09-21 13:39:37

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9/21/09 9:42pm - Reply: 'transmission'
cthulhu Lifetime Member
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Hot Springs, AR - USA

Vette(s):
69 Conv #'s Match 427, TKO-600, 3.36HD-Posi, T/T, PS, PB, PW, SP, Lthr, Comp Mag 270 & Pro Rlr Rockers, Edel Air-Gap RPM, BG SD 750 MS, MSD 6AL+Tach Dist+ Blaster SS+Wires, Hly Bl Fuel Pump, K&N, Jet-Hot Hkr Side-Pipes,Steeroids, Al Rad, Spal Fans

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http://www.vetteprojects.com/cthulhu/misc/transpan.gif


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9/21/09 10:42pm - Reply: 'transmission'
Adams' Apple Lifetime Member
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Duncanville, TX - USA

Vette(s):
#1-1974 L-48 4spd Cp Med Red Metallic/Black deluxe int w/AC/tilt/tele./p/w-p/b/ Am-Fm/map light National/Regional/Chapter NCRS "Top Flight" #2-1985 Bright Red/Carmine Cp.L-98/auto Member: NCRS, NCRS Texas, Corvette Legends of Texas

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For '76, the L82 engines used the 400, and the L48 used the 350...

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9/22/09 9:28am - Reply: 'transmission'
tonyb47
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Suffern, NY - USA

Vette(s):
1976 restored,new interior,custom paint(purple),body kit,rebuilt engine,trans,upgraded sound system

Joined: 3/16/2005
Posts: 227
thanks guys for links,I'm pretty sure my transmission is shot,won't shift into third and when I checked the fluid it was black, any suggestions where to get another transmission, I was looking in the summit catalog and they have tci's not bad price are they any good. Would I better off getting a new one or having mine rebuilt. I also checked jasper engines and a rebuilt 400 is $1390. and a 350 is $1276. and includes shipping and returning the core

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9/23/09 1:22am - Reply: 'transmission'
cthulhu Lifetime Member
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Hot Springs, AR - USA

Vette(s):
69 Conv #'s Match 427, TKO-600, 3.36HD-Posi, T/T, PS, PB, PW, SP, Lthr, Comp Mag 270 & Pro Rlr Rockers, Edel Air-Gap RPM, BG SD 750 MS, MSD 6AL+Tach Dist+ Blaster SS+Wires, Hly Bl Fuel Pump, K&N, Jet-Hot Hkr Side-Pipes,Steeroids, Al Rad, Spal Fans

Joined: 4/24/2004
Posts: 3194

I would suggest you take this as an opporunity to put in an OD auto trans



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9/24/09 1:00pm - Reply: 'transmission'
aceinthehole Lifetime Member
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Valley Springs, CA - USA

Vette(s):
1978,Metalic Money Green W/Gold emblems,TH350 w/gear splitter,black & grey interior.1978,two tone,Metalic Rootbeer & gold ,Doeskin interior,auto. trans. 1981, Silver w/mirrored T-Tops,4 spd, charcoal interior.

Joined: 11/20/2005
Posts: 3618
[QUOTE=cthulhu]I would suggest you take this as an opporunity to put in an OD auto trans[/QUOTE]
 
Seriously. A 700R4 will not only come off the line quicker ( due to the gear ratio difference) but once it kicks into overdrive the Rpms drop way off and makes for great freeway driving. A very worthwhile upgrade unless you mean to keep it numbers matching. Of course the conversion would cost a little more than a stock replacement.


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9/24/09 7:01pm - Reply: 'transmission'
cthulhu Lifetime Member
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Hot Springs, AR - USA

Vette(s):
69 Conv #'s Match 427, TKO-600, 3.36HD-Posi, T/T, PS, PB, PW, SP, Lthr, Comp Mag 270 & Pro Rlr Rockers, Edel Air-Gap RPM, BG SD 750 MS, MSD 6AL+Tach Dist+ Blaster SS+Wires, Hly Bl Fuel Pump, K&N, Jet-Hot Hkr Side-Pipes,Steeroids, Al Rad, Spal Fans

Joined: 4/24/2004
Posts: 3194
since you have a 350 now a well built 200r4 would be very easy and affordable

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9/25/09 9:13am - Reply: 'transmission'
tonyb47
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Suffern, NY - USA

Vette(s):
1976 restored,new interior,custom paint(purple),body kit,rebuilt engine,trans,upgraded sound system

Joined: 3/16/2005
Posts: 227
What are the differences and advantages for a 200r4

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9/25/09 11:37am - Reply: 'transmission'
Redwingvette Lifetime Member
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Waterford, MI - USA

Vette(s):
1973 Red coupe

Joined: 9/13/2002
Posts: 1674
Besides the OD it uses a lock-up convertor. When it is locked your trans runs cooler.
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.

Redwingvette2009-09-25 08:38:28

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73 coupe L48, Flat-top pistons, Performer RPM Heads, Crane Cam and roller rockers, Holley 650 vac sec. Performer intake,
3.55 gear BTO 200-4R trans,
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9/25/09 1:27pm - Reply: 'transmission'
2tonevette1981
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Hillsboro, TX - USA

Vette(s):
1981 beige/bronze

Joined: 3/2/2008
Posts: 147
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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9/26/09 1:29am - Reply: 'transmission'
cthulhu Lifetime Member
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Hot Springs, AR - USA

Vette(s):
69 Conv #'s Match 427, TKO-600, 3.36HD-Posi, T/T, PS, PB, PW, SP, Lthr, Comp Mag 270 & Pro Rlr Rockers, Edel Air-Gap RPM, BG SD 750 MS, MSD 6AL+Tach Dist+ Blaster SS+Wires, Hly Bl Fuel Pump, K&N, Jet-Hot Hkr Side-Pipes,Steeroids, Al Rad, Spal Fans

Joined: 4/24/2004
Posts: 3194
[QUOTE=Redwingvette]Besides the OD it uses a lock-up convertor. When it is locked your trans runs cooler.
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.

[/QUOTE]
 
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.


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9/26/09 1:35am - Reply: 'transmission'
cthulhu Lifetime Member
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Hot Springs, AR - USA

Vette(s):
69 Conv #'s Match 427, TKO-600, 3.36HD-Posi, T/T, PS, PB, PW, SP, Lthr, Comp Mag 270 & Pro Rlr Rockers, Edel Air-Gap RPM, BG SD 750 MS, MSD 6AL+Tach Dist+ Blaster SS+Wires, Hly Bl Fuel Pump, K&N, Jet-Hot Hkr Side-Pipes,Steeroids, Al Rad, Spal Fans

Joined: 4/24/2004
Posts: 3194
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


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9/26/09 2:37pm - Reply: 'transmission'
tonyb47
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Suffern, NY - USA

Vette(s):
1976 restored,new interior,custom paint(purple),body kit,rebuilt engine,trans,upgraded sound system

Joined: 3/16/2005
Posts: 227
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.

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9/26/09 3:03pm - Reply: 'transmission'
aceinthehole Lifetime Member
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Valley Springs, CA - USA

Vette(s):
1978,Metalic Money Green W/Gold emblems,TH350 w/gear splitter,black & grey interior.1978,two tone,Metalic Rootbeer & gold ,Doeskin interior,auto. trans. 1981, Silver w/mirrored T-Tops,4 spd, charcoal interior.

Joined: 11/20/2005
Posts: 3618
[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 ! Ouch I see what you mean. Who's got that kinda money lying around.


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Jimmy B.
Just can't wait to get on the road again.

 
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9/26/09 5:48pm - Reply: 'transmission'
rod7515 Lifetime Member
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Red Lion, PA - USA

Vette(s):
1974 White 350 Corvette, TH400 Automatic 1972 Tangerine /Go Mango Convertible 383 Stroker, 2004r Automatic

Joined: 10/27/2006
Posts: 1172
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.




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9/27/09 12:32am - Reply: 'transmission'
cthulhu Lifetime Member
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Hot Springs, AR - USA

Vette(s):
69 Conv #'s Match 427, TKO-600, 3.36HD-Posi, T/T, PS, PB, PW, SP, Lthr, Comp Mag 270 & Pro Rlr Rockers, Edel Air-Gap RPM, BG SD 750 MS, MSD 6AL+Tach Dist+ Blaster SS+Wires, Hly Bl Fuel Pump, K&N, Jet-Hot Hkr Side-Pipes,Steeroids, Al Rad, Spal Fans

Joined: 4/24/2004
Posts: 3194
[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]
 
the difference in the ratios between a 350 and 400 are insignifiant
 
350 = 2.52 in 1st
400 = 2.48
 
 


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11/21/09 10:37am - Reply: 'transmission'
tonyb47
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Suffern, NY - USA

Vette(s):
1976 restored,new interior,custom paint(purple),body kit,rebuilt engine,trans,upgraded sound system

Joined: 3/16/2005
Posts: 227
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.

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11/21/09 11:28am - Reply: 'transmission'
lukesvette Lifetime Member
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HOWELL, NJ - USA

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.

Joined: 5/18/2004
Posts: 6804
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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