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12/30/11 6:33pm - Original Message: 'Transmission Pressures'
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
In order for me to keep up my warranty on the 2004r trans I installed from Bowties I had to take pressure readings and give the readings to them so they can compare them to the run they did on the trans before they shipped it to me. All their transmissions are put in a car and test driven. So heres the pressures I have, At idle, about 900- 1000 RPM's in park-80, reverse-125, neutral-80, overdrive-80, third-80, second-150, first-140, now the next readings are at 1500 RPM's and pulling the TV cable to engage, park-180, reverse-175, neutral-185, overdrive-180, third-185, second-180, first-170. Last pressure test is with the TV cable disconnected, at idle, park-75, reverse-95, neutral-75, overdrive-75, third-75, second-90, first-85. Then they wanted to know, when sitting at idle in park if you slightly pull the TV cable does the pressure jump up and it does. So now I have been cleared to go on a test drive. That has to wait till monday morning since the headers dont have any other exhaust hooked to it yet but should have on monday unless something doesnt fit up. I have an appointment to have it made at 8 AM!
Now my question with all these pressure readings is how do or would they compare to others members using a 2004r trans and also what would a stock transmission produce at the same RPMS?

Cant wait to drive it to the exhaust shop with no pipes!Approve

I still have to call them back with some numbers from the test drive but I havent read that instruction sheet yet!


Rodney  

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12/30/11 8:15pm - Reply: 'Re: Transmission Pressures'
F4Gary Gold Member
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Grapevine, TX - USA

Vette(s):
1972 LT-1 convertible with factory air.

Joined: 8/26/2006
Posts: 872
Seems like a pain in the axx just to get their warranty.

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12/30/11 8:23pm - Reply: 'Re: Transmission Pressures'
Redwingvette Lifetime Member
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Waterford, MI - USA

Vette(s):
1973 Red coupe

Joined: 9/13/2002
Posts: 1676
Gear Selector Position Pressure @ Idle Pressure @ Idle * Pressure @ High Idle
  T. V. Connected T. V. Disconnected Full T. V.
Park 75 70 150+
Reverse 85 85 110
Neutral 70 70 150+
Overdrive 70 70 100
Third 65 70 100
Second 80 80 100
First 80 80 100
* Pressure @ High Idle 1500 rpm

Here is what info I got when i installed mine. The most important thing is that there has to be a slight increase in pressure when you attach the TV cable to the throttle plate. There has to a increase in pressure as soon as there is any movement in the throttle and that at full throttle the cable is completely pulled out.

Did you purchase one of their TV cable hook-ups? At the time they did not have one for my Holley carb so I had to make my own.

I have had no issues with my trans from them. I put it in back in the spring of 2003. 


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Brian - NCM Lifetime Member
          
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,
Leather seats, F-body seatbelts, Pioneer CD player
Magnaflow Exhuast System
Dewitt radiator and dual electric fans
Borgeson Steering box
Click here for Brian's Home Page 



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12/30/11 9:10pm - Reply: 'Re: Transmission Pressures'
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
Brian,
Yes I purchased their TV kit. It seems to be really easy to hook up. They have been great to work with as well. I cant wait to get it out on the road Monday to see how it acts. I bought their level 2 trans.


Actually it wasnt that bad getting the information for them. And to get a warranty with a performance type of equipment makes me feel good about their building of trannys. A lot of things you buy that are performance comes with no warranty. I bought this tranny from them back in August of 2010 and the warranty doesnt start till I get it in and give them my information. That means it sat for almost 16 months without being used and they will still honor the warranty.
I would like to know how these pressures compare to a stock 2004r trans as well.

Rodney


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12/30/11 9:10pm - Reply: 'Re: Transmission Pressures'
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
Brian,
Yes I purchased their TV kit. It seems to be really easy to hook up. They have been great to work with as well. I cant wait to get it out on the road Monday to see how it acts. I bought their level 2 trans.


Actually it wasnt that bad getting the information for them. And to get a warranty with a performance type of equipment makes me feel good about their building of trannys. A lot of things you buy that are performance comes with no warranty. I bought this tranny from them back in August of 2010 and the warranty doesnt start till I get it in and give them my information. That means it sat for almost 16 months without being used and they will still honor the warranty.
I would like to know how these pressures compare to a stock 2004r trans as well.

Rodney


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12/30/11 9:38pm - Reply: 'Re: Transmission Pressures'
Redwingvette Lifetime Member
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Waterford, MI - USA

Vette(s):
1973 Red coupe

Joined: 9/13/2002
Posts: 1676
What rear gear ratio are you using? I love having a 3.55. My car came with a 3.08 but I changed it to the 3.55. With the TH400 trans I would see about 3400rpm @ 70mph. Now I run about 2200rpm's. Gas mileage went from 11-12mpg up to 17-18mpg on the highway.
The 1st/2nd gears also help with low end power.

GEAR RATIOS OF THE TH-400

FIRST GEAR

SECOND GEAR

THIRD GEAR

FOURTH GEAR

2.48:1

1.48:1

1:1

N/A

 

 

 

 

 

GEAR RATIOS OF THE TH-2004R

FIRST GEAR

SECOND GEAR

THIRD GEAR

FOURTH GEAR

2.74:1

1.57:1

1:1

0.67:1



____________________________________
Brian - NCM Lifetime Member
          
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,
Leather seats, F-body seatbelts, Pioneer CD player
Magnaflow Exhuast System
Dewitt radiator and dual electric fans
Borgeson Steering box
Click here for Brian's Home Page 



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12/30/11 10:50pm - Reply: 'Re: Transmission Pressures'
yostusota
Former Member
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York, PA - USA

Vette(s):
1969 daytona conv. all original 350 350 380 4 sp w/air..and hard top

Joined: 5/18/2010
Posts: 1518
Wow...you've been busy!! Glad to hear your getting closer to being done...I would bet they are asking for the pressure changes to make sure you know how to set up the TV cable..if its hooked up to tight or to loose it can ruin a trans real quick..sounds nice having a TV cable hook up for the carb already made for you..the pressures you talked about don't sound all that extreme..especially reverse with full TV throttle..not sure what a stock 200 would be since I haven't touched one in years..really its the internal parts clearance on the clutch packs and the end play that help the most in durability..the other is what type of clutch and steel material used...that effects how much and how hard it shifts also..but really it all comes down to line pressure during shifts and the timing between the gear shift points..but that's a whole valve body and band servo hydraulic lesson my thumbs wouldn't make it thru!..big land and little land stuff..I may have an old GM rebuild book on one of these laying in one of my box drawers..I will take a look Monday and see if its still there...would give me something to look foward to to go in to work on Monday!

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My first parade at Carlisle 2010
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12/31/11 8:09am - Reply: 'Re: Transmission Pressures'
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
Brian,
like you I have a 308 in the car now but a 355 ready to install this winter. Once the exhaust is on I plan on making the change. We are going to be using the wrap clamps for exhaust that way I can take it apart easily whenever I need to work on anything.
Rich, I have been busy the lasy few weeks, Helps me keep m,y mind off of other things. Just to let you know I am calling it quits at the shop in the end of January. I offered it to Vern but he doesnt want any part of it. My body hurts to much to keep doing this line of work. As for the tranmission this should have the good clutches and materials in it. They make three upgrade choices. This trans is supposed to be good up to 550 HP. I hope the shifts sit me back in the seat! They have a very nice adjustment cam on the throttle made for the holley carb so I can adjust the shift from firm to more firm.
Rodney


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1/1/12 12:05pm - Reply: 'Re: Transmission Pressures'
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

Joined: 11/8/2003
Posts: 19459
http://sites.google.com/a/c3vrmail.com/tumbleweed-transmission/home/trans-stuff


Here are the stock pressure specs. The 2004R and 700R4 trans must see a pressure response instantly when moving the throttle. Think of it as a volume control knob...but NOT like one in a newer car, where you turn the knob, and the volume increases later. THink of it as an older radio, where the volume increases with ANY twist of the knob.

It's also not just about pressures on these swaps...the pressure is the main goal, but the throttle cable setting also controls WHEN the trans shifts, and how firm/soft. The TV cable, and governor weights/springs work together to create the best shift, at the proper time, according to how much pedal is touching the metal.
It's always better to have it shift late, and firm, than early and sloppy. Early and sloppy will burn it up quickly. Late and firm may make you spill yer coffee, but...what are you doing drinkin anything in yer Corvette anyway?LOL


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Joel Adams
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1/5/12 9:18am - Reply: 'Re: Transmission Pressures'
yostusota
Former Member
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York, PA - USA

Vette(s):
1969 daytona conv. all original 350 350 380 4 sp w/air..and hard top

Joined: 5/18/2010
Posts: 1518
Rodney..sorry to hear you are giving up the trade..well..not really!! Hope you find something that doesn't wear you out so much..doing this as a hobby would be ideal for me too..not much of an option though.. I did see the top on the car..is that the new one or the old one?? I'm sure the trans will work out fine..snappy but doesn't spill the beer...gotta love it.. Good post on the pressures Joel..I did find my old GM rebuild book.. good stuff.

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My first parade at Carlisle 2010
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