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Old 06-05-2006, 09:42 AM
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700R4 pressures

I have installed a Mad Dog 700R4 transmission behind my Stroked 350 with a tri power set up I am looking for suggestions for correctly setting the Braided aftermarket TV cable. The research I have found suggest the safest way to set it is to use a pressure gauge on the trans and set the linkage to produce 70 psi at idol then disconnect the TV cable and pull it out until I get 175 psi mark the cable at this point for reference then modify the carb linkage geometry if necessary to get the 70 psi at idol and the 175 psi point at WOT. Any other ideas or suggestions? are these pressures correct?

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Old 06-05-2006, 10:29 AM
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From what I have read the pressures you quote are OK. Also from what I have read it is important that you adjust the cable so you get a pressure rise right off idle, and make sure the TV cable is not limiting WOT.

Vince
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Old 06-05-2006, 08:58 PM
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mad dog 700r4 godfather

Just wanted to know what you think about the tranny that mad dog built? The reason why, I installed the godfather in my 67 camaro and having problem setting the tv cable. It won't kickdown when giving throttle. It also leaks where the "plastic" speedo gear is. Did you have any leaks?
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Old 06-06-2006, 06:08 AM
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Quote:
Originally Posted by Danscam
Just wanted to know what you think about the tranny that mad dog built? The reason why, I installed the godfather in my 67 camaro and having problem setting the tv cable. It won't kickdown when giving throttle. It also leaks where the "plastic" speedo gear is. Did you have any leaks?
Its too early to tell on the Mad Dog no leaks but still looking for information on setting up the TV cable I am looking for a Trans pressure test gauge and figure on setting the cable up by pressure. I hope to find one at Good Guys Indy this weekend. I am still hoping to get some more feed back on the pressure range for this trans!
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Old 06-06-2006, 06:27 PM
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Quote:
Originally Posted by Danscam
Just wanted to know what you think about the tranny that mad dog built? The reason why, I installed the godfather in my 67 camaro and having problem setting the tv cable. It won't kickdown when giving throttle. It also leaks where the "plastic" speedo gear is. Did you have any leaks?
I too have a few leaks on mine from that same location. I am going to try a bit of teflon paste and see if that doesn't fix it.
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Old 06-06-2006, 06:38 PM
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Quote:
Originally Posted by Not A T 25
I am still hoping to get some more feed back on the pressure range for this trans!

what does the builder tell you the pressures should be? that is what I would worry about
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Old 06-06-2006, 08:26 PM
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Quote:
Originally Posted by Crosley
what does the builder tell you the pressures should be? that is what I would worry about
I called them and was disappointed they only said the 70 psi at idol and 175 psi at WOT sounded OK their only recommendation was to set the cable full out at WOT. I know I can do that but want to verify the pressure just to be sure the linkage geometry for my tri power is correct. Guess I could buy a service manual but hate to just for the pressures. Is there a high low range I could set to the middle?
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Old 06-06-2006, 08:32 PM
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Quote:
Originally Posted by Not A T 25
I called them and was disappointed they only said the 70 psi at idol and 175 psi at WOT sounded OK their only recommendation was to set the cable full out at WOT. I know I can do that but want to verify the pressure just to be sure the linkage geometry for my tri power is correct. Guess I could buy a service manual but hate to just for the pressures. Is there a high low range I could set to the middle?

I do not understand your "set to the middle comment".

The pressure will rise and falll with the throttle. There is no setting to the middle.

Pressures an the 700's I build run 90 - 100 at idle (minimum TV ) then up to 300 psi at MAX TV if I really lean on the PR boost valve setup I install.

Higher pressures increase operating temps of the oil and stress / wear on the pump.
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Old 06-06-2006, 08:44 PM
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Quote:
Originally Posted by Crosley
I do not understand your "set to the middle comment".

The pressure will rise and falll with the throttle. There is no setting to the middle.

Pressures an the 700's I build run 90 - 100 at idle (minimum TV ) then up to 300 psi at MAX TV if I really lean on the PR boost valve setup I install.

Higher pressures increase operating temps of the oil and stress / wear on the pump.
I guess that is what I am looking for the pressure ranges for example 90 - 100 at idol and the range for WOT. The only thing I could find on the internet said 70 psi at idol and 175 psi WOT. is there a spec range for the 700R4? I was planning on setting it at idol and the marking the cable at the appropriate pressure for WOT then verifying my linkage. Am I making this too difficult I have been told over and over how critical it is. What is you opinion?
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Old 06-06-2006, 08:55 PM
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Quote:
Originally Posted by Not A T 25
I guess that is what I am looking for the pressure ranges for example 90 - 100 at idol and the range for WOT. The only thing I could find on the internet said 70 psi at idol and 175 psi WOT. is there a spec range for the 700R4? I was planning on setting it at idol and the marking the cable at the appropriate pressure for WOT then verifying my linkage. Am I making this too difficult I have been told over and over how critical it is. What is you opinion?
main pressure of the 700 is a combo of PR spring , 2 different boost valves and the line bias circuit. They all work together .

GM used at least 5 different main boost valve sizes... from a .365 to a .471. 3 or 4 different low/reverse boost valves were used. Aftermarket main boost valves run up to .575

GM engineered the TV cable to be at full pull at WOT ........period. Pressures and shift points are controlled with different springs and valve sizes in the v-body and governor.

175 psi at max TV is a pressure I think of for a modest HP street application.
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Old 06-06-2006, 09:04 PM
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Quote:
Originally Posted by Crosley
main pressure of the 700 is a combo of PR spring , 2 different boost valves and the line bias circuit. They all work together .

GM used at least 5 different main boost valve sizes... from a .365 to a .471. 3 or 4 different low/reverse boost valves were used. Aftermarket main boost valves run up to .575

GM engineered the TV cable to be at full pull at WOT ........period. Pressures and shift points are controlled with different springs and valve sizes in the v-body and governor.

175 psi at max TV is a pressure I think of for a modest HP street application.
Thanks for the info I really didn't know what I was getting into when I got the bright idea to add the new 700R4 behind my new stroked 350! Transmission work is as much an art as it is a science and I really am lost so I appreciate your experience!
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