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Old 04-07-2003, 11:22 AM
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Post fitting a blower to 359 chevy with 700r4 tranny

what do you have to do with the tv cable adjustment if you fit a small blower ie weiand 142
on to a 350 motor.I am told that the tv cable adjusts oil pressure as its moved to wot.obviously there would be horse power with a blower.any help information would be appreciated <img src="confused.gif" border="0">

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Old 05-23-2006, 09:48 PM
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just make it so the tv cable is fully extended at full throttle and then drive it you can always adjust it a few notches to make it shift when you want it to...... oh yea the 700 is not going to hold the horsepower
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Old 05-24-2006, 05:27 PM
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I have a '33 Ford with a blown SB Chevy and a TH700 trans. I have tried everything under the sun to get it to shift properly and frankly, I don't think it is possible with a cable controlled setup. I can adjust it so it shifts fine at normal driving (part throttle shifts) but then if I nail it, the transmission slips badly at full throttle shifts.

I have fabricated all different types of linkage to try to provide a different ratio on the pull on the cable and nothing works. The car has a B&M blower and a B&M trans and was taken to B&M and they played around with it for a few days and fabricated an adjustable bell crank with a lot of different geometry possibilities and eventually gave up and said it couldn't be done.

I also have a '32 roadster with essentially the same engine and blower but a TH400 trans and using the vacuum system the trans shifts perfectly at either part throttle or full throttle.

The former chief engineer for B&M designed a vacuum system that was intended to be retrofitted to the TH700 but B&M never built it because they didn't think there was enough demand for it. He gave me a set of the drawings in case I wanted to have the parts made myself but it just seemed like it was going to be a really big deal so I never did it.

If I had it all to do over again, I would put a TH400 with a Gear Vendors overdrive in the '33. Unfortunately, I can't do it now because the chassis was designed and built around the TH700. I would have to pull the body off and totally rework the chassis to make the change. Too much work.

Also, if you follow the advice given above about adjusting the cable so it is fully extended at full throttle, your part throttle shifts will be so hard, it will jolt the heck out of you and the car.
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Old 05-24-2006, 07:34 PM
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yea you have the tv cable adjusted you just have way to much horsepower for a 700 ...i have a naturally aspirated 350 w/ 400 hp and my 700 slips like a mf'er under full throttle.im about to put a th350 in
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Old 05-24-2006, 09:37 PM
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Quote:
Originally Posted by 85vette
yea you have the tv cable adjusted you just have way to much horsepower for a 700 ...i have a naturally aspirated 350 w/ 400 hp and my 700 slips like a mf'er under full throttle.im about to put a th350 in
That all depends on who built it and how its built. There are plenty people out there running engines with 500+ horsepower and their 700's work fine.

You want to adjust the TV cable for proper shift firmness and line pressure. It does NOT control the shift points and anyone who messes with it to try and alter their shifting points is asking for trouble. It might seems like its chaning things but this is only because proper line pressure isn't reached. You need to set the TV cable per spec (the proper way using a pressure guage on the the test port of the tranny) and then change other components to affect shift points (having to do with the governer I believe).

I dont have experience with a blower and the TV cable setup but I am having a hard time seeing how it would be any different. As long as your throttle blade to cable movement geometry remains the same and its hitting full TV pull at WOT you should be fine.
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Old 05-24-2006, 09:58 PM
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Depending on the linkage angle you will get different part throttle settings. I will explain. The angle must be "exactly" the factory angle or it will not be correct. You can do it without the factory linkage by tunning for full throttle only (do this regardless of linkage or carb). Hit the detent tab rachet it back as far as it will go, get in side the car and give it one full WOT hit (all the way to the floor). It will be adjusted at this point. Your part throttle shifts might be a little higher that normal, but guess what it will live longer this way, you will have slighly higher fluid pressure at part throttle (where it is at most of the time), and full pressure at full throttle which is what you want regardless of how you are set up. If you tune for shift feel at part throttle to get it where you want is when you will definately run into trouble. You can actually change the angle by adding tabs to the carb linkage and change your throttle angle, but still tune for wot adjustment ONLY. It is also true that you might be slipping due to having to much power for your current transmission setup as well. Sooooo. Good Luck!!
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Old 05-25-2006, 08:37 AM
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Don't burn your tranny, do it the correct way.
http://www.tvmadeez.com/
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