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#1
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727 Trans Questions
I am planning an overhaul on my trans and am planning on going to a manaul valve body, any reccomendations on a clutch/overhaul kit? I was looking through the mopar performance catalog, they have a couple options, street or race. I was also looking for a reccomendation on a torque converter. The car is a 67 coronet 383 big cam, dual exhaust, headers and the gear is at least a 3.73 with a suregrip. Anyone ever used MP trans stuff?
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#2
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http://www.dynamicconverters.com/
Heres a helping link. |
#3
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#4
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Listen to JK. Rumor has it that he invented the Torqueflite, he won't admit it though.......
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#5
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Might take a look at A&A Transmision Too. www.aandatrans.com All mopar. Happy hunting!
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#6
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Thanks for all the sources, do any of you guys run a manual valve body? In another forum on this site people said not to run one on the street. I will mostly me using it as a strret car but will plan on taking it to the track a couple times a year. My trans guy is good, but he does not have that much experience with performance stuff. thanks again you guys are all a big help
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#7
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Manual valve bodies on the street is a controversial subject.
The run-of-the-mill reverse pattern manual valve body doesn't apply the rear band in 1st gear, this places all the load on the sprag which is susceptible to failure without the band applied. Sprag failure can lead to transmission explosion. While the rear band apply feature can be added to many manual VB's, its use on the street has its problems. First, the rear band was never designed to be used on each shift cycle so the wear rate increases; second, shifting to first gear when coming to a stop must be delayed until the car is at a dead stop or the rear band applying will cause an abrupt lunge which is objectionable to most and is hard on parts. |
#8
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does anyone make an automatic valve body that shifts like a manual? by that, i mean as firmly?
there is just something that seems pretty impressive when a manual vb is shifted into 2nd and the tires bark... lol. i think it intimidates the 'vettes and rustangs, too...
__________________
Where are we going?... And why am I in this hand-basket? 84 D250/440/3.54:1 dana 60/16" wheels, 31" tires/A-727trans/3" header mufflers/weighs 5000 lbs/13.22 sec @ 103+ mph. |
#9
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Because the manual VB doesn't use linkage to control the throttle pressure, the line pressure is at maximum all the time; this is why the manual VB shifts so violently, even at light throttle.
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#10
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I have used the TA reverse manual valve body in my sons Dart since I put it together in 1997. I am very aware of what it is and just dont shift back into first untill I am just about at a stop or slow enough that when I do downshift I come on the gas easy to get the load back on the overrunning clutch before I step back on the gas. My son and I have put about 7000 street miles and about 75 1/4 mile passes on it like that and never had any trouble. I also plan to use the same valve body in my 63. Ron
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#11
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727 trans
383-man do you run a bolt in sprag with that trans. just curiuos?
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#12
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Quote:
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#13
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Quote:
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#14
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Carshemi no I dont use a bolt in sprag (overrunning clutch) and I have run full reverse manual valve bodies on the street all my life and never had any trouble. But you do have to understand what you have. Ron
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#15
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727 trans
Thanks figured I'd ask. Planning a full manual reverse later in the project.You build the trans your-self? Do you use a 5.0 apply lever. I know I ask alot of questions?
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#16
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thats great info on the reverse manual valve body I just put one in my 70 cuda, I've been starting out in 2nd around town will this hurt it? It's got 3.91 gears and 24.5 diameter tire. I go to nuetral at stop lights and then to 2nd to start (if there's no audience) Will this help the sprag problem, not shifting down to 1st from 2nd?
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#17
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You can shift back to first after a complete dead stop, but it is still not safe to run these things on the street.
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#18
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There is nothing "unsafe" about running a MVB on the street, you just gotta use your head if it doesn't have rear band apply. Rear band apply is still the safest way to go, but isn't offered by every valve body maker, only the most progressive ones.
A&A reportedly has a MVB with rear band apply that has a delay in the rear band engagement to make it more suitable for street use. The delayed band application allows shifting to 1st before the car comes to a dead stop without the "clunk". |
#19
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That's exactly what I am talking about. Most average persons, and mostly kids, don't know if it has a rear band apply or not. So it is much safer to run a manual/auto for most on the street. What happens if some teen lets a friend drive and forgets to tell him about the no 1st gear down shift and then he slams it from a red light and blows the tranny and takes half the car and or people with it?
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#20
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You have some good points, I put mine in 3 days ago and had no idea this was a problem. You guys saved me a bunch of money. The one thing I have found if anybody puts one in change YOUR SHIFTER TO A REVERSE PATEREN, I know I'll never do this (again) but after years of shifting one way it's easy to go from 2nd to 1st instead of to 3rd, when you really get after it for the first few times. With the RMVB you will no longer have to push the button to down shift,so it will go to first if you screw up. So I'm wondering if the stock slap stick linkage can be modified to a reverse pateren, barring that does anybody know of a shifter that I can use in my 70 cuda with out removing the consule
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#21
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The Hurst V matic should fit as long as you discard it's cover. Stay far away fromteh b&m junk though. They wear out rather quickly. THere was also a pole on here by nz440r/t and Hurst shifters won hands down. The make the best.
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#22
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Quote:
Slamming the throttle down in 1st with a MVB and no rear band applied is exactly the same as doing it with a fully automatic with the shifter in Drive. How many times on any average day do you suppose that's done? Does that make fully automatic valve bodies "dangerous"? |
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