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post #1 of (permalink) Old 12-28-1999, 03:59 PM
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manual/reverse pattern valve body Q\'s

I am still deciding what transmission to put inmy jeep. I have a th350/np203 and a th400/np205, but this tranny is qa neal chance racing transmission and is bullet proof and has a reverse throttle body. I was told that this has no "drive" that is automatically shifting gear. Does this mean I just shift it like a manual, but with no clutch? I really want to use this set up with a stock convertor. I have successfully rebuilt my th350 and understand how the valve body works...but am unsure of this reverse shift pattern thing...what advantages does it have... will the tranny have the same life expectancy if it is shifted manually?


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post #2 of (permalink) Old 12-28-1999, 04:19 PM
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Re: manual/reverse pattern valve body Q\'s

Doesn't the "reverse" shift pattern mean that you leave the neutral gate into 1st .......2nd......and 3rd? That is, you can't accidentally overshoot the neutral gate into in a racing situation? If it's what I seem to remember something kinda sorta about that is. I would imagine your life expectancy would be ideally higher .....if you were the perfect'ld avoid the "soft" engagment of the traditional american trans for the more abrupt "euro" style immediate shift....hence less incidental wear. I believe you lose the use of the sprag .......or is it a roller clutch (I think it's a roller in the 350 ....sprag in the 400).....anyway in the manual shift mode you'll have no "free wheeling" effect that a normally equipped auto has (you know ...when your in Drive and you hit 2nd gear and let off the gas and have NO engine braking effect ....but you do when the shifter is in the 2nd gear position).
I imagine it would be a PITA until you got used to it.........but it would still be less of a PITA than a 5-speed.


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post #3 of (permalink) Old 12-28-1999, 04:55 PM
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Re: manual/reverse pattern valve body Q\'s

In a reverse manual valve body you shift toward console N--1--2--3. It shifts just as you would a manual tranny except with no clutch. You will also have no passing gear as you will have to manually shift down if neccesary to pass. It also means every time you stop you will have to go back to 1st and start over. It will also shift very hard as most setups like that are used in muscle cars or race cars. Its good for a tranny to shift quick, but that setup may be a little much for street or trail in a jeep, not that it is bad on the tranny, but you might get pretty tired of constantly shifting up and down through the gears. No different than a manual tranny you might think but you at least have the ability to push the clutch in to disengage the engine with a manual. My opinion, leave the racing trannys with the reverse manual valve bodies for the street and strip cars unless you want to hear it bark the tires when you shift.. Steve

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post #4 of (permalink) Old 12-28-1999, 04:57 PM
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Re: manual/reverse pattern valve body Q\'s

<font color=purple> You'd have to work that sucker just like a manual & "reverse pattern" does mean just that - 1st is where 3rd would be & vise versa, second still in the middle. You put it in 3rd & it's in 3rd, just like a stick. You'll want a quality ratchet shifter if you decide on that drivetrain setup, and there's absolutely no reason you couldn't use a totally stock converter. Gearing differences are minimal (2.52, 1.52, & 1.00 for the TH350 - 2.48, 1.48, & 1.00 for the TH400), and both tranny's are extremely durable. Each has a couple of minor weaknesses, but neither would be problematic under normal circumstances. The main question here is whether you want a bulletproof 205, or the AWD possibility of the 203. </font color=purple>


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