Since full manual valvebodies in automatic transmissions are primarily used for the dragstrip, and there isn't any need to downshift during a drag race, would there be any problem on the street with downshifting during full throttle using an aftermarket ratchet shifter????

No, no problem under acceleration.

No, no problem under acceleration.Thankyou Jake. I appreciate it.

why would you want to downshift under full throttle.

why would you want to downshift under full throttle. Haven't you ever gotten into a race on the street from a 70 MPH roll? It isn't something that I do every day, since there has to be close to no traffic at all, as well as a nice big wide and open straight away in front of me in order for me to engage in such a practice. but if I'm cruising at 70 MPH, and someone challenges me in an area where those conditions are in place to minimize the risk, then I'm gonna hammer the go pedal. And at 70 MPH in 3rd gear with a TH400 transmission, 3.73 gears in the rear, and a 30" tall tire, I'm only reving the engine at about 2,900 RPM.

So downshifting to second gear in while hitting full throttle would be the thing to do, since the engine will be reving at about 3800-3900 RPM when it hits second gear. Again, this concerns street driving, not bracker racing, and it isn't something that would occur daily. But I would want traffic conditions or the area in question to dictate whether or not I would do this, and not the transmission features. And aside from street racing, even if there isn't any racing at all, the fact is that street driving will require downshifts during acceleration anyway. transmissions with fully automatic valvebodies downshift just about every time you hit the go pedal.

I think with a 632 and enough horsepower at 70 it would break the tires loose and turn left. That is definitely something that you don't want. Go from a stop or slow roll only.

I think with a 632 and enough horsepower at 70 it would break the tires loose and turn left. That is definitely something that you don't want. Go from a stop or slow roll only.Yes I understand that, and I appreciate the warning my friend. Believe me, this won't be the first fast car I'll be driving on the street, however I will admit that it will be the first with this power level, and I fully intend to have great respect for that abundance of power.

Even though full throttle might not be useable in the potential scenario that I've described in my last post, there will be part throttle moves like that once in awhile as long as there's nothing in front of me. And I just wanted to make sure before I purchase a transmission with a full manual VB that it wouldn't be the limitations of the transmission that will make my decision for me concerning my driving habits, but instead it would be good sense that would dictate those things. Thanks for your reply. It's appreciated. :thumbsup:

I would check into that. I think, I could be wrong, but I think you might be better dropping rpm in gear to about 1000, downshift and then jump on it.

I would check into that. I think, I could be wrong, but I think you might be better dropping rpm in gear to about 1000, downshift and then jump on it. Well, just as you've implied in one of your previous posts, this engine I have might have enough power to not ever require me to downshift at all during acceleration, but that remains to be seen.

I just wrote to a transmission place, and they told me that their TH400's with full manuals can be downshifted during hard acceleration. I would've written to them in the first place, but I often place more trust in guys with hands on experience who are customers of these aftermarket places rather than the tech guys and sales guys.

Yea ive been cruising in my nova at like 40mph in 3rd gear, and i'll jump on it and downshift at the same time. You want to be into the throttle when you do this tho, waiting to give it gas after you downshift would prolly not be doing the tranny much good...

Yea ive been cruising in my nova at like 40mph in 3rd gear, and i'll jump on it and downshift at the same time. You want to be into the throttle when you do this tho, waiting to give it gas after you downshift would prolly not be doing the tranny much good...Exactly. Not to mention that if you drop into a lower gear that has engine braking, it's going to slow you down initially, unless you're already on the gas before you downshift.