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-   -   350TH question????? (http://www.hotrodders.com/forum/350th-question-100545.html)

rbomar 10-18-2006 08:55 AM

350TH question?????
 
I have plugged the vacuum hose going to my modulater on my 350TH in my drag only car and must shift it manually. My question is, when I stop the car and put the trans in 3rd gear, manually, then drive off slowly, the car seems like it is still in 1st gear, ie- high revs going slow. I thought it would be very sluggish since it was in 3rd gear. I can stop the car, put trans in 1st, drive off slowly and shift it to 2nd then to 3rd, then stop again. Leaving the trans in 3rd, when I start off, it still seems like it is in 1st gear. What do ya'll think ? Is this right?

poncho62 10-18-2006 09:08 AM

The modulator only determines the shift points. To make it totally manual, you need to modify or replace the valve body. You are not gaining a thing by plugging up the vacuum line.....just making it more difficult to drive.

Jmark 10-18-2006 09:16 AM

Quote:

Originally Posted by poncho62
The modulator only determines the shift points. To make it totally manual, you need to modify or replace the valve body. You are not gaining a thing by plugging up the vacuum line.....just making it more difficult to drive.

Yep,,,,what Poncho said!!

Mark

astroracer 10-18-2006 09:24 AM

Here is what TCI has to say about vacuum modulators...
http://www.tciauto.com/Products/Comp...modulators.asp
Like Poncho said, you need a few more mods to make your trans fully "manual". I hope you haven't hurt it by plugging the vacuum modulator...
Putting the shifter in 3rd gear, while sitting still, will do nothing. The trans only sees line pressure when the vehicle is moving. The line pressure needs to be at a certain point before the trans will up-shift to 2nd or 3rd. This is why it starts out in first and then up-shifts to 2nd. The trans will automatically downshift as you slow down so it is always in "first gear" when you start rolling.
Mark


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