shifting th 350 without vacuum - The 1947 - Present Chevrolet & GMC Truck Message Board Network

vtwinsport · 11-22-2009, 10:55 AM

Morning,
How many of you out there shift your tH350s without vacuum using a ratchet type cable shifter? If so, as a daily driver is it too much shifting?
Just wondering as I've read these shifter are great for strip, occassional hoolaginism on the street
Second question; how low can the vacuum go before the th350 won't shift without it?
thanks in advance

ont_guy_38 · 11-22-2009, 05:14 PM

Are you thinking of a manual valve body?Anyways once you get used to how they work it,s not that hard,there isn,t a clutch to deal with just push the shifter ahead and thats it

cableguy0 · 11-22-2009, 05:24 PM

the shifter has nothing to do with how the tranny operates. in order to remove the modulator and shift manually all the time you need to change to a manual valve body. not the best idea on a street vehicle. unless your racing all the time theres no need for anymore than a good shift kit which will allow you to have full control manually shifting but also will shift on its own when you put it in drive.

vtwinsport · 11-22-2009, 06:36 PM

Thats what I as wondering. I am so new when it comes to transmissions I wasn't sure what to ask.
At what point is the vacuum too low to work properly? I'm thinking I'll change my heads to 180cc with the comp cam 268 I already have and wondered how that might affect the th 350 and my power brakes.

cableguy0 · 11-22-2009, 06:43 PM

it will be fine. if you have an issue with the shift points due to vaccum just change to an adjustable modulator. in the grand scheme of things that cam is a baby and you will be fine. the cam will dictate the vac made changing the heads shouldnt really have any noticeable effect on vac. if your brakes are working ok now they should be fine. worse case you can get a vacuum reserve can for about 50 bucks and it will be fine.

vtwinsport · 11-22-2009, 07:24 PM

cableguy0
thx.

11-22-2009, 10:55 AM	#1
vtwinsport Registered User Join Date: Nov 2008 Location: edmonton, alberta Posts: 293	shifting th 350 without vacuum Morning, How many of you out there shift your tH350s without vacuum using a ratchet type cable shifter? If so, as a daily driver is it too much shifting? Just wondering as I've read these shifter are great for strip, occassional hoolaginism on the street Second question; how low can the vacuum go before the th350 won't shift without it? thanks in advance __________________ 76 Silverado, 2wd, long box, 350/th350, 3.42 posi, edelbrock performer 64cc heads, edelbrock 1405, 2101 intake, Hedman Headers, Comp Cam XE262 http://beerbreadbike.wordpress.com/

11-22-2009, 05:14 PM	#2
ont_guy_38 Registered User Join Date: Jul 2007 Location: Ontario Canada Posts: 1,006	Re: shifting th 350 without vacuum Are you thinking of a manual valve body?Anyways once you get used to how they work it,s not that hard,there isn,t a clutch to deal with just push the shifter ahead and thats it

11-22-2009, 05:24 PM	#3
cableguy0 Senior Member Join Date: Apr 2000 Location: Delta,Pa Posts: 14,948	Re: shifting th 350 without vacuum the shifter has nothing to do with how the tranny operates. in order to remove the modulator and shift manually all the time you need to change to a manual valve body. not the best idea on a street vehicle. unless your racing all the time theres no need for anymore than a good shift kit which will allow you to have full control manually shifting but also will shift on its own when you put it in drive. __________________ Owner of North Point Car Care in Dundalk Md. We specialize in custom exhaust on both modern and classic vehicles. We are a full service auto shop from classics to modern vehicles. Feel free to contact me with questions. I will give a 10% discount to any board member.

11-22-2009, 06:36 PM	#4
vtwinsport Registered User Join Date: Nov 2008 Location: edmonton, alberta Posts: 293	Re: shifting th 350 without vacuum Thats what I as wondering. I am so new when it comes to transmissions I wasn't sure what to ask. At what point is the vacuum too low to work properly? I'm thinking I'll change my heads to 180cc with the comp cam 268 I already have and wondered how that might affect the th 350 and my power brakes. __________________ 76 Silverado, 2wd, long box, 350/th350, 3.42 posi, edelbrock performer 64cc heads, edelbrock 1405, 2101 intake, Hedman Headers, Comp Cam XE262 http://beerbreadbike.wordpress.com/ Last edited by vtwinsport; 11-22-2009 at 06:37 PM.

11-22-2009, 06:43 PM	#5
cableguy0 Senior Member Join Date: Apr 2000 Location: Delta,Pa Posts: 14,948	Re: shifting th 350 without vacuum it will be fine. if you have an issue with the shift points due to vaccum just change to an adjustable modulator. in the grand scheme of things that cam is a baby and you will be fine. the cam will dictate the vac made changing the heads shouldnt really have any noticeable effect on vac. if your brakes are working ok now they should be fine. worse case you can get a vacuum reserve can for about 50 bucks and it will be fine. __________________ Owner of North Point Car Care in Dundalk Md. We specialize in custom exhaust on both modern and classic vehicles. We are a full service auto shop from classics to modern vehicles. Feel free to contact me with questions. I will give a 10% discount to any board member.

11-22-2009, 07:24 PM	#6
vtwinsport Registered User Join Date: Nov 2008 Location: edmonton, alberta Posts: 293	Re: shifting th 350 without vacuum cableguy0 thx. __________________ 76 Silverado, 2wd, long box, 350/th350, 3.42 posi, edelbrock performer 64cc heads, edelbrock 1405, 2101 intake, Hedman Headers, Comp Cam XE262 http://beerbreadbike.wordpress.com/



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