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Author Topic:   Do I need a manual valve body?

Posts: 152
From: Toronto,Ontario,Canada
Registered: Aug 2000

posted 01-17-2001 12:29 PM     Click Here to See the Profile for 70coupe     Edit/Delete Message   Reply w/Quote
What is the minimum vacuum that will keep my C6 automatic working properly?

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Posts: 124
From: Manitoba, Canada
Registered: Nov 2000

posted 01-17-2001 09:55 PM     Click Here to See the Profile for F551   Click Here to Email F551     Edit/Delete Message   Reply w/Quote
Don't know vacuum min - but what happened to us when we started running mid twelves - I would make the shift to third and the trans would shift when it wanted. Can't go rounds like that.

It had a "Trans-go" shift kit, we replaced it with a TCI manual valve body and never looked back! That was the only problem we ever had with the C-6 - ran high tens with it.

My brothers C-4 behind a 351W went about the same way - it had a B&M shift kit, changed to TCI manual as well.

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Mark T 7724

Posts: 51
From: Palmdale, CA
Registered: Nov 2000

posted 01-17-2001 11:29 PM     Click Here to See the Profile for Mark T 7724     Edit/Delete Message   Reply w/Quote
We also encountered the same problem, and we used a "Full Manual Reverse" pattern valve body with a stock shifter.

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Posts: 102
From: Fresno,CA,USA
Registered: May 2000

posted 01-17-2001 11:29 PM     Click Here to See the Profile for camachinist   Click Here to Email camachinist     Edit/Delete Message   Reply w/Quote
Lower vacuum equals higher throttle pressure and higher shift points...when operating in full automatic mode...

I've always run automatic shift kits in my street cars, even the ones I've raced, and have had no difficulties..

In the race car, I run a stock valve body with a generic straight pattern manual shift kit...and retain the vacuum modulator.

The same trans and valve body have been running anywhere from 12.00's to 11.20's over the last 20 years with no complaints...
With the W in the car now, it'll bark the slicks on the 1-2 if they haven't VHT'd the track well...

I've experienced no shifting problems other than driver error..*G*


64.5 D-code coupe
65 A-code FB drag car

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capri man

Posts: 1267
From: doerun, ga.
Registered: Nov 2000

posted 01-18-2001 07:42 PM     Click Here to See the Profile for capri man   Click Here to Email capri man     Edit/Delete Message   Reply w/Quote
been running mvb for two years now with no problems. the reason i got it to start with was the transmission is supposed to last longer.
thanks----mike r-------capri man

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Posts: 11493
From: Lyons, IL, USA
Registered: May 99

posted 01-23-2001 09:58 PM     Click Here to See the Profile for Moneymaker   Click Here to Email Moneymaker     Edit/Delete Message   Reply w/Quote
JPT full manual valve body. 1-517-663-0578 or [email protected]

Alex Denysenko Co-Administrator and Moderator NHRA/IHRA/SRA member
Fleet of FoMoCo products
Moneymaker Bio
US Class Nationals link

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