The 1947 - Present Chevrolet & GMC Truck Message Board Network







Register or Log In To remove these advertisements.

Go Back   The 1947 - Present Chevrolet & GMC Truck Message Board Network > 47 - Current classic GM Trucks > The 1967 - 1972 Chevrolet & GMC Pickups Message Board

Web 67-72chevytrucks.com


Reply
 
Thread Tools Display Modes
Old 04-12-2014, 05:22 PM   #1
o6r1man
Registered User
 
o6r1man's Avatar
 
Join Date: Aug 2008
Location: KS
Posts: 268
Th350 shifting early

The turbo 350 in my 70 is shifting way to early. It makes the 1-2 shift around 3,300 rpm and the 2-3 shift happens 3,900 and I was just wondering what ya'll thought it would be? Thanks in advance!!
__________________
1970 SWB "old flame"
1967 SWB c10 sold
1972 Elcamino 496
2012 Denali HD dmax
o6r1man is offline   Reply With Quote
Old 04-12-2014, 07:00 PM   #2
myyamr7
Registered User
 
myyamr7's Avatar
 
Join Date: Dec 2012
Location: Providence, RI
Posts: 211
Re: Th350 shifting early

Is the detent/kickdown cable hooked up?

I don't remember if the modulator was for shift points, or shift firmness, but some are adjustable. I thought the detent was for high rpm shift points, and the modulator controlled the low shift points/firmness in drive
__________________
Mark
71 C10 Cheyenne
12 Aprilia RSV4
myyamr7 is offline   Reply With Quote
Old 04-12-2014, 07:01 PM   #3
kaycee
Registered User
 
kaycee's Avatar
 
Join Date: Jan 2000
Location: Wyoming USA
Posts: 2,445
Re: Th350 shifting early

You might go down south in the performance section and ask ,have you done anything to it or did it just start doing it.Could be the govenor,could be in the valve body , could be clutchs need a little bit more info.
__________________
2001 Silverado K-1500
2005 FXDWG stage3
69 CHEVY Short/Step 327/4L60 373 posi
63 IMPALA 327
kaycee is offline   Reply With Quote
Old 04-12-2014, 10:51 PM   #4
o6r1man
Registered User
 
o6r1man's Avatar
 
Join Date: Aug 2008
Location: KS
Posts: 268
Re: Th350 shifting early

I bought the truck back about a year ago and it was doing it then. The kick cable is hooked up and working. The teams isn't slipping so I wouldn't think it was clutches. I can shift it manually and it will stay in that gear until I up shift..
__________________
1970 SWB "old flame"
1967 SWB c10 sold
1972 Elcamino 496
2012 Denali HD dmax
o6r1man is offline   Reply With Quote
Old 04-12-2014, 10:56 PM   #5
litew8
Registered User
 
litew8's Avatar
 
Join Date: Jul 2011
Location: Des Moines, Iowa
Posts: 3,016
Re: Th350 shifting early

x2 for the modulator. I'd check/replace it to start with.

__________________
project: "my happy mess"
litew8 is offline   Reply With Quote
Old 04-13-2014, 10:24 AM   #6
o6r1man
Registered User
 
o6r1man's Avatar
 
Join Date: Aug 2008
Location: KS
Posts: 268
Re: Th350 shifting early

Quote:
Originally Posted by litew8 View Post
x2 for the modulator. I'd check/replace it to start with.

I did that yesterday after posting and it didn't make a difference...
__________________
1970 SWB "old flame"
1967 SWB c10 sold
1972 Elcamino 496
2012 Denali HD dmax
o6r1man is offline   Reply With Quote
Old 04-13-2014, 11:42 AM   #7
myyamr7
Registered User
 
myyamr7's Avatar
 
Join Date: Dec 2012
Location: Providence, RI
Posts: 211
Re: Th350 shifting early

Quote:
Originally Posted by o6r1man View Post
I did that yesterday after posting and it didn't make a difference...
Where the vacuum line goes in, there should be a screw head in the port. it's adjustable, so try some trial and error
__________________
Mark
71 C10 Cheyenne
12 Aprilia RSV4
myyamr7 is offline   Reply With Quote
Old 04-13-2014, 05:53 PM   #8
turp mcspray
Registered User
 
turp mcspray's Avatar
 
Join Date: May 2007
Location: Rapid City South Dakota
Posts: 2,359
Re: Th350 shifting early

I would try adjusting the kick down cable. It is simple, free, and does change when it shifts.
__________________
Turp Mcspray
New life for an old 2wd, farm blazer
http://67-72chevytrucks.com/vboard/s...d.php?t=505987
My Blazer build http://67-72chevytrucks.com/vboard/s...d.php?t=342299
turp mcspray is offline   Reply With Quote
Reply

Bookmarks


Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off

Forum Jump


All times are GMT -4. The time now is 06:02 AM.


Powered by vBulletin® Version 3.8.11
Copyright ©2000 - 2024, vBulletin Solutions Inc.
Copyright 1997-2022 67-72chevytrucks.com