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 > General Truck Forums > Engine & Drivetrain > LSx Swaps

Web 67-72chevytrucks.com


Reply
 
Thread Tools Display Modes
Old 01-19-2017, 11:12 AM   #1
aggie91
I'm just glad to be here!
 
aggie91's Avatar
 
Join Date: Jan 2008
Location: Longview, TX
Posts: 4,788
VSS with a TH350...

OK, I am putting in a LM7 into my truck, but I am using a TH350 for the trans since I had one sitting ready to go.

I have heard that I need to have a VSS signal that goes to the PCM to help avoid stalling the engine under hard breaking conditions. Since the TH350 has no provision for a VSS sensor, HOW DO I get that signal to the PCM?

OR - Do I really NEED that signal to the PCM?
__________________
Karl



1965 Chevy Stepside(Grandpa's Old Blue) and (July 2015 Shop Build!)(2020, the Saga Continues)
http://67-72chevytrucks.com/vboard/s...d.php?t=372424

The LST Challenge:
http://67-72chevytrucks.com/vboard/s...=1#post7812257

Korbin's 1st Square: "Sunburn"
http://67-72chevytrucks.com/vboard/s...d.php?t=418618

1985 GMC Sierra: "White Trash", Korbin's 2nd now...
http://67-72chevytrucks.com/vboard/s...d.php?t=632305

Henry - 1984 Chevrolet, Owen's 1st Square
aggie91 is offline   Reply With Quote
Old 01-19-2017, 11:49 AM   #2
Hart_Rod
*************
 
Hart_Rod's Avatar
 
Join Date: Apr 2005
Location: Pensacola, FL
Posts: 17,822
Re: VSS with a TH350...

Quote:
Originally Posted by aggie91 View Post
OK, I am putting in a LM7 into my truck, but I am using a TH350 for the trans since I had one sitting ready to go.

I have heard that I need to have a VSS signal that goes to the PCM to help avoid stalling the engine under hard breaking conditions. Since the TH350 has no provision for a VSS sensor, HOW DO I get that signal to the PCM?

OR - Do I really NEED that signal to the PCM?
Yes you need one. You can use this: http://67-72chevytrucks.com/vboard/s...d.php?t=696560

Let me know.
Hart_Rod is offline   Reply With Quote
Old 01-19-2017, 02:13 PM   #3
aggie91
I'm just glad to be here!
 
aggie91's Avatar
 
Join Date: Jan 2008
Location: Longview, TX
Posts: 4,788
Re: VSS with a TH350...

Thanks Rob. I really wanted to run the stock mechanical speedo too. Let me looking that and I will get back to you. Your part looks like a good deal if I skip the stock speedo.
__________________
Karl



1965 Chevy Stepside(Grandpa's Old Blue) and (July 2015 Shop Build!)(2020, the Saga Continues)
http://67-72chevytrucks.com/vboard/s...d.php?t=372424

The LST Challenge:
http://67-72chevytrucks.com/vboard/s...=1#post7812257

Korbin's 1st Square: "Sunburn"
http://67-72chevytrucks.com/vboard/s...d.php?t=418618

1985 GMC Sierra: "White Trash", Korbin's 2nd now...
http://67-72chevytrucks.com/vboard/s...d.php?t=632305

Henry - 1984 Chevrolet, Owen's 1st Square
aggie91 is offline   Reply With Quote
Old 01-19-2017, 03:24 PM   #4
Hart_Rod
*************
 
Hart_Rod's Avatar
 
Join Date: Apr 2005
Location: Pensacola, FL
Posts: 17,822
Re: VSS with a TH350...

Quote:
Originally Posted by aggie91 View Post
Thanks Rob. I really wanted to run the stock mechanical speedo too. Let me looking that and I will get back to you. Your part looks like a good deal if I skip the stock speedo.
No worries. LMK.
Hart_Rod is offline   Reply With Quote
Old 01-23-2017, 11:08 AM   #5
TooTall
Registered User
 
Join Date: Mar 2009
Location: League City,TX
Posts: 66
Re: VSS with a TH350...

I'm running mine without the VSS on a TH350. I turned off engine braking in the tune, so no worries with it.
__________________
1973 K5, full vert, 6" BDS lift, 35 Mickey T MTs
1984 K10, 8" lift on 35s
2004 3/4 4wd, 33s Toyo Mts, Long Tube headers, 3K multidisk 80e, tons of miles
2011 Yukon XL | Bone stock
2013 Audi Q5
TooTall is offline   Reply With Quote
Old 01-24-2017, 11:15 AM   #6
aggie91
I'm just glad to be here!
 
aggie91's Avatar
 
Join Date: Jan 2008
Location: Longview, TX
Posts: 4,788
Re: VSS with a TH350...

Thanks for the input. I have heard that I can do that, but just not sure what I want to do just yet.

Look like Dakota Digital has a 8k per mile pulse generator that is a pass thru that will let me keep my stock speedo. Seems to be cost effective at under $50.
__________________
Karl



1965 Chevy Stepside(Grandpa's Old Blue) and (July 2015 Shop Build!)(2020, the Saga Continues)
http://67-72chevytrucks.com/vboard/s...d.php?t=372424

The LST Challenge:
http://67-72chevytrucks.com/vboard/s...=1#post7812257

Korbin's 1st Square: "Sunburn"
http://67-72chevytrucks.com/vboard/s...d.php?t=418618

1985 GMC Sierra: "White Trash", Korbin's 2nd now...
http://67-72chevytrucks.com/vboard/s...d.php?t=632305

Henry - 1984 Chevrolet, Owen's 1st Square
aggie91 is offline   Reply With Quote
Old 01-25-2017, 11:54 AM   #7
MalibuSSwagon
Registered User
 
Join Date: Sep 2009
Location: Weare,NH
Posts: 1,589
Re: VSS with a TH350...

jagsthatrun has this kit, pricey tho for what it is.

http://www.jagsthatrun.com/Pages/Par...ctor-Diff.html

I believe the 8k pulse pass thru sender works as well. I am actually not running a VSS at this time, I don't have stalling issues but decel is not as smooth has it could be. But I am running an SM465 manual, not sure how well that will work with an automatic.
MalibuSSwagon is offline   Reply With Quote
Old 01-25-2017, 12:36 PM   #8
72MARIO
Registered User
 
72MARIO's Avatar
 
Join Date: Nov 2000
Location: Huntsville Ontario Canada
Posts: 4,052
Re: VSS with a TH350...

I think that in the tune you can adjust the tune to accept 8000k . That dakota digital piece should work for you.

Who is programing your pcm ?
__________________
1968 Suburban numbers matching all original truck now equipped with 6.0/4L80 on Accuair
http://67-72chevytrucks.com/vboard/s...d.php?t=625017
1967 C/20 6.0/4L80 Roofing Truck
1990 V2500 Suburban "Plow Truck"
2005 TAHOE DD
72MARIO is offline   Reply With Quote
Old 01-25-2017, 12:48 PM   #9
aggie91
I'm just glad to be here!
 
aggie91's Avatar
 
Join Date: Jan 2008
Location: Longview, TX
Posts: 4,788
Re: VSS with a TH350...

I have spoken to the tuner, he can program the VSS to accept the 8k pulse signal. For this swap I am just going to have Brent at lt1swap.com do the vats delete and turn the codes off for the trans when I get it done.
__________________
Karl



1965 Chevy Stepside(Grandpa's Old Blue) and (July 2015 Shop Build!)(2020, the Saga Continues)
http://67-72chevytrucks.com/vboard/s...d.php?t=372424

The LST Challenge:
http://67-72chevytrucks.com/vboard/s...=1#post7812257

Korbin's 1st Square: "Sunburn"
http://67-72chevytrucks.com/vboard/s...d.php?t=418618

1985 GMC Sierra: "White Trash", Korbin's 2nd now...
http://67-72chevytrucks.com/vboard/s...d.php?t=632305

Henry - 1984 Chevrolet, Owen's 1st Square
aggie91 is offline   Reply With Quote
Reply

Bookmarks

Tags
lm7, th350, vss

Thread Tools
Display Modes

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 PM.


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