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Old 01-19-2017, 11:12 AM   #1
aggie91
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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?
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Old 01-19-2017, 11:49 AM   #2
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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.
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Old 01-19-2017, 02:13 PM   #3
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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.
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1965 Chevy Stepside(Grandpa's Old Blue) and (July 2015 Shop Build!)
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

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Old 01-19-2017, 03:24 PM   #4
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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.
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As Iron Sharpens Iron, So One Man Sharpens Another. Proverbs 27:17

FOR SALE: DBW pedal bracket, Pedal adapter for LS trucks! http://67-72chevytrucks.com/vboard/s...d.php?t=651123
FOR SALE: ChubTubz, Rear tubs for slammed trucks! http://67-72chevytrucks.com/vboard/s...d.php?t=675754
FOR SALE: Hood Brackets, Bolt in hood brackets! http://67-72chevytrucks.com/vboard/s...d.php?t=679945


1969 SuperBurb - 5.3/Magnacharger..http://67-72chevytrucks.com/vboard/s...d.php?t=200387
1968 Farm truck: LS3/6L80/TVS1900: http://67-72chevytrucks.com/vboard/s...d.php?t=358692
1968 SWB - SHIFTED: PB Xtreme DM/LS1/Dakota Digital/AccuAir/Vintage Air/...http://67-72chevytrucks.com/vboard/s...d.php?t=551258
1948 5 Window Chevy http://67-72chevytrucks.com/vboard/s...=122164&page=3
FAQ: http://67-72chevytrucks.com/vboard/f...play.php?f=220
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Old 01-23-2017, 11:08 AM   #5
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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.
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Old 01-24-2017, 11:15 AM   #6
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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.
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1965 Chevy Stepside(Grandpa's Old Blue) and (July 2015 Shop Build!)
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
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Old 01-25-2017, 11:54 AM   #7
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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.
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Old 01-25-2017, 12:36 PM   #8
72MARIO
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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 ?
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Old 01-25-2017, 12:48 PM   #9
aggie91
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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.
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1965 Chevy Stepside(Grandpa's Old Blue) and (July 2015 Shop Build!)
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
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