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#1 |
Registered User
Join Date: Oct 2009
Location: Gardnerville Nv No Mo Cali!!
Posts: 869
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Transmission switch?
I tried posting this in the engine section but didn't really get my question answered. I guess my question really is...Does a TH350 have a switch on it?
71 C-10 350/350 I'm in the process of reinstalling my engine and transmission. I have a 16 gauge black wire that comes from a relay on my firewall. The diagram shows it going to a transmission control switch. The transmission is a TH350 and I can't see a switch anywhere on it. Does anyone know where this wire connects to? Thanks! |
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#2 |
Registered User
Join Date: May 2009
Location: florence arizona
Posts: 53
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Re: Transmission switch?
if i remember right ,, a th 350 has a vacuum modulator ,, not a trans control switch .. 71 was not computer controlled .. th 400 was electric kick down ..
Last edited by bobjob; 12-12-2010 at 12:51 PM. |
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#3 |
Parts and more parts
Join Date: Nov 2003
Location: Lebo, Kansas (middle of nowhere
Posts: 6,821
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Re: Transmission switch?
There is no transmission switch on the TH350 tranny. There is a vacuum tube that runs down to the modulator on the passenger side of the tranny and that is all.
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Frank Last edited by piecesparts; 12-12-2010 at 12:52 PM. |
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#4 |
laying low
![]() Join Date: Mar 2001
Location: Searcy, Ark. USA
Posts: 13,275
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Re: Transmission switch?
Wasn't there a spark control solenoid hooked to the trans for emissions in 72?
Sarge and I were both on it. ![]()
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Boog 69 Chevy stepside, 358/T350, 4.11 posi, 4.5/4 drop, rallys, poboy driver primer is finer 91 Chevy sportside, Tahoe, Yukon & GMC Crewcab All GM..'nuff said. I stand for the flag and kneel at the cross Last edited by Boog; 12-12-2010 at 04:36 PM. |
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#5 |
Msgt USAF Ret
![]() ![]() Join Date: Jan 2005
Location: Kalamazoo, Michigan
Posts: 8,714
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Re: Transmission switch?
If the transmission is not stock it might be a th350C with the lock-up converter.I think they came out in 1980. The wire for the lockup comes from the fire wall relay an is vacuum controlled.
There was also a transmission controlled spark emissions system on the 71 models that had vacuum controlled relays and wiring to the transmission to control the vacuum advance on the distributor.
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VetteVet metallic green 67 stepside 74 corvette convertible 1965 Harley sportster 1995 Harley wide glide Growing old is hell, but it beats the alternative. |
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#6 |
its all about the +6 inches
Join Date: Jan 2001
Location: Hilliard Ohio
Posts: 2,693
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Re: Transmission switch?
I *think* the TCS came out in 70... but yeah, the relays and wires were stock, it went to a switch that was on the side of the trans (both TH350 & 400). Odds are it started leaking and was removed with a pipe plug put in its place.
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#7 |
Registered User
Join Date: Feb 2008
Location: sacramento california
Posts: 204
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Re: Transmission switch?
On my 70 Th350 I took out yesterday there is a two prong electrical connector what does that do?
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#8 |
its all about the +6 inches
Join Date: Jan 2001
Location: Hilliard Ohio
Posts: 2,693
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Re: Transmission switch?
TCS, Transmision Controled Spark.
An early poorly designed emissions control piece. There was a temperature sensor in the passenger side head, and a switch in the tranny. The system would require the engine to be up to operating temperature, and the trany in top gear before it would allow vac advance to the dist.. It resulted in poor performance and reduced MPG. Most have been removed many many year ago |
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#9 | |
Registered User
Join Date: Oct 2009
Location: Gardnerville Nv No Mo Cali!!
Posts: 869
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Re: Transmission switch?
Quote:
Thanks for the replies. So, I have a wire from the relay that's supposed to go to the non existent switch on the transmission. I suppose I should just cut the wire and forget about it?? |
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#10 |
its all about the +6 inches
Join Date: Jan 2001
Location: Hilliard Ohio
Posts: 2,693
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Re: Transmission switch?
thats what I did, all that crap hit the shop floor pretty soon after buying it.
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