Cruise control

[diesel_lv]

1987 K5 Blazer, vacuum type cruise control. I've got a junked '89 1 ton truck w the electric style cruise. Haven't pulled it out yet but was wondering if it will work on my '87. The electrical connectors look the same. Thanks.

 

[AuroraGirl]

1987 K5 Blazer, vacuum type cruise control. I've got a junked '89 1 ton truck w the electric style cruise. Haven't pulled it out yet but was wondering if it will work on my '87. The electrical connectors look the same. Thanks.

Swapping cruise systems is a weird thing with the old GM systems... I think its most dependant on if everything follows everything like you need all the parts and stuff. not sure if your switch will work with it tho. is your switch on the stalk for turn or is it separatate or... i guess pics of your stuff now?

also. 89 truck has ELECTRIC? Thats weird. If so thats not bad just blows my mind. the cars usually got that stuff first. my 1990 olds has vacuum system yet even.

 

[diesel_lv]

Thanks for the reply. I finally got to look at the connectors on both. My '87 has a 5 pin inline connector and the '89 has a double row of 5 making 10 slots using 7 of them. So there are at least 2 pins missing on mine that the '89 would require. The '89 even has electric speedo output on the TH400. It was a Camper Special that I pulled the 454. TH400 and factory installed Gearvendor out of. All functioning. Got it for $500. Now I'm just scrapping whatever I can off of it.

 

[AuroraGirl]

Thanks for the reply. I finally got to look at the connectors on both. My '87 has a 5 pin inline connector and the '89 has a double row of 5 making 10 slots using 7 of them. So there are at least 2 pins missing on mine that the '89 would require. The '89 even has electric speedo output on the TH400. It was a Camper Special that I pulled the 454. TH400 and factory installed Gearvendor out of. All functioning. Got it for $500. Now I'm just scrapping whatever I can off of it.

that electric speedo and the th400 both add some mystery to what i would comfortably say so hmm. Does your column switch have the button and the slider that has 3 spots?

 

[diesel_lv]

Exact same type of turn signal speedo stalk. 3 position slider w push button on end.

 

[AuroraGirl]

Exact same type of turn signal speedo stalk. 3 position slider w push button on end.

Hmm. are you sure its electronic. gm used that stalk with vacuum cruise for many years, more than the electronics was around actually. the old vacuum speedo cable type is different than the vacuum type they had before they made the electronic one. The "hybrid" has less fail parts and has the stalk you have but the "electronic" ones to my knowledge were a mid 90s gm roll out. Here ill show you what i mean

 

[AuroraGirl]

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This isnt a picture of my car(the blue) but the stalk is the pic I wanted to show. yours is like that right? That unit on the left is the cruise unit on my 1990 olds 88. its a vacuum powered unit but its electronic controls on it. If your truck has cruise it probably has this similar setup?

 

[Bextreme04]

Is this an 89 Crew Cab or an 89 GMT-400 pickup? I think the 89 Squarebodies had a mechanical speedo with the optical sensor on the back of the speedo that fed the VSS pulse to the computer and cruise control. It wasn't until 90 or 91 that they finally went fully electric on everything. Maybe the GMT-400 started a bit earlier?

 

[gmbellew]

my 1990 burb has an electronically controlled vacuum system for cruise control.

 

[AuroraGirl]

Is this an 89 Crew Cab or an 89 GMT-400 pickup? I think the 89 Squarebodies had a mechanical speedo with the optical sensor on the back of the speedo that fed the VSS pulse to the computer and cruise control. It wasn't until 90 or 91 that they finally went fully electric on everything. Maybe the GMT-400 started a bit earlier?

Okay I think im getting mixed up because fully electric in gm terms is a small box that is visible on the firewall here:

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ignore the circle. see the square box on the middle ish by the master cylinder? thats a electronic cruise control module from GM i think they used the same or similar one on a lot of vehicles with throttle bodies with cables in the 90s and early 2000s. That is the entire cruise system minus the cable and the switch on column. The prev pic i posted is 1 of like, 3 or 4 big parts that is electronically controlled but it uses vacuum lines and has a vac line to the column area at least on a car. That is a vacuum electronic. it seems the gmbellew has the system as he said in a 1990 suburban.

The older, cable driven with vacuum motor with the chain things and the gear set on the transduscer etc etc that was "the old" system which gm had way more than one iteration of and they were seemingly all over the place

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heres parts of one on a 260 oldsmobile v8 from 79 or possibly 80. those systems had a fender mounted box usually with speedo cable going into and one went to the cluster I think.

 

[Snoots]

Yes it will work. I'll try to attach a diagram. It's for a Fiero but it's GM so should be very similar. I have other directions as well if you think they might help.

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