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07-09-2010, 08:46 AM
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#1 |
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Getting Old; Going Broke
Join Date: Apr 2010
Location: Owasso OK
Posts: 2,764
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Speedo Swap
I am wanting to swap out my 85mph speedo with an earlier 100mph speedo. I realize I will not be able to connect the VSS (guess that's what it's called) little green box to the older style. Question is, can I just remove that box and the wiring going up to the speedo? Or for some reason do I need it there for some sort of resistance for another reason? Yes I know my cruise won't work.
Year is an '87, I think the speedo said it was from like a 76-79. I'm really not seeing any issue with just removing that VSS from the loom, but wanted to be sure. |
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07-09-2010, 09:15 AM
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#2 |
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Slots go on anything!
Join Date: May 2003
Location: Richardson, TX
Posts: 5,957
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Re: Speedo Swap
The VSS also controls TCC lockup, EVAP purge, and cruise. Not having the TCC hooked up will cause excessive heat in the transmission, and can kill the trans if left that way. The truck may run a little hotter as well. (this is experience talking, BTW).
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1974 Jimmy- 5.3/4L80e/NP241 |
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07-09-2010, 09:32 AM
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#3 |
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Getting Old; Going Broke
Join Date: Apr 2010
Location: Owasso OK
Posts: 2,764
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Re: Speedo Swap
So can I just leave the box dangling in the back but not hooked up to the speedo? Or is that just still making it all not work?
I'm guessing it is sort of required to send a signal telling the computer what the speed is to help regulate the other stuff as well as the cruise? Now I'm confused. |
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07-09-2010, 10:10 AM
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#4 |
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Slots go on anything!
Join Date: May 2003
Location: Richardson, TX
Posts: 5,957
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Re: Speedo Swap
Just leaving it dangle will still cause all of the above. Same with a broken speedometer cable (that was the case with mine). With your truck being fuel injected, it is required to keep everything happy. It seems like it may have a hand in injector pulse, as well. It needs to stay.
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1974 Jimmy- 5.3/4L80e/NP241 |
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07-09-2010, 10:32 AM
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#5 |
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Getting Old; Going Broke
Join Date: Apr 2010
Location: Owasso OK
Posts: 2,764
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Re: Speedo Swap
Well crap.
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07-09-2010, 01:54 PM
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#6 |
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Registered User
Join Date: Jul 2009
Location: West Jefferson, OH
Posts: 999
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Re: Speedo Swap
You should be able to run an aftermarket VSS that's meant for TBI swaps.
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-Andy '77 K5 Blazer '78 K10 Shortbed '78 C20 Suburban '79 K30 Crew Cab Dually '84 C10 Short Stepside '88 K20 Suburban 
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07-09-2010, 02:10 PM
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#7 |
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been here longer than Liz
Join Date: Feb 2000
Location: Broken Arrow, OK
Posts: 2,437
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Re: Speedo Swap
And you're required to have a 40g Suburban tank to make it all work.
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~Greg~ Mac's Garage '87 SWB 6/8 drop "Piso" '08 CCSB Silverado DD the departed '89 GMC K5 Jimmy 4x4 "Rusty Nuts" '77 Chevy K5 Blazer 2wd '83 Chevy stepside "You get what you pay for" - Mike 'swervin ervin' Ervin |
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07-09-2010, 02:23 PM
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#8 | |
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Getting Old; Going Broke
Join Date: Apr 2010
Location: Owasso OK
Posts: 2,764
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Re: Speedo Swap
Quote:
 Seems my speedometer (used the one out of my parts suburban, at least I can have a trip meter this way) still bounces at lower speeds. Can you just slide out the cable inside the speedometer cable housing? Seems I recall doing this once on an older truck. Slid it out and greased it and slid it back in. |
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