Vortec 5.7L swap questions - Page 2 - The 1947 - Present Chevrolet & GMC Truck Message Board Network

87squarebody · 01-30-2014, 06:47 AM

Quote:

Originally Posted by 1981Stepside

If it's an 1986 700r4, no you won't have to change your instrument cluster. Pre 1987 used a mechanical speedo cable and 1987-up went electronic IIRC. Easiest way to tell is to look at the drivers side of the tailhousing. If it has a spot for a cable, you're good.

Ok I have an 87 with 700R4 and mine has a cable.Im confused if it were electronic wouldn't it have a digital dash.

83GMCK2500 · 01-30-2014, 11:46 AM

Electric speedo is '90/'91. Gotta be a pretty late built '90 from what I've observed too.

01-30-2014, 11:46 AM	#27
83GMCK2500 Registered User Join Date: Sep 2009 Location: Beaverton, OR from WA State Posts: 1,515	Re: Vortec 5.7L swap questions Electric speedo is '90/'91. Gotta be a pretty late built '90 from what I've observed too. __________________ Devin 1983 GMC High Sierra 2500, 4x4, RC/LB, 400 S.B., SM-465, NP-208, Corporate 10 bolt & 9.5" 14 bolt 1996 GMC Sierra SLE 3500 DRW, 4x4, EC/LB, Vortec 454, NV-4500, BW-4401, AAM 925 & AAM 1050 1997 GMC Sierra SLT 1500 4x4, Z71/F44, EC/SB, Vortec 350 My Introduction with my '83s History New Daily, the '96



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