The 1947 - Present Chevrolet & GMC Truck Message Board Network - View Single Post - 89 TBI 350 in my 66....? also some parts swap questions....

**Captainfab** · 04-14-2008, 08:32 AM

If you go with the TH350 instead of the 700R4, you're going to need to install a device (can't think of what they're called....it's late) onto the speedo that will generate a VSS (vehicle speed sensor) signal for the ECM to read. It will run without it, but it will cause issues without the VSS. I've been through it on my '90 DD.

Regarding wiring diagrams, I bought a book at Napa that had engine wiring diagrams for cars and trucks...IIRC it is all GM too....was about $40 though

04-14-2008, 08:32 AM	#12
Captainfab 60-66 Nut Join Date: Mar 2007 Location: Coeur d'Alene, Idaho Posts: 23,254	Re: 89 TBI 350 in my 66....? also some parts swap questions.... If you go with the TH350 instead of the 700R4, you're going to need to install a device (can't think of what they're called....it's late) onto the speedo that will generate a VSS (vehicle speed sensor) signal for the ECM to read. It will run without it, but it will cause issues without the VSS. I've been through it on my '90 DD. Regarding wiring diagrams, I bought a book at Napa that had engine wiring diagrams for cars and trucks...IIRC it is all GM too....was about $40 though __________________ Power Steering Box Adapter Plates For Sale HERE Power Brake Booster Adapter Brackets For Sale '63-'66 HERE and '67-'72 HERE and '60-'62 HERE and "60-'62 with clutch HERE Rear Disc Brake Brackets For Sale. Impala SS calipers HERE Camaro Calipers HERE D52 Calipers HERE 6 Lug HERE Hydroboost Mounting Plates HERE Last edited by Captainfab; 04-14-2008 at 08:32 AM.