Hey Guys,

I was hoping you guys could give me a little hand as i've been searching and am not sure where to go.

I have a 1988 GMC Sierra SBSC with a 1983 g30 van 4 bolt mains and an all forged eagle rotating assembly internally balanced (Yes, I want any transmission i'd like to fit whenever). I'm currently building a th400 with all hardened internals, shift kit, and servo and am wondering what i'll need for a VSS Sensor.

I know mechanical=2000 and electrical=4000. The transmission out of the same van has a mechanical speedo, and i'm assuming i need to integrate an electrical with a 4k pulse? Could someone confirm this, and if so i'll check jags that run to make sure they have the correct one.

Also I know i need to check the manual flag for transmission.

I'm really confused and am debating just going back to my t56 6 speed, but it's going from a cruiser to a track ****. I appreciate any and all criticism, feedback or hints.


EDIT:

There are four types of VSS signals required by the engine computer (ECM): 1.The two-pulse (2000 pulses per mile) square wave (D.C. current or direct current) used on all TBI engines through 1992, all computer-controlled-carbureted engines, and on 1985–1989 TPI engines. 2.A four-pulse (4000 pulses per mile) sine-wave (A.C. current or alternating current) signal is required by the 1990–1993 TPI, 1992–1993 LT1 engines, and 1990–1993 Camaro 3.1/3.4 V6 engines. 3.A 40 pulse per driveshaft revolution speed sensor used on 1993 and newer trucks with automatic transmission, 1994 and newer rear drive cars (Camaro, Corvette, and Caprice) with the automatic transmission. 4.A 17 tooth per driveshaft revolution speed sensor used on 1993–1997 LT1 engines with the Borg-Warner 6-speed transmission. An 11 tooth reluctor ring is used on 1993 LT1 engines with the Borg-Warner wide ratio (3.35 First gear) 6-speed transmission.

I don't know which one I want, and what I have to do configurations in the ECU for (I can visit DIY PROM after for those answers)
2.A four-pulse (4000 pulses per mile) sine-wave (A.C. current or alternating current) signal is required by the 1990–1993 TPI, 1992–1993 LT1 engines, and 1990–1993 Camaro 3.1/3.4 V6 engines.3.A 40 pulse per driveshaft revolution speed sensor used on 1993 and newer trucks with automatic transmission, 1994 and newer rear drive cars (Camaro, Corvette, and Caprice) with the automatic transmission.

- B