Tbi swap build thread

[rfmaster]

Originally Posted by 65Guy

im still gathering parts for the swap but i plan on using a vss with my th350. but what if i switch to a 5 speed with no speedo cable provisions what then?

JTR offers differential mounted 40-Tooth Reluctor Ring.



This setup uses a stock vehicle speed sensor (GM part #15547452) which was commonly used on transfer cases of 1989 and newer S-10 truck, AWD Astro Vans, and 1987 and newer full-size 4X4 trucks. The combination of VSS and 40 tooth ring provides 40 pulses per drive shaft rotation signal which would require you to get VSB module to bring it down to 2000 ppm required by TBI ECM. This way you can get around lack of speedometer provision - however I would imagine that these 5 speed tranies would have a built in VSS output which can be coupled into VSB and correct 2000 ppm needed by TBI ECM can be attained. So I would look for a built in VSS and figure out its output characteristics before diving into reluctor ring approach.

As for speedometer - OE gauge will have to be replaced with an electronic unit.

//RF