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b454rat · 09-30-2017, 06:42 AM

There is a VSS thingy on the back of the factory speedo, I want to say it was for cruise control, but don't know how it works. Also is it a 6 lug or 8 lug? 2500 could have either tranny but if it's an 8 lugger it will be the 4l80. Again not sure how it works, but a cluster from a 91 will have the VSS, all electric, no cable speedo.

09-30-2017, 06:42 AM	#2
b454rat Senior Member Join Date: May 2004 Location: Binghamton, NY Posts: 3,454	Re: Long Time Listener, First Time Caller.. 85' swap There is a VSS thingy on the back of the factory speedo, I want to say it was for cruise control, but don't know how it works. Also is it a 6 lug or 8 lug? 2500 could have either tranny but if it's an 8 lugger it will be the 4l80. Again not sure how it works, but a cluster from a 91 will have the VSS, all electric, no cable speedo. __________________ 2000 GMC CCSB 454/4L80 6” lift SAS 1999 Chevy CCSB 454/NV4500 6” lift 1999 GMC Yukon 350/4L60 4" SAS