Truck Forums

Truck Forums (https://www.truckforums.com/forum/)

- Chevy Silverado/ GMC Sierra Forum (https://www.truckforums.com/forum/chevy-silverado-gmc-sierra-forum-11/)

- - help (https://www.truckforums.com/forum/chevy-silverado-gmc-sierra-forum-11/help-17787/)

joshstover69@yahoo.com

11-01-2011 12:10 PM

help

one of my customers swap a 5.7 for a 7.4 it is a 96 1 ton 4wd everything seems to work and it runs great but the speedo now works like a tac any thoughts

Mr_Shamrock

11-01-2011 05:09 PM

Does the truck have a tach? If not the ECM that they used for the 7.4 may have had one. Might need to get a cluster with a tach.

joshstover69@yahoo.com

11-02-2011 01:48 PM

yes it does have a tach and as an exp. i found and clipped the tach feed and it still happens i am 4th tech to l ook at it and one of those was the dealer lol

Mr_Shamrock

11-02-2011 08:18 PM

Maybe a speed sensor issue.

All times are GMT -5. The time now is 01:33 AM.