Very Strange Change - The 1947 - Present Chevrolet & GMC Truck Message Board Network

ubtripn · 08-03-2016, 10:39 AM

I have been watching my tach very carefully and also using a gps speedometer and yesterday I experienced a definite change.

2100 RPM's was 65.

Yesterday and today 2500 is now 65 and my OD is still working. Nothing was changed. It is so strange to me but like I learned with my temp issues, start with the gauge accuracy but it isn't bouncing our anything so I just don't know.

I hooked up the OD on my 700R4 a few weeks ago and felt the change, it is definitely still working.

Someone once told me how to identify my rear end gear ratio so I am going to do that. I still cannot figure this out, truck still runs good though. Anybody ever experience the same thing?

08-03-2016, 10:39 AM	#1
ubtripn Registered User Join Date: Apr 2010 Location: Boise, ID Posts: 1,280	Very Strange Change I have been watching my tach very carefully and also using a gps speedometer and yesterday I experienced a definite change. 2100 RPM's was 65. Yesterday and today 2500 is now 65 and my OD is still working. Nothing was changed. It is so strange to me but like I learned with my temp issues, start with the gauge accuracy but it isn't bouncing our anything so I just don't know. I hooked up the OD on my 700R4 a few weeks ago and felt the change, it is definitely still working. Someone once told me how to identify my rear end gear ratio so I am going to do that. I still cannot figure this out, truck still runs good though. Anybody ever experience the same thing? Last edited by ubtripn; 08-03-2016 at 11:01 AM.

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