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Prndl problems cant find anywhere!

99rcsb

By 99rcsb
March 22, 2022 in Gen III & Gen IV V8 Engines (LS-Based)

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99rcsb

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99rcsb

Posted March 22, 2022

Posted March 22, 2022

Ive been looking all over and cant find anything anywhere but i swapped the 4l60 out of my truck and put a 4l80 in. My odometer shows up and works and the prndl is lit BUT the rings that show your gear indication dont appear. Has anyone else had this happen before?

Senior Enthusiast

shakenfake

Posted March 23, 2022

Posted March 23, 2022

You have the correct swap harness?

Did you pin the PCM correctly?

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  By Grumpy Bear · Posted 1 hour ago
  
  Nice result. Your filter is working well I'd have like to have seen the acid number for this sample. Curious type that I am.
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  By jgaudet99 · Posted 1 hour ago
  
  Thanks I'll check that page out.
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  By Chuck FB · Posted 2 hours ago
  
  You may have come across this chart before and ironically this is a Toyo printed chart but it applies to all brands of tire types typically sold in north america since they build the tires off of the same standardized guide lines. Page 32 I think is where you will find your tire size and type to use as a guide along with weighing each axle individually to figure out your minimum pressure you can carry safely at highway speed. See what your tire guy comes up with as I would be surprised if they don't have a tool that can do it as long as they know how to navigate the tool to find the right area for placard reprogramming. Application of Load Inflation Tables Version 2020-7
- Post your UOA, (used oil analysis) here
  
  By OnTheReel · Posted 2 hours ago
  
  Red Line 5w30 Euro, Fram Ultra filter.
- Tire psi
  
  By jgaudet99 · Posted 3 hours ago
  
  Thanks everyone for the help! I'm going to stop into the scales one of these days and weigh my axels, for the time being, I am going to run Toyo's recommendations and also do a chalk test. I have a tire shop that's going to try their scanner to reprogram and set the the factory psi values lower, and if they can't I'm going to order a scanner and do it myself!
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