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Has anyone looked into just going back with the original Saginaw steering gear, I doubt anyone actually needs the extra steering effort supplied by the Sheppard gear as there are tons of other trucks without them..

Not exactly, if an injector it is leaking which causes the cylinder to fire early creating a knock, you crack the lines one at a time until the knock stops, then you have found the defective injector.

Welcome to the SS forums, a knock can be a bad injector, break each line loose one at a time and then re-tighten until you find the injector causing the knock

Moved to a more appropriate forum

I would hate to be on the side of the road with a 4 way lug wrench changing a wheel with those lug nuts, would be a fight both ways. On top of the fact they can be run in and deformed so much they may not hold the wheel properly

These are the ones I use, about .90ea shipped...

On top of the fact the speedo may have been changed it likely sat and ran as a power source which is the reason they put tachs in them.

I would expect it to be tighter, maybe too tight to turn with your fingers, but yes you have to be able to turn the input shaft or it will not steer. If it is full of fluid and the ports are capped then it would be hydro locked and very hard to turn, why the truck is nearly impossible to steer...

You are not turning the pitman arm, you are turning the input shaft. :LOL:

Yep, they are plain ol 9/16-18 lug nuts with 7/8" hex, zinc plated, the very first thing I replace on every HMMWV I get, you are correct over tightening them ruins them. Lug nuts are supposed to be "soft" so you wear them out long before the studs or the wheels. I don't know about the NAPA ones...

All of the 2009 and 2010 R1s I searched for are 4 speed, but the one I just bought was a 2008 and that year is mostly 3 speed.

I just look at the serial numbers when looking, all the 4 speeds I have seen have 57X,K serial numbers but there have not been many. The one I bought was the first one I have seen at the yard I like to go to in TX, not that some may have not slipped by, almost all selling down here are 3 speed...

I was notified the EUC was submitted and later the same day it was approved, so it does get faster the more times you submit an EUC. Will go and pick up my new treasure early next week. I am surprised I have not heard from any other 4 speed R1 owners...

You could have fixed it or even installed a GPS speedo that fits right in the hole for around $50, especially if you were ever concerned how far you have driven.

OH, in that case there is no possible way, speedos get changed all the time. I bought one junk truck that had a much newer speedo with very few miles on it that had just been stuck in the dash without even connecting, I pondered why someone would put that speedo in that junk truck. The only...

Is there some reason you do not have an odometer?

The 4L80 is not that smart, it was GM's first attempt at computer control.

He did his and I did mine.

Where did you get the numbers for these magnetic plugs? (DO NOT ORDER THESE!!) These are 3/4 NPT you are going to have one hell of a time trying to thread these into ether the drain or fill plug holes on those diffs. Oh well I guess I have them just in case I ever actually need them, of course...

Well you called it an A1 in the first post, R1/A1 makes no difference if it is a 3 speed, as I said I did not think you were using the correct troubleshooting guide. If there is no indication of failure, fluid, particles in the pan etc. I would put it back together and make sure it is not a...