Area Representative gileshudson Posted July 24, 2018 Area Representative Share Posted July 24, 2018 I had a 3.92 open diff. I bought a Quaife ATB diff brand new and sent it down to Phil at R&R. I asked if they could sort and refurb a Sierra casing so that I coudl keep the open one intact. They did exactly that and then installed the Quaife into it and sent it back by courier. We fitted it and I think it is quieter than the open one we took out. It's whisper quiet... so it can happen Link to comment Share on other sites More sharing options...
Tom_Arundel Posted July 24, 2018 Share Posted July 24, 2018 Clive The backlash changes by about 0.04mm per lug / castelation and should have 4 - 6 lugs preload Link to comment Share on other sites More sharing options...
Clive H Posted August 12, 2018 Author Share Posted August 12, 2018 Hi allProblem solved now.Adjusted diff bearing carriers in situ and added RED LINE HEAVY ShockProof Gear Oil.Result is amazing and diff is almost silent now.Clive Link to comment Share on other sites More sharing options...
Wrightpayne Posted August 12, 2018 Share Posted August 12, 2018 Klive,did you tighten one side only or slacken one, tighten the other to effectively move the whole thing over? How many notches??RegardsIan Link to comment Share on other sites More sharing options...
Barkalarr Posted August 14, 2018 Share Posted August 14, 2018 I know this post is now *sorted* however, if there is anyone else who requires a sierra diff, I have a 3.38 and 3.14 push in shaft at the back of the garage gathering dust I'd be happy to part with.On a different note, the Sierra diff in my "superstig" (See Aug 2018 LF Mag) knocks when you accelerate and decelerate - it's the sort of knocking where it sounds like there is a loose bolt (which there isn't) in the fixing points. I have the strengthening bars up through the boot floor - nothing obvious is loose but still is continues to annoyingly knock each time you press the loud pedal. I'm guessing there's something somewhere inside the diff which is loose so it needs to come out of the car and be rebuilt by R & R.Does anyone else have this problem or is it just mine which needs a winter refresh ? Link to comment Share on other sites More sharing options...
Martin J Posted August 17, 2018 Share Posted August 17, 2018 Road & Race transformed my sierra diff. I only put up with the whining noise for 10 years! A rear end tap & repair made me get on with it. Link to comment Share on other sites More sharing options...
Recommended Posts
Create an account or sign in to comment
You need to be a member in order to leave a comment
Create an account
Sign up for a new account in our community. It's easy!
Register a new accountSign in
Already have an account? Sign in here.
Sign In Now