Posted by Ron on November 19, 05 at 10:25:34:
In Reply to: Re: Something is posted by #1 Son on November 19, 05 at 09:48:26:
What? Has anyone changed their's that can chime in? I saw the box and whatched them do it. I never left the shop. I can tell the difference 100%!
I know this, when I had my '89 suburban and went with the 265/70/16 and changed the 3:73 to a 3:42 I went to have the speedo checked in Riverside, Ca. they put it on a dyno or something and said the speedo was off 1mph! Remember? I posted it. So, maybe the change in the other direction is the same not much difference. I'll take pics of gear and pinion and they do the fluid change to show it's a 4:10
: : I didn't change the speedo "re-calibrate". I watched them change everything out. I went to DTD as a few here have (same place I did the '89 suburban). It took them 4hrs. I watched them the whole time.
: : : : : Changed the rear from 3:73 to 4:10. What a difference! No rpm change at all. Still 2300 @ 80mph. Would do it again... DriveTrainDirect.com did a great job as always (They did my other suburban).
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: : : : If no rpm and speedo change and the same tire dia, then you got ripped off...it's the same gear ratio.
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: : : This is assuming you had the speedo re-calibrated. You did right?
: : : Otherwise any change in diff gearing will still have the speedo & tack read exactly the same, as they are reading it "before" the diff.