I got the Van back this afternoon along with a boxfull of nifty oily parts. I figure I paid about $80/pound for them....
We now have a 4.10 ratio in the back (in place of the 3.73), and I am imformed that the LS clutch packs are nice and tight.
I had two problems: the pinion was moving back and forth due to a smashed flat spacer and the carrier bearings were shot. The moving pinion made a new pinion & ring gear necessary, so we went for the 4.10.
The drive home was oh-so-quiet! I can actually hear wind noise again!
AND the speedo seems to read fast. so, after reading what I could about rear end ratios & programming things & speedo, I still have a couple of questions:
I think the mechanical speedo & odo in my van is driven by a cable from the transmission.
If you change tire size and therefor tire diameter, then you need to change the gear ratio (at the tranny) so the Speedo & odo read correctly.
If you change the rear-end ratio, you need to do the same thing.
Does the engine control system need to know what the rear end ratio is? Or does it get it from the Speedo?
The "pencil gear" that drives the speedo-is this an off the shelf thing at a dealer? Can I tell him what rear end ratio I have and how many tire revs per mile my tires give and can he "select" the right gear?
BTW- here is the URL for one of the troubleshooting guides I found: