1973 340, want more power.

rumblefish360 said
Search member "webby" for a 3.91 complete set up.

Thanks!
He has this for sale....
8 3/4 3.91 Sure grip 489 New Nodular Iron Case
New sure grip unit, bearings, u bolt style yoke. Ring and pinion, crush sleeve eliminator, new nodular iron case, forged caps, billet adjusters ,professionally set up.
$1150.00 plus shippiNng

This is 225 usd less than the dr diff.... But is the dr diff one "newer"???

Also, this one from webby will fit my car for sure?

Thanks!!!