You have a 68 RR? I agree, 48 is the code for a 3.23 sure grip.
Had JD, (below) and it had a 3.23 Sure grip but the question was really about a friend's '68 Hemi Road Runner that was a column 727 with an 8-3/4 and what he was surprised about. He had the car for a while and long story short about the car it wasn't what it was at the time of purchase. Different color and different trans and different interior color. He found out and returned it to the original way it came from the factory not the way the previous owner wanted it and down to the new WRONG fender tag.
We were talking and he said "You'll never believe what this car came with, never in a million years". To which I replied "it came with an 8-3/4 rear and a 3.23 OPEN differential ratio". He just about dropped his phone and yelled "How the he77 did you know that"????. So I told him the story of how back in '69 an older friend and I were tuning my new '69 RR (which you've seen too many times
) and we had just pulled the distributor out to tweak it when I realized I had to take my older sister to work. He said take my ('68 Hemi) Road Runner which was as bare bones as could be, RM21 coupe, column 727 rubber floor matt, no radio, No Nothing.....oh it did have the hood center between the scoops blackout. Head home to take my sister to work and my other five (yep 7 kids in the family) are waiting at the curb, sister jumps in and of course my brothers knew what a HEMI was in the hood scoop callouts. So I had to..........and to my surprise when I looked in the mirror there was only ONE TIRE MARK
I ordered my '69 with the super trac pack with 3.91 Suregrip and always two tire marks. When I took the Hemi back to finish working on my RR I asked if there was something wrong with the Suregrip in his Hemi and he said no it's an open stock rear, and I have a 4.56 or something like that to put in it so I ordered the RR with the least amount of options to build a (street) race car. I checked and the 3.23 open 8-3/4 was standard when you ordered the 727 in a Hemi Road Runner
.....who'd a thunk it? That car NEVER hooked up and it would put one tire mark down for as far and you kept your foot in it. I'd bet unless you were a pro level drag racer your best 1/4 mile times were in the high 14's, for me they would have been in the high 15's or worse with no Suregrip and a HEMI.
My '68 and of course my '69 back in 1969 and with my older sister waiting to be taken to work..................................she waited everyday before going to work for mail from her then boyfriend (now still husband of nearly 50 years
) that was in Vietnam on some hilltop be shot at. Knowing that I told her when she gave me this photo it was more than okay to lean on the car.
Mike