Rear End Number?

[FastbackJon]

Normally we should find a 741, 742, or 489 case under our Chargers if it's an 8 3/4.

My '68 R/T Charger looks to have a "1634983".

What the heck did that come out of?

[69CoronetRT]

My '68 R/T Charger looks to have a "1634983".

What the heck did that come out of?

That's a 57-67 casting. 1 3/8 pinion. Same size as a 741 casting.

[John_Kunkel]

Actually, there is no 1634983 but there is a 1634985 which is an earlier version of the 742 with a 1 3/4" pinion stem.

The earlier version of the 741 is 1820657.

[FastbackJon]

It's definitely a '3'.... so?

[John_Kunkel]

Got a pic? I think you'll find on closer inspection that that 3 is actually a 5, the gaps in cast letters tend to close up on some castings.

[FastbackJon]

I need to do some adjusting on the electric pump under there so when I do that I'll get a pic and a pencil rubbing. I'm pretty sure, but you never know.