741 vs 742

[eldubb440]

is this a 67 and down vs 68/69 thing? or a A body vs B body thing?

or maybe a more simple question is........ did 67 GTX come with 741 or 742?

 

[496 polara]

I would expect a GTX to have a 742. If I am wrong someone will let us know.

 

[R413]

Now you hit it on the head. 67 GTX #2 all day long. Open or sure grip.
Performance cars had #2. Last year for #2 is 1968.
Small blocks had #1.

I Owned
67 318 Belvedere #1 clutch SG
67 383-2 Belvedere trailer towing pkg #2 3.23 clutch SG

 

[Vaanth]

is this a 67 and down vs 68/69 thing? or a A body vs B body thing?

or maybe a more simple question is........ did 67 GTX come with 741 or 742?

A 1967 GTX with an automatic transmission was originally equipped with the "742" housing differential in the 8-3/4" rear axle.

The "741" is a 1-3/8" small stem pinion. The 1-3/8" pinion carrier used casting numbers 1820657 (1957-1964) and 2070741 (1964-1972). This assembly was typically used in low weight/low horsepower applications through low weight/medium horsepower and high weight/low horsepower applications.

The "742" is a 1-3/4" large stem pinion. The 1-3/4" pinion carrier used carrier casting numbers 1634985 (1957-1964) and 2070742 (~1961-1969). This assembly was replaced by a phase-in of the 1-7/8" pinion starting in the 1969 model year. 1970 Plymouth and Dodge mid-size models were the last models to use the 1-3/4" which appeared in a 2881489 case. This assembly was typically used in high weight/medium horsepower applications through high weight/high horsepower applications.

The "489" is a 1-7/8" tapered stem pinion. The 1-7/8" pinion carrier used carrier casting numbers 2881488 and 2881489 (1969-1974).
This assembly was introduced in 1969 and was phased-in to replace the 1-3/4" unit through 1970. Note: the 1-3/4" pinion also appeared in some '489' carriers during this period as noted earlier. By 1973, the '489' was the only unit available in passenger car applications. This assembly was typically used in high weight/medium horsepower applications through high weight/high horsepower applications.

 

[MoparLeo]

Go 742.