Rear-End Gear ratio question

[YY1]

The fender tag also proudly announces what gears were in it from factory.

If it has optional gears. I don't think standard gears were coded.

 

[33 IMP]

If it has optional gears. I don't think standard gears were coded.

Also might depend on the plant that built it, and even if it is there, it probably would need to be decoded. The actual ratio is NOT on the plate.

 

[RemCharger]

The fender tag also proudly announces what gears were in it from factory.

I do have it, but its pretty messed up. I will check tomorrow.

Under the A X
A
1: 2.76
2: 2.94
4: 3.23
X
8: Suregrip.

 

[Cranky]

False. All 8 3/4" axle assemblies use the same spline count. The only 3rd members that used different axle shaft lengths were early 60s cars.

I'm not familiar with the 65 and older axle assemblies but yeah on the 66 and up...41, 42 and 89 cases used the same spline count but the axle length differed between A, B, C, E cars etc. Don't know anything about the Imp cars. 65 and older used the tapered axle....but not sure of the spline count on those.

 

[33 IMP]

I'm not familiar with the 65 and older axle assemblies but yeah on the 66 and up...41, 42 and 89 cases used the same spline count but the axle length differed between A, B, C, E cars etc. Don't know anything about the Imp cars. 65 and older used the tapered axle....but not sure of the spline count on those.

To the best of my knowledge, ALL 8 3/4s were 30 spline. Axle lengths, housings, centers, and brakes are all over the place ! Not to mention various styles of sure grip and their complications.

 

[Kern Dog]

I'm not familiar with the 65 and older axle assemblies but yeah on the 66 and up...41, 42 and 89 cases used the same spline count but the axle length differed between A, B, C, E cars etc. Don't know anything about the Imp cars. 65 and older used the tapered axle....but not sure of the spline count on those.

There was a guy that wrote in to the Mopar Action Q&A about an early 60s era 8 3/4” axle where his own axle shafts did not fit after changing either from or to a Sure Grip. The response (not verbatim) was something like early model Sure Grips required shorter/longer axle shafts. I’ve never dealt with the early 60s 3rd members so I have no first hand knowledge of them.

 

[33 IMP]

Rusty? Buy a few gallons of molasses, (cheap at a feed store) get a five gallon bucket, throw the center in, fill with molasses and water, and cover with a lid
Take the center out in a few weeks, and see what happened.

 

[33 IMP]

I have a 489 That is Frozen from sitting too long. Is it possibly

Oops. Missed adding your quote to post #27. See that one.

 

[Ron H]

I switched out the 3:23 for a 3:55, one of a few mistakes I made during restoration. I opted to keep the poly and build that up some. My idea was that the 3:55 would offer some added low end giddy-up. What I mostly regret is the higher rpm’s at cruising speed which is where my car spends most of its time. IMO, should have left that alone. Have a ’63 Plymouth and swapped the rear to drop the tapered axles with a ’65 Dodge 742.