1970s vs 1980s CJ AMC 20

[Bent]

I was just noticing how much beefier the 1970s CJ AMC 20s are. Someone may find this interesting.

1982 on the left, 1977 on the right.

 

[Posi]

What is the tube diameter? CJ AMC20 should be 2 5/8" the FSJ AMC20 2 3/4" The FSJ 20 is the same size as the FSJ 44.

 

[Lumpy Grits]

That bigger one is from a truck. Also has thicker tubes and 1 piece axles.
LG

 

[Peanut Butter]

That bigger one is from a truck. Also has thicker tubes and 1 piece axles.
LG

Maybe not? Here is a picture of mine. I'm pretty sure it is the original axle and it is like the big one in Brent's pictures. Mine is a '79 CJ7 . Rod

 

[Lumpy Grits]

PB-Does yours have 1 piece axles?
The truck ones were wider than a CJ's.

LG

 

[Bent]

That bigger one is from a truck. Also has thicker tubes and 1 piece axles.
LG

They are both narrow track CJ5 axles. Tube diameter is 2.50"

 

[Bent]

Looks like my pictures rotated the wrong way. The first picture shows the 1977 CJ5 axle on the left. The second picture shows the 1982 CJ5 axle on the left.

 

[Lumpy Grits]

They are both narrow track CJ5 axles. Tube diameter is 2.50"

Thicker-I meant as in wall thickness of the tube.
Never seen the 'big' 20 from a CJ. Just the trucks.
LG

 

[Peanut Butter]

I don't know about the one piece axle. I haven't tore into it yet. But now I'm excited to. Here's hoping for a one piece axle. Below is a better picture of the whole axle. I'll post the results back here for everybody with what I find. Rod



Found this picture. If you look at the rear hub, looks like a two piece to me. So, I thinking not.

 

[Lumpy Grits]

Yup-Looks like a 2-POS axle to me also.
LG

 

[Bent]

Thicker-I meant as in wall thickness of the tube.
Never seen the 'big' 20 from a CJ. Just the trucks.
LG

The wall thickness may be thicker on the 1977 axle. I don't have a caliper that will reach down the tube but, the 1977 looks like the tubes are reduced more than the 1982 where they press into the housing. I wonder if the 1980s FSJ axles used the lighter casting or if they continued to get the heavier casting.

Anyone experience tube flex issues with a 1970s vintage axle?

 

[Peanut Butter]

[/QUOTE] Never seen the 'big' 20 from a CJ. Just the trucks.
LG[/QUOTE]

After researching my GM Turbo 400 Transmission origin, I'm finding lots of stuff that may not be OEM. The GM Turbo 400 came from Cadillac. Some of these are found in FSJ. So my rear axle may be from a FSJ truck. Also my QuadraTrac was a 1305, not a 1339. I've been told that the 1339 was always in a CJ, but an option in a truck. Rod

See this thread http://www.jeep-cj.com/forums/f2/jeep-th400-technical-information-24384/

 

[Lumpy Grits]

AMC--------
Almost A Car

LG

 

[Old Dog]

AMC--------
Almost A Car

LG

Or. All Makes Combined.

 

[Lumpy Grits]

Or. All Makes Combined.

All MISTAKES Combined-


LG

 

[Peanut Butter]

Or. All Makes Combined.

Ain't that the truth! Rod