Gear ratio help!!

[myfirstcj7]

I am new to this forum and to cjs but i just bought a 1986 CJ7 with the following
-AMC 258 i6 / 4.2l (AMC 258 i6 / 4.2l )
-Dana 30 front, Dana 44 rear
-Dana 300 Transfer Case
-4spd manual tranny

Recently i was changing diff fluids and wanted to try to figure out my gear ratio and got 49 teeth on the ring and 18 on the pinion in the front which comes out to 2.72 is this right?

 

[rrekr]

That is right.

 

[tarry99]

I am new to this forum and to cjs but i just bought a 1986 CJ7 with the following
-AMC 258 i6 / 4.2l (AMC 258 i6 / 4.2l )
-Dana 30 front, Dana 44 rear
-Dana 300 Transfer Case
-4spd manual tranny

Recently i was changing diff fluids and wanted to try to figure out my gear ratio and got 49 teeth on the ring and 18 on the pinion in the front which comes out to 2.72 is this right?

Count the teeth again...........normal factory non option gears are 3.73:1 with a manual Transmission . and 3.08:1 with and auto.

 

[diddy2003]

Yup. Those are 2.73s.

Jeep Axle: AMC 20

Scroll to the letter codes. Your AMC20 , if that's what you have, will have a D or DD stamped on it. That would indicate a 2.73 gear. I hated that in mine. Went to 4.10s :drool: Good luck

Edit, saw you have a Dana 44 . Sorry about that.
http://www.jeeptech.com/axle/d30.html
http://www.jeeptech.com/axle/d44.html

Those don't have simple letters stamped on them. You still have 2.73s though.

 

[tarry99]

Yup. Those are 2.73s.

Jeep Axle: AMC 20

Scroll to the letter codes. Your AMC20 , if that's what you have, will have a D or DD stamped on it. That would indicate a 2.73 gear. I hated that in mine. Went to 4.10s :drool: Good luck

Edit, saw you have a Dana 44 . Sorry about that.
Jeep Axle: Dana 30
Jeep Axle: Dana 44

Those don't have simple letters stamped on them. You still have 2.73s though.

Diddy so did your Jeep start out with an Auto Transmission w/ the 2.73's?

 

[Old Dog]

Yep, most of the later 80's came with 2:73's for gas mileage, bad idea on jeeps part.

 

[Petescj]

Yup they sure did. I have a set of wide tracs in the garage with the 2.73s. Cant give them away. The carriers are small and need to be changed out to get you to any worth while ratio.

Yep, most of the later 80's came with 2:73's for gas mileage, bad idea on jeeps part.

 

[diddy2003]

Diddy so did your Jeep start out with an Auto Transmission w/ the 2.73's?

I have a T-176 /Dana 300 . It had 2.73s with open diffs. Sucked big time. Stamped with a D on the AMC20 . I am not the original owner so I don't know how it came from the factory.

 

[diddy2003]

Yup they sure did. I have a set of wide tracs in the garage with the 2.73s. Cant give them away. The carriers are small and need to be changed out to get you to any worth while ratio.

I scrapped mine. Got 75 bucks for them. I have two more sets of 2.73s and one set of 3.31s left. Not worth much of anything even though one set of 2.73s even has one piece axle shafts.

 

[mtnwhlr]

Yea 2.73 was very common in the '86 cjs they were trying to get better gas mileage to please big brother.

 

[hole]

2:73's in my all stock 8. Not great offroad, but fine on the highway. If I maintain 65-70mph the old girl has no problem getting 19mpg

 

[myfirstcj7]

looks like im going to be regearing then in the near future and also i found one out that the rear axle still had it tag on it what can those numbers tell me

 

[diddy2003]

looks like im going to be regearing then in the near future and also i found one out that the rear axle still had it tag on it what can those numbers tell me

What kind of rear axle?

 

[myfirstcj7]

Its a Dana 44

 

[Petescj]

Post up the numbers or a good clear pic of the tag.