8 1/4" Question

-
My car is a 3 speed automatic, and I have heard of 2.76 ratios. Which would make sense for what was a fuel efficient car. Does anyone else have any input?
 
i know the 2.76 was a ratio...the 7 1/4 i pulled out of my dart had that also i know there was a 2.94 as well...i had a 76 aspen with a 2.94 8 1/4 rear...ill have to look but i have an old a$$ manual with the housing size and available rear end ratios...more to follow...
 
ibleedmoparts said:
i know the 2.76 was a ratio...the 7 1/4 i pulled out of my dart had that also i know there was a 2.94 as well...i had a 76 aspen with a 2.94 8 1/4 rear...ill have to look but i have an old a$$ manual with the housing size and available rear end ratios...more to follow...
Click to expand...

Thanks for the help, do you know what spline axles came in a 8 1/4"? From what I have seen at other sites, I am thinking 27 spline, but not positive.
 
The manual i had was 64-72 mitchell....it did however have ALL available ratios for 8 1/4 and 8 3/4 rears...not sure of the splines but ill call my father tomorrow and have him count....i have a bent axle out of my 8 1/4
 
Not trying to hijack the post. But I have an 8 1/4 question also.

Does anyone make disc brake conversion for the 8 1/4?
THANKS
 
I have a 8 1/4" I always thought it was 2.76 as well. I got 18 mpg average from Los Angeles To Houson.
 
My duster came with 8 1/4 3.21 sure-grip. However it also had the 360 4 bbl. from the factory. I geuss one could probley get the 3.21 sure-grip for any eng. combo if the box was checked on the order form.
 
plum360415 said:
My duster came with 8 1/4 3.21 sure-grip. However it also had the 360 4 bbl. from the factory. I geuss one could probley get the 3.21 sure-grip for any eng. combo if the box was checked on the order form.
Click to expand...

I don't believe mine would have came with 3.21s because the original owner was a older lady who only drove a mile to and from work. I know it didn't come with a sure grip.
 
2.76 or 2.94 or 3.21 most likely. Pull the cover and count teeth to be sure. The early 8 1/4's have 27 spline axles and the later Dakota ones have 29 spline axles.
 
MY340 said:
2.76 or 2.94 or 3.21 most likely. Pull the cover and count teeth to be sure. The early 8 1/4's have 27 spline axles and the later Dakota ones have 29 spline axles.
Click to expand...

I will have to do that, although I am thinking when I do that will be when i am replacing them.
 
Check this;

Replace that old gear fluid and look on the ring gear. The ratio will be stamped on the edge.
My 8-1/4 I picked up came from a '73 - 340 Duster (So he said and believe) The ratio is 3.21.
 
Look in your junk yards in your area for a Jeep Grand cherokee. They had 8 1/4 with disk brakes. I remember someone did this and the only real fabrication was minor.
 
I used dino oil last round. I also have a few "Whale oil" bottles left.
I'm not super positive on this, but isn't the new synth fluid out OK without it. (Whale oil)
 
You must log in or register to reply here.
-

Back
Top