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Another 8 1/4 Rear End question..please..
https://slantsix.org/forum/viewtopic.php?t=43221		 Page 1 of 2
Author:  militos [ Wed Jan 12, 2011 1:23 pm ]
Post subject:  Another 8 1/4 Rear End question..please..
Hello every one, I just purchased a 8 1/4" Rear end, this one the guy said s that came out from a A body, it has the big bolt patern, so it be perfect for my car.

The question I have today is ,,,is my existing drive shaft going to fit into that rear end, or I do have to modify it, cut or enlarge?, or any other changes I have to consider before I take my old 71/4" rear end out?

Remember... my car is a Dodge Dart 1965, with a 225 slant six and a automatic trans, engine and trans are stock.

thanks.
Author:  Joshie225 [ Wed Jan 12, 2011 2:12 pm ]
Post subject: 
Your driveshaft will need to be shortened as the rear U-joint of the 8 1/4 is farther forward than with the 7 1/4. According to this chart it's 1.60" farther forward.

http://www.moparts.org/Tech/Archive/axle/5.html
Author:  militos [ Wed Jan 12, 2011 5:37 pm ]
Post subject: 
Thanks Señor Joshua Skinner.

how about the U-joints? are they the same or I may need to modified one end of the drive shaft?

thanks again.
Author:  Joshie225 [ Wed Jan 12, 2011 6:39 pm ]
Post subject: 
Oh, the u-joint is the same. :)
Author:  ESP47 [ Fri Jan 14, 2011 10:44 am ]
Post subject: 
I have a driveshaft here from a 73 Valiant. It went from a slant 6 and 727 tranny to an 8 1/4" rear. Not sure if it's the same length as a 904 to 8 1/4" driveshaft. Maybe someone will chime in and let us know. If it is you can come pick it up for cheap. It just doesn't have the slip yoke because I need it for my 4 speed conversion.
Author:  Joshie225 [ Fri Jan 14, 2011 12:23 pm ]
Post subject: 
727s are longer than 904s. Doesn't matter in this case though because he doesn't have a slip-yoke output transmission.
Author:  militos [ Fri Jan 14, 2011 1:14 pm ]
Post subject: 
Acording to the link that I got from Joshua Skinner I'll be modifiing my original drive shaft, I'll take it to a profesional shop to do the job do, I dont want my drive shaft falling on teh hig way.

thanks every one, I just went to pick up the rear end,,it looks real clean,,no greasse at all or dirt,,I just need to take it apart , replace the seals at the ends..and so on..do some celanning and paninthing before I install it into my Baby 65 Dart.

The transmission is the original one, the old previus owner lady did rebuilt the trainny before I got the car (I'm lucky).

thanks again.
Author:  werntonb [ Wed Feb 16, 2011 10:01 pm ]
Post subject: 
Quote:
Your driveshaft will need to be shortened as the rear U-joint of the 8 1/4 is farther forward than with the 7 1/4. According to this chart it's 1.60" farther forward.

http://www.moparts.org/Tech/Archive/axle/5.html
Nice size of the rear axle. That's what I need.
Author:  militos [ Thu Mar 17, 2011 2:10 pm ]
Post subject: 
mis Amigos, I have a Rear End Gera size question..

I opened the rear end to see the numbers that are stamped in the Ring gear, and this is what I have, hope some one can tellme what type of ratio I have: 2852923 245 7 21 75 2
I need to know what I have, it is a 8 1/4 rear end that I purchased few months ago.

thanks.
Author:  Doc [ Thu Mar 17, 2011 2:15 pm ]
Post subject: 
Is the "245" really 2.45?
DD
Author:  militos [ Thu Mar 17, 2011 2:33 pm ]
Post subject: 
yes, that's the number I got , is it rare?

let me go back to look, (man,,I have to remove that cover plate again!!), ja,ha,ha,ha.

I'll be right back.
Author:  Doc [ Thu Mar 17, 2011 2:43 pm ]
Post subject: 
2.45 is the gear ratio, those are pretty common.
DD
Author:  militos [ Thu Mar 17, 2011 2:55 pm ]
Post subject: 
yes! it is a 245 number. hope you can see the picture.
<a href="http://s208.photobucket.com/albums/bb262/rockactualizate2/?action=view&current=245Rearendnumber.jpg" target="_blank"><img src="http://i208.photobucket.com/albums/bb262/rockactualizate2/245Rearendnumber.jpg" border="0" alt="8 1/4 rear end ring gear nuber"></a>

thanks.

Image
Author:  Doc [ Thu Mar 17, 2011 3:05 pm ]
Post subject: 
What is the gear tooth counts?
Divide the number of ring gear teeth by the number of pinion teeth.
54 / 22 = 2.45
Author:  Joshie225 [ Thu Mar 17, 2011 3:06 pm ]
Post subject: 
2.45 gears were common with V8s. They are not very fun with a slant. I hope your car is an automatic.
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