8 1/4 Rear End

[BubbaMope]

Does anybody know of a good tech instructions to install a sure grip unit in an 8 1/4 rear end? Seems I never have the cash to pay anybody to do anything and this rear end will be no different.

 

[72 charger]

Know anyone who has a service manual for what year car it came out of? I used a mopar performance service manual that basically breaks it down step by step to assemble the carrier to the bolts on the backing plate practically only trouble I had was not having the proper tools to set the pinion depth.

 

[moparmaneast]

Are you changing the gears at the same time, or just the diff itself? Do you have a press to install the side bearings? Also do you have a magnetic base micrometer? I'm sure the interwebs has a writeup somewhere on how to install. Do you have any axle experience?

 

[sleepar]

This is something that makes for a nightmare without a shop press some reamed out pinion bearings marking compound etc... I'm all about on the cheap... but without the right tools... I'm sending mine out and also sending out my rotating assembly for balancing and piston pin press and rod reinforcing... and have a glass company do my front and rear window seals... I saved enough labor on everything else... not saying it can't be done just no you're limit

 

[bm02tj]

Do not waste your money on that rear end
It is also best to save money by paying to have it done right

 

[Cranky]

There's a lot of info on the net about how to work on rear ends just like there is on the rest of the major components of a car. I learned the hard way by having to use books

 

[Meep-Meep]

Keep in mind that the SG unit needs to match up with your intended gear set. There is a tall gear SG unit that will not accept 3.55's.

 

[BubbaMope]

Keep in mind that the SG unit needs to match up with your intended gear set. There is a tall gear SG unit that will not accept 3.55's.

Thank you to all for the input and really scaring the crap out of me. The car is a 1970 Belvedere 2 door Post, original numbers matching 318/904. She has 90K miles and I want to keep the original drive train in her thus the rework on the 8 1/4 diff. I was not aware of the tall gear unit, I'll need to check P/Ns when I get home. I was a jet mechanic for 26 years until I retired so I have the basic skills to do the job and there are shop presses nearby for anything that needs it. I can find step by step instructions all day long for the 8 3/4 units. I ran a brand X car years ago with a 10 bolt rear and T-350 trans with no trouble, I'd think my current set up would be OK for a goal of 325 horsepower.

 

[bm02tj]

Store the 8 1/4 in case you want it and install something better suited to the power

 

[WP29440SE]

there are guys running over 500 horsepower with 8 1/4 rear ends that are holding up just fine. build the 8 1/4 and don't look back.

 

[BubbaMope]

Thank you sir, I'm feeling the same way. I had wanted to locate an entire driveline, engine to rear end but finding the RIGHT parts at a reasonable price seems impossible these days. If I blow up a part I'll see about upgrading it when cash flows. With the current economy and my pay being frozen for 5 years it just isn't going to happen for a while. I guess it wouldn't be as much fun if I could just drop her off and write a check when they are done but I can still dream about it...