Rear end gears?

[DynaSlim]

Question, I have 2 rear ends both junk 10 bolts but one is in Better condition wise with rust but it has limited slip stock gears. Other rear end is pretty rusty and would take a good amount of sanding and paint to get looking good but it has a posi unit with 4.10 gears.

Question is, would it be a better idea to swap the units or leave it and just swap the entire rear ends? I already know that gear is probably going to break my first hard launch but it'll be fine for now with just cruising.

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[daturbosix]

any time/money spent on a 10bolt is wasted. keep that in mind.

 

[DynaSlim]

Ok. Well no money is being spent just some wrenching time

 

[RenoReno2]

Wire wheel it and por 15 it before swapping all the guts

 

[DynaSlim]

I had plans in that direction with either one I went with. Just wasn't too sure how the surface rust would effect a rear end vs one that doesn't have much at all and the job of pulling both out to swap, entire rear end vs just the internals.

Oh and I'm doing the rear end bright red so everyone knows who it is when they are behind me losing.

 

[Mr_Roboto]

Easier to find bits of a fragged 7.5 if they're red that's for sure. In all seriousness though, if it's a quiet rear without a million miles on it and the posi works, it's better to toss it in as is. Unless you know what you're doing with setting up gears, it can be a hassle. Change the fluid, find a rear cover with cap supports, if you're feeling real frisky do a solid pinion spacer on it but expect it to knock some teeth off the gear set eventually especially with high numerical gears. If you haven't ever set a rear up youtube it, I'm sure someone has a video. It's not really difficult it just takes a significant amount of patience.

 

[DynaSlim]

Thanks and no I'm not a patient person. It already had a T/A cover on the rear but not sure that really does anything for the gears sake. I'm hoping with an auto it'll hold up a little better then slamming it with a manual trans would do.

 

[Gone_2022]

By T/A cover you mean a girdle. And yes it does help a little. It supports the main caps so you don't shit them out under heavy load. Had one on the Camaro SS. Totally saved us at pinks all out on a 10 bolt 373 gear 4400 stall cutting 1.6 60fts

 

[DynaSlim]

yeah pretty much. W/e that thing is, girdle I guess. That rear just looks nasty tho. Maybe after cleaning up and por 15 it'll make me feel better.

 

[Gone_2022]

I'd be less concerned on how it looks on the outside and more concerned on internal condition. Just based on the climate we live in rust can form on garaged cars

 

[School Boy]

Wow, that's rusted to hell.

 

[cam]

Run the thing, why volunteer for more work that no one will see? Plus setting up gears properly can be quite time consuming. Ive seen a lot rustier diffs than that one so paint it and go is my vote

 

[DynaSlim]

Here's the other one

 

[Gone_2022]

Again I would just pick one and leave the gears and all installed. I have done posi units and gear changes at Siu. It is nothing to mess around with if u don't know what your doing. Crushing collars, rotating teeth contact, setting back lash all requires special tools that you may not have. Do it wrong and it will be in pieces on the hwy.

 

[cam]

When you clean and paint the rusty one it'll look better. Heres a tip for paint get oil base DMT satin or flat black, bites hard, lasts long, goes on fast and thick one good brush coat.