I want to know how can I make a 10 bolt posi rear with 3.73 gears handle 400 hp.

26 spline axles are in this rear end.

 

depending on if its a 7.5 or an 8.5 inch rear...

8.5" rear are crazy strong! and should hold 400 no problem stock...

but there are things like getting welded axles and such.

 

What year car is this in? If it's in a 1st-gen or 2nd-gen, you've likely got an 8.5" 10-bolt, and I agree with talos........they're capable of standing up to 400 HP no problem. To check what you've got, just measure the inside diameter of the ring gear............it'll likely be 8.5", but could be 7.5", in which case you would want to upgrade.

 

It's an 86. Camaro z28.

But the rear end comes from an 88 Iroc.

It's posi and will have 3.73's

 

u have a weak 7.5 rear. i dont think there much u can do to make thos "very" strong.

 

The guys in the third gen forum might be able to help a bit, so I'll move this over there for ya

 

Only run street tires.

 

make sure it's freshened up and have at it...plenty have ran more and been ok. this idea that everything is needed to be replaced to have power isn't necessarily true. however, it should be in properly working order and i doubt it will last as long as the better alternatives.

 

If you're running an auto, that'll help, not as much "shock" as a manual. A TA Girdle/Stud kit will help strengthen it up. Upgrading to 28 spline axles and welding the tubes to the housing would also help.

 

Best way to make it handle 400hp is to not get on it too hard.

Some options would be to upgrade the posi to a 28spline unit, get 28 spline axles, diff cover with main cap supports.
That is about $500 or so in new parts that I'd rather use towards a 12bolt myself.

 

I've seen several built up 10 bolts work well into the 11s on 4th gens, so I followed the same recipe.

Started with a 2002 rear, 3.42 gears, and Auburn Pro diff. I welded the tubes, installed a solid crush sleeve, added LPW Racing's girdle and stud support, along with the tube brace kit. Should handle a good bit more power than stock

TRAXION - a board member here, is running mid 11s on nearly the same setup on his 1990 stock rear without any problems.

 

You guys need to have more faith in these rears. They can be made to "handle" more than you think. I have a buddy w/ a 355 LT1 Procharged P600 motor putting 480 to the wheels through a Turbo 400 tranny running on his basically stock 10 bolt. He has 3.73s and a SLP take out Zexel differential and thats it.

Couple things you can do to make them last longer is to put in a HD posi as mentioned before, weld the axle tubes, 28 spline axles, and add a solid pinion spacer. I wish I had put in the solid spacer instead of the crush sleeve when I put the 3.42s in my car. Oh yeah... A T/A girdle cover will help too. I put one in.

Don't sleep on the 7.5".

 

28-spline Moser axles
Torsen
Support cover

Has lasted over four years with no signs of failure.

 

Here ya go:

http://www.ws6transam.org/10bolt.html

 

The rears will last a lot longer with an automatic car, as long as no trans brake is used.

Buddy of mine went 11.1@120 in his 96 SS. The rear was all original except 3.73 gears. Stock cover, no welding of tubes, etc. That day he was cutting 1.5x. He did eventually break it on the next track day but it lasted 7 years.

As long as you don't abuse it, clutch dumps or trans brake, it'll last quite awhile. Mine lasted over 50K miles with 4.10 gears in my 96 WS6 6spd and that was with a lot of 1.7x launches.