Just bought an 85 camaro for my first project car!

[0guagepa]

I just read somewhere that the new camaro's have a 28 spline and mine has a 26 spline so if i replace the rear end with a posi rear from a newer camaro i would have to replace the axles too. I am a complete noob when it comes to rear ends so any help here is much apreciated....

[89IROC&RS]

yeah everything before 1989 had 26 spline, 1989 and later has the 28 spline. im not sure but so long as you get the axles from the same application (ie drums to drums or disks to disks) you shouldnt have a problem, stick to the axles out of a 1989 to 1992 and the carrier out of a fourth gen, i would say the newer the better, but i got mine out of a 1996 firebird. with those parts, you should be able to just bolt it all together.

[drvngstorm05]

it might be smarter to put an entire posi third member on ur car. they have instructions and advice on that swap all over. i plan on doin that at least, not to mention i've heard it give your car an aggressive stance because the posi third member is 2 inches wider (or was it 2in per side, i don't remember).

[89IROC&RS]

??? to my knowledge, the rear end housing is the same. the difference is inside, in the carrier. i have an open rear in my RS, and a posi carrer will bolt right in, far easier in my opinion to put in a carrier, rather than replace the whole rear end assembly.

[89IROC&RS]

or are you talking about a 12 bolt vs a 10 bolt??? a 12 bolt is larger, but 10 bolts are the same in all camaros. no difference between posi and open from the outside. just a differnt carrier.

[0guagepa]

Ok, i just found a 10 bolt posi 26 spline on e-bay.....that would be much easier and cheaper than then replacing the axles too not to mention having to find another camaro to pull parts from. also ive been looking a gears too....what would be the advantage and/or dissadvantage of putting 4.10 gears in it?

[89IROC&RS]

so its just a posi carrier?? not the outter housing, axles, brakes and everything. then yes, i would say that would be the easiest way to go. and cheaper. also look at the ring gear size. the one in your camaro should be 7.5 or 7.625 in in size, make sure that the posi you are looking at is not a 8.5in ring gear. the smaller one was used in camaros and passenger cars, the 8.5 is used in the buick GN's and light duty trucks. the internals are not interchangeable. as far as the 4.10 gears, advantage, hellacious acceleration, just plain fast. digs in and goes. down side, youll have to wear ear plugs, and have one helluva cooling system to run it as a daily driver, cruising speed will be like 3000-4000rpm i would estamate. gas mileage will suck, i wuold reccomend going no higher than 3.73, preferably 3.42 or 3.23. if you have no overdrive the 3.23 is best, 3.42 is optional, 3.73 is pushing it. with the overdrive, i would say you could pull the 3.42 very comferateably, and 3.73's would be doable. but for a daily driver, i would never recomend the4.10, although im sure someone on here is gonna say im a wuss for saying so.

[0guagepa]

i do have overdrive and i already get terrible gas milage anyway...lol but the 3.42 or 3.73 might be more to what i need cuz this will be driven every day!!

[89IROC&RS]

yeah, when it comes to a daily driver, less is more. i would highly reccomend the 3.42 gears.

[kd5icr]

I know this a old post but I was blown away by the guy that was talking about grinding a cam with a .600 lift. So let me get this straight, you would do all of that, let him put it in his engine, then walk away? How about telling the guy that when you get into high lift cams you change the geomitry of the valve train, and that he will have to change rocker ratio and get shorter pushrods. If you know how to grind cams you need to give up more detail than here is what I can get you and it will do this and that and on and on. These is a lot more to this than just shoving a cam into an engine. For 5000 dollars this guy could get a LT1 with a harness stroke it to a 383 with a hot cam,and put a nos system in it and have beer money when he is done. the LT1 is a roller engine so thats done. Come on we can all rattle off parts all day long but the trick is to do it right. I am not saying that this guy doesnt know what he is talking about but he left out a LOT of info.