Hello everyone!
I'm looking at rebuilding the stock rearend in my 70 cougar. The car currently has 3.0 Open gears with 28-spline axles. I've recently put a new motor in the car thats pushing close to 500 hp/ft-lbs at the flywheel, likely somewhere around 400 at the differential. I have a new set of 3.7 gears to toss in, and was thinking I might want to upgrade to 31 spline axles and a posi of some type while I'm in there. The rub of it is I've never done any rear end work before and I find it a bit daunting. There are different bearing sizes, different carrier bearings, etc and I don't even know where to start to find this information so I have the right parts before I even get off the ground. It is an Eliminator, so I dont really want to modify the housing. Some general questions:
1) At 400 ft-lbs, will the stock 28-splines take the power reliably or should I upgrade to 31 spline axles?
2) Will 31-spline axles fit where 28-spline axles do currently or do they require a larger bearing?
3) what am I not smart enough to consider that I should be when doing a rear end rebuild?
Thanks!
I'm looking at rebuilding the stock rearend in my 70 cougar. The car currently has 3.0 Open gears with 28-spline axles. I've recently put a new motor in the car thats pushing close to 500 hp/ft-lbs at the flywheel, likely somewhere around 400 at the differential. I have a new set of 3.7 gears to toss in, and was thinking I might want to upgrade to 31 spline axles and a posi of some type while I'm in there. The rub of it is I've never done any rear end work before and I find it a bit daunting. There are different bearing sizes, different carrier bearings, etc and I don't even know where to start to find this information so I have the right parts before I even get off the ground. It is an Eliminator, so I dont really want to modify the housing. Some general questions:
1) At 400 ft-lbs, will the stock 28-splines take the power reliably or should I upgrade to 31 spline axles?
2) Will 31-spline axles fit where 28-spline axles do currently or do they require a larger bearing?
3) what am I not smart enough to consider that I should be when doing a rear end rebuild?
Thanks!