I have an opportunity to pickup a 10 bolt disc brake rear end with some upgrades. Has 411 gears, auburn posi, boxed control arms, aftermarket panhard bar, spicer axles. All for $350.

I have a 1999 350 bottom end with 305 heads and TBI. So higher compression.

For tranny I have a WC T5

My question is does anyone have a similar setup and if so how do you like it?

I'm trying to figure out if the RPM range on the highway, and just overall if this is a good idea?

Thanks ahead of time for your info and opinions!

 

Well I went with the rear end swap and am very happy with the rear disc brakes and low end performance of the 4:11's. Posi is a nice change of pace also...

So... Assuming my tach is accurate, at 60 MPH I sit right at 3500 RPM.

That is a little uncomfortable and seems to run out of steam not far after that.

I thought with the 5th gear I might be ok, but not so sure anymore...

Still wondering if anyone is running a similar setup and what they think about it?

Or other opinions welcome...

Thanks!

 

There are calculators you can find online to figure out things like cruising RPM and things like that. Here is a link to one I used:

http://www.powerblocktv.com/resources/

So assuming you are running stock size tires, which are about 25.65 inches tall, you shouldn't be turning anywhere near 3500 RPM. Depending on which 5th gear you have, T-5's could be .75 or .63, I believe .63 is more common, you should be closer to 2000-2500 RPM at 60.

 

I have 4:56 with a 30" tall tire and at 70MPH the tach showed about 2200 rpm. I have been happy with this setup