I have a 2 piece shaft that has seen 130+ mph on a reg basis. The single shafts are the ones with the problems.

 

Got a before and after speedo shot??

 

I wish i did. I tell myself to do it b4 every mod but always forget lol.

 

IF its the ALUM DS then be careful.
ill have to sit down and figure up the DS Rpm vs MPH.. but i know the stock 2 peice steel is good up to 160mph
which = 6700rpm DS speed

 

Whats your highway rpm now compared to before?

 

At 70 b4 Rpms were just a sorry 1800 and couldn't hold over drive for nothing on the smallest hill, now the Rpms are at 2200 and can hold over drive like no other.

 

Man...that makes me wanna change my gears to 4.30s, i have some wide *** 33s and my truck is slow as *****. Guess I need to stop beating around the bush and order the rest of my crap for the blower install ha...I just know my tranny is gonna take a **** soon after

 

What has happened to your mileage?

 

Im interested in what mileage is doing too, I have wide *** 33s on my truck with 3:73 and was told to do 4:30s so highway mileage wouldn't suffer as much either.

 

I dont figure MPGs cause i really dont want to know them, but my DIC was telling me 11.9 and after swap it say 12.1 Highway my computer tells me im getting 15 at 70 which it use to be around 13-14. Like i said i really dont wanna now MPGs lol.