exchangeable 4.10 ultimate struss kit how to?

[camarojunky74]

okay here is my question i got a 99 ss with an auto so i have 3.23 gears, but i got this rear end from my friend with 4.10 a ultimate struss kit, and upgraded axles and an auburn carrier, i just want to know if i put this in what will be my rpms at 80? and will i have to get a tuner to get the speedo to be right? or will my abs light go on?
i wanna put this whole rear end in soon , but dont wanna buy a tuner right know if thats the case.

[slims00ls1z28]

80 will be close to 3k. I have 4.11's in mine and I spin about 2800 at 77 MPH. Speedo will be way off until you tune it mine reads 118 at 77 MPH. My ABS light isn't on but the brake light comes on from time to time. At least you have an SS with the 17" rims and no top speed limiter. My limiter is at 118 MPH and according to the GPS when my car goes into fuel cutoff I'm only doing 77

[camarojunky74]

i actually have 18's but yeah thats not to bad that will only be a 500 rpm increase