Also I found that I can only get a 410 gear for my rear where are you guys getting the 430 gear from also are you using the sock limited slip unit?

 

the 4.30's are made by motive gear and I got mine from summit. About stock clutches, my stock 5 speed clutch held 445rwhp 478rwtq for 10k miles with 3 trips to the track with slicks. It is now in my 95 383 truck and is soft in every way and drives like a dream. I'm confident the Ls7 clutch will do well if track use is occasional.

 

Turbo man your awesome so I can get motive to fit in my stock rear with no issues? I was told if I put a 4 series gear in a 3 series rear I need to put an Auborn in the rear as well?

 

I had 3.73's stock and then bought a tru-track and put the 3.73's back in. I then bought the 4.30's on it and set it up with all stock shims and it is quiet as a mouse. I highly recommend, but check the pattern and backlash to be sure. I ended up with .007" backlash with the 4.30's and motive gear called for .008-.010". I tried it and pattern looked pretty good so I went with it an it turned out fine.

 

So you had to put the aubourn in huh?

 

no. The 3.73's came off a stock diff and put them on a Detroit tru-trac and then the 4.30's worked on the detroit so I think you shouldn't have any problems with the 4.30's on the stock unit. I might do some research more if you don't have 3.73's or higher numerically, I don't think there is a different carrier for the 3.42's but I don't know for sure. The different carriers is an old school thing from what I can tell and have experience with but I can't gaurantee anything other than what i've said. interperet it as you will.

 

That is what I was told you are correct, I can not find a factory GM gear in a 430 thou only 410 or 456 and I am sure the 410 will be a waste of money?

 

It all depends on tire size. I have 31.5" tires and the first gear and 6th gear drivabilities are good but on the borderline. If you have any larger tire or smaller cubes i'd recommend a 4.56.

 

Isn't that just tooo much for a daily driver?

I have a 29 and a 31 inch tire on my trucks? It seems first would be useless.

 

First gear in the T56 is 2.62/2.66 i can't remember which but anyhow, they were built for a 26" tall tire on a car. A truck manual has a 3.82 first gear. With my current mods in my sig I cant spin a tire in first if I lay into it just after clutch engagement. It isn't useless, I would consider it almost perfect with my set-up. I use 5th gear while cruising unless i'm doing at least 70 then I will shift to 6th.