Hi all,

First post here. Sorry if this has been covered before, I have searched and cant really find the information i need.

A quick run down on my car -

Its a 92 Mazda RX7 FD with a twin turbo LS3 swap making around 700rwhp at 6psi (wastegate springs). I havent turned the boost controller up (or on!) yet so will be making a fair bit more once the weather gets better and i can do some more road tuning.

The car has what i believe to be a 92 Dodge Viper rear diff that has a modified casing to fit my car mated to a TR6060

It has had a bit of a whine after 70mph since i bought the car which was already LS swapped with the Viper Diff, i just made the twin turbo kit.

I haven't driven it much if at all especially with the turbo kit until the weekend just gone where i was doing a bit of tuning and did the first 2nd-4th gear runs.

After doing this the diff is now whining at even low speeds and just doesn't sound happy really. I changed the oil after i bought the car and it made no difference to it and its only done about 200miles since then.

What i am looking for is a rear gear that can hold 800-1000rwhp, it is mainly a street driven car so wont be seeing much drag action.

I am in the UK so i literally have no one to talk about upgrades, as Vipers are rare as rocking horse shit here!

Also i am currently at stock 3.07, is it worth going to 3.55 or better off staying with the 3.07 to help with wheel spin etc. I have attached two screen shots with the gear ratios.

3.07.PNG
3.55.PNG

Sorry for the long post!