97 6SPEED Z

I'm having a hard time finding anyone who makes 4.30 to 1 ratio ring and pinion sets for 2 series posi units for our stock 10 bolt rear ends. I can find 3.73, 4.10, and 4.56 ratio 2 series gear sets, but ...... NOT the 4.30 ratio gears.

Anyone know, or have a link to whoever has 4.30 ratio 2 series ring and pinion sets?

TIA for all replies!

FirstYrLS1Z

I work on our 'little' rears and have never seen a 4.30 2 series 'thick' gearset. Even 4.30 3 series gearsets are not that common.
If you're gonna use 4.30s',you're gonna have to pick up a 3 series carrier.

IF you do find a 4.30 2 series gearset,let me know who from.

97 6SPEED Z

To the top after .......... almost 5 years!

Anyone ever find 4.30:1 ratio "thick" gear sets for our 2 series 10 bolts?

FirstYrLS1Z

NO !!!
You can use a 'regular'(not thick) 4.30 gear set on a 2 series carrier with a 'ring gear spacer' but spacers are not recommended as then you have 2 mating surfaces in which one or two of the contact surfaces could shift thereby throwing out your lash setting.

Why a 4.30 ? what would that accomplish that a 4.10 wouldn't ?

97 6SPEED Z

Make the car more drivable in both fifth (5th) and sixth (6th) gear.

I've had 4.10's in the car before, and ........ it's just not enough gear to make 5th and 6th usable on the street.

If the 4.30's are still not available ..... I'll just go with the 4.56's.

FirstYrLS1Z

How did you get a 2 series carrier with your 6 speed or was it converted from automatic ?
Richmond is the only one I know that has got a 4.56 for 2 series.

97 6SPEED Z

My six (6) speed Z, (like all the '97 manual trans Z's), started out with the 3 series carrier and a set of 3.42 gears. After some heavy street and dragstrip abuse, the 3 series Auburn limited slip differential that came stock with the '97 Z's ..... became "peg legged" as we say. (i.e. the Auburn LSD failed, and the car would only do .... one (1) wheel peels.)

At that time I got a "smoking" deal on a set of 4.10 gears and an "upgraded" Torsen LSD from a "low mileage" LS1 era F-Body. Unfortunately the Torsen LSD was a 2 series carrier, and came with a "thick" 4.10 gear set.

Thanks for the tip on the Richmond 4.56 "thick" gear set, which I also found on eBay, and several other places.

From your experience with the 7.5/7.625" 10 bolt Torsen diffs, do you know how much more the paddle has to be ground for the 4.56 gear set, over the 4.10's???

FirstYrLS1Z

this is a thread with paddle ground for 4.10 3 series and 3 series carrier,2 series SHOULD be the same. For a 4.56 with a paddle,I don't know how much more grinding is required.

modifying a 'torsen' paddle-pics - LS1TECH

The 4.56s' I used were with a 3 series Eaton and there I ground the gears for pin clearance.


the grinding of the gears had no bad effect as it was not in the contact area.

97 6SPEED Z

FirstYrLS1Z:

Thanks! .... for the info.