I was curious, does anyone make just the 4.10 Gears for a Z06/Grand Sport? I have a local installer that is good at doing a gear swap in Corvettes, but not sure we can get the gears. Anyone have any suggestions?

My other option is just watching the classifieds for a used RPM differential for the Z06/GS with 4.10's already in it... so if anyone happens to have one of those available I'm all ears :-).

Thanks!

 

Mind if I ask why you want 4.10 gears?

 

Sound like you have the answer, call RPM for the gears.

That is what I did.

 

I'm wanting to make 2nd gear more useful for the driving that I do. I've had gears changed out in one of my past cars and really enjoyed the SOTP difference it makes.

 

That's definitely something I'm thinking about. If I could find a less expensive alternative that would've been great.

 

Their gear prices are competitive. I shopped when I bought mine and they were the same price as others.

 

no one makes any gears for the Z06 differential.only gear available is the factory 3.42. the aftermarket gears others are using are for the base differentials and are physically smaller than the Z06.these gears can be installed along with all the smaller and less durable base parts into the Z06 case

 

Ah, I assume you don't have Z06. Traction would become a serious issue with 4.10 gears. I have the factory 3.42's and I can barely hook in 2nd and sometimes the back ends gets lose in 3rd. 4.10's would make my Z06 useless until 4th gear.

Anyhow, thanks for answering my question.

 

Best option is to go with a complete differential rebuild. Just swap diff's.

RPM is one and another is the old DTE which is now Hoosier. Both are sponsors.

I went with DTE stage 2 6 years ago and worry free. 4:10's mated to the LS3.

Transforms the driving experience.

I was at 422 both rwhp and tq, just 20-25 shy of the Z06 stock power and with proper tires traction was not a concern.

Popping the clutch is idiotic and will cause tire spin though.

 

You can get various upgrades such as 300M shafts, Eaton center section, etc.

Both RPM Transmissions and RKT56 can provide this service.

 

Hey Gary!

We have a RPM level 3 diff (with 2,500 miles) with 4.10's for sale. It will have new set of 4.10's with 30 spline. PM me for details.



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^^^^ Rick is a great guy and knows his stuff.^^^

 

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Hey Rick,
I have a rental at Atco on 4/22 if you and any of your buddies wish to make it out to Jersey.

 

Talked to Rick yesterday, great to talk to and yep sounds like he really knows his stuff. Can't wait to get my "new" Dif in. :-)

Sorry, but another question, is there a good "how to" in replacing the differential on a Grand Sport / Z06? At this point I will have someone who is much much more knowledgeable than me help put it in, but I do like to have an idea beforehand of what the steps are to do it. I've been trying to search, but didn't come across a great write up.

Thanks,

Michael

 

I do not have any good tips except to take your time. It is much easier on a lift as you can imagine. Be careful not to lose the washers in the upper control arms. Hopefully a good technician can chime in. Good luck. Those 4.10s will surely wake your ride up.

 

Can I ask what a proper diff with a 3.90 gear or 4.11 gear ratio typically cost?

 

I don't have a Z06 diff, and have 3:73 gears with a Quaife, hardened output shafts, big pinion bearing, cooler and all new parts including the case and I have $5,000 in it. I may have spend to much, but I got what I wanted.

 

My recondition case with new parts as needed and upgrades including carbon clutch packs and redesigned oiling system with cold treated ring and pinion gears and hardened output shafts was $1895 some 6 years ago. That was not including labor for removal or install.

I recall the whole bill was $2400 installed.

Stage 2 street from the old DTE Engineering now Hoosier.

Basically a new diff and the case is gone over for cracks etc as is any other component not upgraded looking for wear.

 

I most likely can't make it but currently trying to finish my orange car so I'll be at MIR.

Call me after you receive the differential and I can go over with you regarding the installation.

We sell them for $3,000 plus core charge.

 

Highly recommend Rick, great service and always available for questions