As the title states, I am throwing the idea of swapping out my 3.42's with 4.10's. I currently have a 14' 6.2 4x4, TVS2300, LT headers and of course tuned. Tires are not oversized, 305/50/20's on stock High Country wheels and no suspension lift, just a rear 3inch drop. The questions I have are:
1) With a 4 wheel drive launch, do you think I am much more likely to break other drivetrain components with the lower gear set up?
2) Are there any down sides that you guys could possibly think of that I might be over looking?
Any and all opinions/comments, PROS and CONS, are appreciated! I don't want to pull the trigger and drop the truck off without knowing any and all possible ill effects I might encounter by doing the swap.

 

No one makes 4.10's for the 9.76 rear yet without doing that hodge podge retrofit BS with old style 14 bolt stuff. You can get a 4.10 for the 9.5 rear though that fits these new 12 bolts properly. Where are you located? based on your location I have a 9.5 I would swap with you to do the 4.10 swap.

RT

 

The performance shop that I use has located everything I need for the swap. Here is a screen shot of the parts list.

I'm located near El Paso, Texas.

 

Hmm.... I'm not seeing any other ratios for the 9.76 other than the 3.23, 3.42, 3.73's any where. I don't know but good luck though it ought to be a screamer with 4.10's!

RT

 

I will contact my builder and try and get all the info for you if you are interested.

 

Yes I am... Thanks Gear brand part numbers would be great.

RT

 

Here is the ring and pinion in 4.10 ratio the GM 9.76.
http://eastcoastgearsupply.com/i-23887031

 

But still using a Gov Bomb....... sigh...... lol. They don't make a carrier for the 9.76".. and I guarantee they never will either unless the diff's use is more widespread. Better off buying a 9.5" that you can put some parts in....

 

Gov bomb? Sorry, I'm not to current on interwebz lingo. Lol

 

The Gov Lock.... being the POS locker GM installs in the rear end from the factory. RPO code G80....