The axle arrived minutes ago! The owner of G and R, Greg, was very helpful, and apologetic for their mistake...he has gone out of his way in regard to communication and in expediting the shipment.

As for the gears and differential, it does have the Gov-Loc in it with 3.42 ratio gears...which is what my oem gearing was. I was happy the ratio when the Yukon was my DD, but changed to the 3.90 when I did the Auburn LSD thinking it would give me the best of both worlds--decent RPM at freeway speeds (around 2100 at 70mph, IIRC) as well as good launches and a good RPM at the traps. The trap RPM was not exactly where I wanted it but figured that I would dial that in with drag radial diameter once I had optimized the horsepower.

I'm curious as to how tough the 9.5" 14-bolt Gov-Loc is and think that I will run that with the 3.42 gears until it either gives out or my "cash cow" starts giving milk again--at which point I'll swap to a TrueTrac and lower gearing. Gear options are much more limited than the 10-bolt, with 3.73 & 4.10 being my "reasonable" alternatives. I will likely go with the 4.10...3.73 is too small of a change to make it worth while.

 

glad it all worked out.

3.73's are whats in mine and you are right 4.10's should make a better fit,highway speed rpm's will be high though...

Still watching!

 

Thanks. Turns out oem GM gears are 4.11 and with 26" will give me a 113 mph at 6000 rpm, and 121 mph with a 28" tire. Either should serve me well.

Now just need to bolt it in...

 

keep me posted,you are the lead dog on this one and will be looking for advise and best solutions if any,finaly have a solid line on one locally, pic's on the way and hopefully rear to follow soon enough

you see my 12 sec vid?

 

So it has the 4.10/4.11 gear in it instead of the 3.42? If so that's really cool. The 9.5" Gov-Lock is fairly tough due to it's size. As long as you're carefull with it that thing should outlast your Auburn in the 10 bolt. If you are at the track make 100% sure that both tires are in the water before you start the burnout and if one side happens to unlock at any time while they are spinning, let up right away. That is a big killer to a Gov-Lock.

 

Waiting to see how install goes.

 

Not yet, but I'll search your posts and check it out! I wish that I would've had a vidcam on my last outing, but only had the still pics to show.

No 4.11; has a 3.42 gears, or so I was told. G and R didn't have a GT5 axle available at the time. A couple other yards had them but they were at least another $400 more and I already emptied the bank on the 383. So I'll just have to wait til I can afford another $1500 for 4.11 gears and Truetrac install.

 

As previously mentioned, the 9.5" 14-bolt has a 1350 yoke. It requires different u-joint straps: part number GM 3920486.

Bolts (4 req) are part number GM 14018700.

Fortunately, my local dealer has them on the shelf.

 

thanks, just awaiting pic's of the one i found local it also has the 3.42's

 

Hi guys...time for an update.

First, let me state that the 9.5" 14-bolt that I received was reported to be from a 2007 Escalade ESV, and I have no reason to believe otherwise. However, I did not see the vehicle it came from and have no way to verify this.

The complete axle was a direct bolt in to my 2001 Yukon. All mechanical mounting points for trailing arms, panhard rod, coil spring perches, etc. fit perfectly. The only issue that I have requiring fabrication is the brake lines have different size fittings and the 2001 emergency brake cable bracket does not work with the newer design.

New custom brake lines should be here in 3-days, and were working on a good bracket design to fab up.

These are small items and I'm very pleased with the fact that I didn't have to fab anything on the mounting.