Other Gear Questions
10-30-2010, 10:21 AM
#1
TECH Apprentice
Thread Starter
Join Date: Dec 2008
Location: CAYMAN ISLANDS
Posts: 308
Likes: 0
Received 0 Likes
on
0 Posts
Other Gear Questions
I have ordered two sets (front and rear) of 4.11s from Randy's Ring and Pinion. I also posted a note with the online order that it was for an 08 AWD GMC Sierra Denali, and asked them to ensure that the gears would fit my truck. It appears that order has been shipped (althogh I haven't rec'd a tracking #).
However, I've now noticed on the order confirmation that the gears for the front appear to be reverse rotation and so I'm worried that they aren't the right gears for the GMT900 AWD, since I don't see anyone on here referring to a reverse roation gearset! The reason I'm worried is that they are charging me $326.00! for UPS shippping (from their Washington state location!) and I'll have to pay import tax on top of that as well, before I can confirm for myself if these gears can work! Can anyone on here say what the deal is with the AWD front gears? Are they Reverse Rotation or not? Any input would be appreciated.
These online gear vendors are really FOS. I've been looking for months to try to find any useful info on what gears to use in my truck, to no avail.
However, I've now noticed on the order confirmation that the gears for the front appear to be reverse rotation and so I'm worried that they aren't the right gears for the GMT900 AWD, since I don't see anyone on here referring to a reverse roation gearset! The reason I'm worried is that they are charging me $326.00! for UPS shippping (from their Washington state location!) and I'll have to pay import tax on top of that as well, before I can confirm for myself if these gears can work! Can anyone on here say what the deal is with the AWD front gears? Are they Reverse Rotation or not? Any input would be appreciated.
These online gear vendors are really FOS. I've been looking for months to try to find any useful info on what gears to use in my truck, to no avail.
10-30-2010, 10:26 AM
#2
TECH Apprentice
Thread Starter
Join Date: Dec 2008
Location: CAYMAN ISLANDS
Posts: 308
Likes: 0
Received 0 Likes
on
0 Posts
Also, the rear gear set has "ABS" on the Order as well? Don't know what that means unless it has like reluctor slots cut on the outside of the ring gear for the ABS sensor???
Last edited by CI DENALI; 10-31-2010 at 02:14 AM.
10-31-2010, 02:14 AM
#3
TECH Apprentice
Thread Starter
Join Date: Dec 2008
Location: CAYMAN ISLANDS
Posts: 308
Likes: 0
Received 0 Likes
on
0 Posts
Here's a copy of the order confirmation:
GM 8.25-411 $396.24
8.25IFS GM 4.11 REV R&P (OEM) (2009&Older-See_Notes)
GM 8.5-411-ABS $337.08
8.5" GM 4.10 R&P(with ABS) 2-STEP - FACE TO FLANK SET-UP ONLY!! OEM
Can anyone confirm that these will fit my truck?
What the hell does "2-Step - face to Flank set-up only" mean?????
GM 8.25-411 $396.24
8.25IFS GM 4.11 REV R&P (OEM) (2009&Older-See_Notes)
GM 8.5-411-ABS $337.08
8.5" GM 4.10 R&P(with ABS) 2-STEP - FACE TO FLANK SET-UP ONLY!! OEM
Can anyone confirm that these will fit my truck?
What the hell does "2-Step - face to Flank set-up only" mean?????
11-04-2010, 07:05 AM
#4
TECH Apprentice
Thread Starter
Join Date: Dec 2008
Location: CAYMAN ISLANDS
Posts: 308
Likes: 0
Received 0 Likes
on
0 Posts
Got the gears. They are in fact 4.10s, made by AAM. I don't see anything special about the rear set, so I'm still not sure wth "face to flank set-up only" means? Randy confirmed in writing that they will work. I'm going to start on installing them today.
11-06-2010, 08:33 AM
#7
TECH Apprentice
Thread Starter
Join Date: Dec 2008
Location: CAYMAN ISLANDS
Posts: 308
Likes: 0
Received 0 Likes
on
0 Posts
Got both gear sets in and they went in beautifully. Didn't need to change shims or reset backlash, bolted the gears in and checked backlash and painted the gears and checked the tooth contact pattern and they meshed perfectly. Drove it around last night. No noise/whine or anything from either diff. Well worth the extra cost of buying the AAM brand OEM gearsets.
The truck is now brutal on acceleration too. And much more driveable - no more hunting, lugging. Wish I had done this change long ago.
Going to take it to the track this evening to see what the difference in ET is.
The truck is now brutal on acceleration too. And much more driveable - no more hunting, lugging. Wish I had done this change long ago.
Going to take it to the track this evening to see what the difference in ET is.
Trending Topics
11-06-2010, 01:01 PM
#9
Let us know how big the change is!
What did your pattern look like? When I installed mine, it ended up running off the toe a little bit. A .005" shim swap pushed the pattern way closer to the heel, so I moved it back to the toe. Yours similar to that?
What did your pattern look like? When I installed mine, it ended up running off the toe a little bit. A .005" shim swap pushed the pattern way closer to the heel, so I moved it back to the toe. Yours similar to that?
