blairsj
Junior Member
- Joined
- Dec 23, 2023
- Posts
- 25
- Reaction score
- 4
- Location
- California
- First Name
- Steven
- Truck Year
- 1990
- Truck Model
- k5 Blazer
- Engine Size
- 5.7 Tbi v8
Is this a good pattern for gm 14 bolt ff?
- Thread starter blairsj
- Start date
Disclaimer: Links on this page pointing to Amazon, eBay and other sites may include affiliate code. If you click them and make a purchase, we may earn a small commission.
idrivea2002golf
Member
- Joined
- Feb 19, 2025
- Posts
- 42
- Reaction score
- 64
- Location
- San Diego
- First Name
- Spencer
- Truck Year
- 1981
- Truck Model
- C20
- Engine Size
- Not sure yet.
The pinion looks to be too deep. Compare your first image to the bottom right of this screen shot:
You must be registered for see images attach
Edelbrock
Full Access Member
- Joined
- Mar 28, 2025
- Posts
- 312
- Reaction score
- 297
- Location
- Earth
- First Name
- Grumba
- Truck Year
- 1977
- Truck Model
- K5 Blazer
- Engine Size
- 400
This might not be of any help to you:
One time I backed into a driveway, and when I tried to back out, the rear end locked up.
Could not go forward or backwards. Rear diff was ******.
Stranded? Nope, I dropped her into 4 low - trans in first, and then it was peddle to the metal.
Ain't no ****** up diff is gonna hold me back! Truck went down the road just fine. Just had to turn up the radio a little.
Little bits of metal on the road were like bread crumbs behind my rig.
When I rolled the axle out from under my truck, the diff sounded like a coffee can full of nuts and bolts rattling around.
True story.
One time I backed into a driveway, and when I tried to back out, the rear end locked up.
Could not go forward or backwards. Rear diff was ******.
Stranded? Nope, I dropped her into 4 low - trans in first, and then it was peddle to the metal.
Ain't no ****** up diff is gonna hold me back! Truck went down the road just fine. Just had to turn up the radio a little.
Little bits of metal on the road were like bread crumbs behind my rig.
When I rolled the axle out from under my truck, the diff sounded like a coffee can full of nuts and bolts rattling around.
True story.
- Joined
- Oct 27, 2016
- Posts
- 3,512
- Reaction score
- 10,253
- Location
- MO
- First Name
- Spencer
- Truck Year
- 1971, 1̶9̶7̶4, 1976, 1979,1̶9̶8̶5, 2002
- Truck Model
- Dart Swinger, Sierra 10, C10 Cheyenne, C10 Big Ten, Silverado 10, Ram 2500
- Engine Size
- 225/6, 350 c.i., 350 c.i., 5.9l Cummins
I agree, touch deep.
Add .004 shim to what you have right now and repattern. (Add in this scenario as the 14b ff uses a cartridge type pinion, if it were a say, 12 bolt, it would be remove shim)
What is your backlash? New gears correct?
Add .004 shim to what you have right now and repattern. (Add in this scenario as the 14b ff uses a cartridge type pinion, if it were a say, 12 bolt, it would be remove shim)
What is your backlash? New gears correct?
blairsj
Junior Member
- Joined
- Dec 23, 2023
- Posts
- 25
- Reaction score
- 4
- Location
- California
- First Name
- Steven
- Truck Year
- 1990
- Truck Model
- k5 Blazer
- Engine Size
- 5.7 Tbi v8
Okay thanks guys. Backlash is set at .006-.007 and this all gears and bearings.
blairsj
Junior Member
- Joined
- Dec 23, 2023
- Posts
- 25
- Reaction score
- 4
- Location
- California
- First Name
- Steven
- Truck Year
- 1990
- Truck Model
- k5 Blazer
- Engine Size
- 5.7 Tbi v8
blairsj
Junior Member
- Joined
- Dec 23, 2023
- Posts
- 25
- Reaction score
- 4
- Location
- California
- First Name
- Steven
- Truck Year
- 1990
- Truck Model
- k5 Blazer
- Engine Size
- 5.7 Tbi v8
Sorry yes new gears and bearings
idrivea2002golf
Member
- Joined
- Feb 19, 2025
- Posts
- 42
- Reaction score
- 64
- Location
- San Diego
- First Name
- Spencer
- Truck Year
- 1981
- Truck Model
- C20
- Engine Size
- Not sure yet.
I like it.
blairsj
Junior Member
- Joined
- Dec 23, 2023
- Posts
- 25
- Reaction score
- 4
- Location
- California
- First Name
- Steven
- Truck Year
- 1990
- Truck Model
- k5 Blazer
- Engine Size
- 5.7 Tbi v8
blairsj
Junior Member
- Joined
- Dec 23, 2023
- Posts
- 25
- Reaction score
- 4
- Location
- California
- First Name
- Steven
- Truck Year
- 1990
- Truck Model
- k5 Blazer
- Engine Size
- 5.7 Tbi v8
Just for context, I have a 1990 Chevy blazer with the stock V8 TBI350 700R4 trans and an NP 231 transfer case running 35 inch Tires. won’t be doing nothing crazy.
Bextreme04
Full Access Member
- Joined
- May 13, 2019
- Posts
- 4,558
- Reaction score
- 5,871
- Location
- Oregon
- First Name
- Eric
- Truck Year
- 1980
- Truck Model
- K25
- Engine Size
- 350-4bbl
Looks great to me. That's pretty much exactly what mine looked like when I rebuilt the rearend a few years ago. Factory 8600GVW K25 with 350/TH400/NP205, 4.10's, and 35's. I've towed and hunted in it for years since the rebuild and had zero issues. I added a grizzly locker at the same time as the rebuild.
