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14 Bolt Ring Gear Bolts (Long Vs. Short) for 4.56 Thick Gears and 4.10 & Down Carrier?

Sean

Sean

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Feb 9, 2023
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Can't seem to get a straight answer from the drivetrain warehouse sales people. Searched here and read the Billa Vista article on 14B set up and he mentions the 2 sizes (longer ring gear bolts for 4.56 and lower gears...which all the footnotes mention). However, what I'm trying to find out is: What dictates the necessity of the longer bolts? Is it the 4.56 and up carrier or the 4.56 and up gear itself?

The reason I ask is I'm goin 40 spline ARB which only comes in a 4.10 and down carrier. You use a thick 4.56 and up gear on that carrier.

So which bolts do I need? The shorter ones that occasionally come in the better master install kits (at substantial cost savings) or the longer bolts which run anywhere from $6.45 a bolt (need 24 total to do both axles) to $12 each depending on where you get them? Trying to be a cheap ass here and avoid buying $155 in specialized bolts if I don't need to.

TIA.
 
total newb said:
Btw, if you buy a MASTER install kit it should come with bolts.
Click to expand...
Unfortunately, with the 14B...they often don't. Weird, b/c every other Master Install I've ever seen does.
 
With koyo bearings
IMG_4498.png


With timkin bearings
IMG_4499.png
 
Yep...DTA was the only place i found that was selling their kits with the short bolts. They also have these with Timkens for about the same price.

www.drivetrainamerica.com

DRK325AMK GM 10.5 14 Bolt Master Timken Differential Bearing Kit

DRK325AMK GM 10.5 14 Bolt Master Timken Differential Bearing Kit DT Components® light duty rebuild kits are marketed by The Timken Company. Our light duty kit offering includes differential rebuild kits in four different styles and accommodate the following makes: AMC/Eagle, Jeep...
www.drivetrainamerica.com www.drivetrainamerica.com

1727105383573.png
 
I used shoulder bolts from McMaster Carr sucessfully as short ones were a pain to get.
Both diffs are still in my buggy without issues.
 
1727105439695.png

If you'll notice at the bottom....the mention the RGB9 (short bolts) and the need to order the longer ones for 4.56 and higher gears at $8.57 each.

www.drivetrainamerica.com

YSPBLT-020 GM 10.5" Ring Gear Bolt Long 4.56 Ratio And Higher

YSPBLT-020 GM 10.5" Ring Gear Bolt Long 4.56 Ratio And Higher<br /> 12479387, 331421, 40019659, RGB10 -- •Ring gear bolt for GM 10.5" 14 bolt truck •4.56 and up ratio •1/2" x 18 thread •2.522" overall length Yukon Gear & Axle manufactures a full line of top quality small parts to complete...
www.drivetrainamerica.com www.drivetrainamerica.com
 
Bebop said:
I used shoulder bolts from McMaster Carr sucessfully as short ones were a pain to get.
Both diffs are still in my buggy without issues.
Click to expand...

My understanding is the lengths are the issue...I've seen numbers all over the place, but they aren't standard 2.25 or 2.5" from what I've read.
 
Sean said:
My understanding is the lengths are the issue...I've seen numbers all over the place, but they aren't standard 2.25 or 2.5" from what I've read.
Click to expand...
That's what the cutoff wheel is for.
Honestly, I was broke when I did that, and they aren't properly shanked as well.
But despite all of this, they haven't moved and are doing their job. Also broke a couple of Detroit lockers and a rear 14 bolt shafts with those bolts.
 
Depth of gear teeth will determine how much bolt they could get in there. Ring gear mounting face to root of gear teeth, subtract for material safe.

Measure the thread depth, add the thickness of the diff case flange and purchase accordingly.
 
FlatLander said:
Depth of gear teeth will determine how much bolt they could get in there. Ring gear mounting face to root of gear teeth, subtract for material safe.

Measure the thread depth, add the thickness of the diff case flange and purchase accordingly.
Click to expand...
I don't have the parts to measure and am trying to order the right parts the first time so I don't end up paying for multiple shipments.
 
Went back and read OP... Being that the 14 Bolt ARBs use a thicker flange, my assumption would be that the longer bolts would be needed. Also, are using thick gears should be a deeper bolt hole. What are the two thread lengths in question?
 
Getting varied answers on that depending on what site you go to and what master install kit is being discussed. I've seen a 2.82" length bandied about....but have seen stuff just over 2 1/4 and 2.5" as well. But oddball length so buying common hardware would necessitate a cut down. This thread pretty much has me resolved to buy a Master Install...then just place another order for bolts once I can measure it all out.
 
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