HD 9.5" differential
- Thread starter bjowett
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gears
and how are you going to do this? How many? the 10.5 are on our to do list anyways. They wont do much good without the new fronts too though. And we already have gears in stock for the newer design 9.5"
and how are you going to do this? How many? the 10.5 are on our to do list anyways. They wont do much good without the new fronts too though. And we already have gears in stock for the newer design 9.5"
Josie'sLandCruiser
Stop calling it a "FJ."
Hi All:
I'd imagine the next weakness would be the actual axle tube. From what I've heard and seen pretty much any/all factory axle housings that are run with oversize tires needs to be re-inforced to prevent bending of the axle tube.
Regards,
Alan
I'd imagine the next weakness would be the actual axle tube. From what I've heard and seen pretty much any/all factory axle housings that are run with oversize tires needs to be re-inforced to prevent bending of the axle tube.
Regards,
Alan
Sorry for dredging up an older thread....
Carl, You say you have the gears in stock for the newer 9.5" are they the larger pinion diameter (1.28" 32 spline)?
BUMP for JTs.
there is gain in the ring gear mass, but the 27 spline pinion is the same as all old FJ fine spline. We need a 30 spline version pinion!
Scott
Now to see if the side gears can be done in 30 spline.
The TLC100-488-NG part number is the larger set, thicker offset, threaded r/g bolt design for use in 1998+ 9.5 rear. The pinion spline is 27 still as the flanges for this spline count are most readily available to fit them to more applications. This is already a very obscure application. Zero have failed, and if you break the pinion on these I am almost certain you have a ton of axle wrap or pinion is loose due to bunk setup. Though there are several in use in the US, most have gone to places that these rearends are more common like Russia, Australia, etc. There are several offroad competitors running them with HUGE tires, and lots of power. Here's an actual quote from down under:
"Hi Guys, Thought you might be interested in this. I just had a call from a customer who does tractor pulls with a Toyota 9.5” rear end and has been putting 1000hp through the rear and he reckons the Nitro gears are the only gears he has found that have been able to stand up to it.
Good stuff hey, Cheers"
The ring gear / pinion teeth on this design are also much larger than D60. So, yes maybe a 32 spline pinion might be "nice" its just not realistic given the small demand. It would however be a good selling feature as the more splines listed in a description the better it sounds I suppose.
"Hi Guys, Thought you might be interested in this. I just had a call from a customer who does tractor pulls with a Toyota 9.5” rear end and has been putting 1000hp through the rear and he reckons the Nitro gears are the only gears he has found that have been able to stand up to it.
Good stuff hey, Cheers"
The ring gear / pinion teeth on this design are also much larger than D60. So, yes maybe a 32 spline pinion might be "nice" its just not realistic given the small demand. It would however be a good selling feature as the more splines listed in a description the better it sounds I suppose.
Will you be doing them with the larger 1.28" 32 spline?
It would however be a good selling feature as the more splines listed in a description the better it sounds I suppose.
Of course it sounds better, because it is stronger. If the OPs pinion measurements are correct, FZJ80 1.1" vs. Tundra 1.28", that extra .180" is a big jump.
A .180" increase in diameter is huge in strength. For a solid shaft, given the same torque, length and material, the 1.1" shaft will twist 1.75 radians for every 1 radian that the larger 1.28" shaft would twist.
In more basic terms, the smaller 1.1" 27 spline pinion would twist 75% more than the 1.28" 32 spline pinion!
For those of you who want to do the calcs themselves:
Theta/alpha= TL over JG
Theta/Alpha = angle of twist
T= Torque
L= Length
J= pi D^4/32
G= modulus of elasticity
(My payback for helping my kid through mech eng school is free calculations!
)Two pinion gears, one FZJ80 4.10 1.1" 27 spline, the other is a 3.90 from a 07< Tundra 9.5", measures 1.28" with 32 splines.
Do you have pics of said pinions?
subscribed
Thanks Brian, much appreciated.
Do you happen to have any pics showing a side view?
Curious to see what the pinion shafts look like apart from the splines.
If it is bolt in, yes. If you go 35 spline and force a custom axle, why not just do a custom D60? or a 14b?
if it is a rear, there are off-the-shelf 35spine shafts from ?moser? to make it work. Some people like drop out rear ends and housings that can be welded to... 
From ARB: That locker set-up uses their "H" gearset, so you can go 30 spline Toyota, 30 Dana, 31 spline Ford, 32 spline Toyota (stock), 33 spline GM, & 35 spline Dana; so there are many options.
Built properly, a 300m 30 spline would take some substantial abuse, but as we saw with the numbers above, a bigger diameter is stronger; just going to the 31 spline Ford is a nice step up over the OE 30 spline.
However if you want to go with ultimate strength without changing housing ends, measure the ID of the spindle and upsize to the biggest diameter that will fit.
Built properly, a 300m 30 spline would take some substantial abuse, but as we saw with the numbers above, a bigger diameter is stronger; just going to the 31 spline Ford is a nice step up over the OE 30 spline.
However if you want to go with ultimate strength without changing housing ends, measure the ID of the spindle and upsize to the biggest diameter that will fit.