Toyota gear driven transfer case - 21/23 spline ?

frankenyoter

frankenyoter

No Rain, No Rainbow
Joined
Mar 17, 2009
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Are the outputs to the drive flanges all the same and the spline count is only on the input? I think that’s the case but figured I ask the professionals. It’s been a while since I have been down this road.

So if I’m going to get a 23 spline 4.7 kit, I can start with a 21 spline cases, correct?
 
this might help, I think the turbo case was the only one to have a factory 23 spline to mate up with the R150F. yes, you can swap a 21 to a 23



www.marlincrawler.com

Marlin Crawler’s Transfer Case Bible

This is the ORIGINAL Gear Drive Transfer Case Bible created by Marlin Crawler back in the 90s. All styles are a 2-speed plus neutral design, with a 1.00:1 high range and a 2.28:1 low range.
www.marlincrawler.com www.marlincrawler.com
 
You can do 23 spline in the second case if you do duals, but the one that mates to the tranny has to match the output on the trans. 4 cyl Turbo trans (R151F) is is the only one that was 23 spline that a gear drive case will bolt to.
The v6 trannys (R150F) wont accept a gear drive case without an adapter.
 
fourtrax said:
this might help, I think the turbo case was the only one to have a factory 23 spline yes, you can swap a 21 to a 23



www.marlincrawler.com

Marlin Crawler’s Transfer Case Bible

This is the ORIGINAL Gear Drive Transfer Case Bible created by Marlin Crawler back in the 90s. All styles are a 2-speed plus neutral design, with a 1.00:1 high range and a 2.28:1 low range.
www.marlincrawler.com www.marlincrawler.com
Click to expand...
That’s the info I needed as far as outputs.
lbyota85 said:
You can do 23 spline in the second case if you do duals, but the one that mates to the tranny has to match the output on the trans. 4 cyl Turbo trans (R151F) is is the only one that was 23 spline that a gear drive case will bolt to.
The v6 trannys (R150F) wont accept a gear drive case without an adapter.
Click to expand...
my pile is adapted and dualed already. 23 spline r150f and a 3.4.

Wanting to build the 4.7 case.

OR, since I’m whacked in the head I have considered triple stock cases. Triple cases with a 4.7 would be best suited for west coast.
 
@frankenyoter I've been down this road, trust me, just go to a 4spd atlas. We can talk about it and what i ran into along the way and why I say go the atlas route vs the toy.
 
Meh, I broke plenty of the marlin competition 4.7 gear sets. The failures always occurred within the low range gear and idler gear interface. Case flex can be a factor, but it’s mostly shock load on the gears that leads to failure. The bigger outputs are solid, and having the beefier AA case/housing helps. Deep axle gears will reduce stress on the tcase gears too. But honestly, I rebuilt my 4.7 case so many times that if I had to do it all over, I’d bite the bullet and replace dual Toyota cases with a 4 speed atlas.
 
I just can’t justify 4k on an atlas when there are other more adult things I could put the funds towards. Same reason I’m sitting on super duty axles and doing nothing. Rough math puts that at 8k on the cheap. With a 14 yr old under the roof, that’s first car sums as opposed to the off chance I get to go wheeling.

Maybe I’ll just leave the thing alone.

Trying to grow up and be responsible in later 40s sucks rotten ass.
 
frankenyoter said:
I just can’t justify 4k on an atlas when there are other more adult things I could put the funds towards. Same reason I’m sitting on super duty axles and doing nothing. Rough math puts that at 8k on the cheap. With a 14 yr old under the roof, that’s first car sums as opposed to the off chance I get to go wheeling.

Maybe I’ll just leave the thing alone.

Trying to grow up and be responsible in later 40s sucks rotten ass.
Click to expand...
Do what ya can and let’s go wheeling lol 😂
 
frankenyoter said:
I just can’t justify 4k on an atlas when there are other more adult things I could put the funds towards. Same reason I’m sitting on super duty axles and doing nothing. Rough math puts that at 8k on the cheap. With a 14 yr old under the roof, that’s first car sums as opposed to the off chance I get to go wheeling.

Maybe I’ll just leave the thing alone.

Trying to grow up and be responsible in later 40s sucks rotten ass.
Click to expand...
Then just leave the duals as they are. I wheeled for awhile with duals behind the 3.4/5spd and the sticky 42s.
 
frankenyoter said:
That’s the info I needed as far as outputs.

my pile is adapted and dualed already. 23 spline r150f and a 3.4.

Wanting to build the 4.7 case.

OR, since I’m whacked in the head I have considered triple stock cases. Triple cases with a 4.7 would be best suited for west coast.
Click to expand...
Here's a sneak peek at @frankenyoter next spring 😘
FB_IMG_1736940619121.jpg
 
I typed a complete novel with a plot and everything this morning bc adderall is fully kicked in. Then realised nobody got time for that, so I deleted and started over. The TLDNR version is as follows:

The type of driveline gearing your talking about would be useful on the left cost. Not as much here. Sounds like you already have enough gearing for the right coast. I would focus on strength of existing driveline componets to handle your buddy yelling "hit it with your purse, you pu$$y!"

The amount of driveline strength you need will depend on your rig's specs and your ability to resist the temptation to put your right foot through the firewall. I promise you, that 5VZE has more than enough power to kersplode even the strongest Toyota gear driven transfer case that money can buy. If you are a sensible driver, and are okay with the idea that you will occassionally ruin a wheelin trip and have to rebuild your toyota case(s), then run what you brung. They are cheap and easy enough to find/rebuild. Hell, that's why everyone gets into Toyotas.

Where I draw the line (based on my experience) is chasing longevity/strength upgrades for Toyota cases. You will most likely end up disappointed when your upgraded t-case blows up. YMMV, but if you blow it up once, you will probably do it again...and again....and again. And then you'll wish you had sold the duals years ago and put that money + some extra into an Atlas and been done with it, because you just realized you spent Atlas money upgrading/rebuilding Toyota cases and don't have any Atlases to show for it.

Still ended up too long to read. F*ing drugs!
 
Kickdeez said:
I typed a complete novel with a plot and everything this morning bc adderall is fully kicked in. Then realised nobody got time for that, so I deleted and started over. The TLDNR version is as follows:

The type of driveline gearing your talking about would be useful on the left cost. Not as much here. Sounds like you already have enough gearing for the right coast. I would focus on strength of existing driveline componets to handle your buddy yelling "hit it with your purse, you pu$$y!"

The amount of driveline strength you need will depend on your rig's specs and your ability to resist the temptation to put your right foot through the firewall. I promise you, that 5VZE has more than enough power to kersplode even the strongest Toyota gear driven transfer case that money can buy. If you are a sensible driver, and are okay with the idea that you will occassionally ruin a wheelin trip and have to rebuild your toyota case(s), then run what you brung. They are cheap and easy enough to find/rebuild. Hell, that's why everyone gets into Toyotas.

Where I draw the line (based on my experience) is chasing longevity/strength upgrades for Toyota cases. You will most likely end up disappointed when your upgraded t-case blows up. YMMV, but if you blow it up once, you will probably do it again...and again....and again. And then you'll wish you had sold the duals years ago and put that money + some extra into an Atlas and been done with it, because you just realized you spent Atlas money upgrading/rebuilding Toyota cases and don't have any Atlases to show for it.

Still ended up too long to read. F*ing drugs!
Click to expand...
Quoted for truth by someone with the world's most expensive Toyota dual case setup who can't even sell it to buy the atlas I should have in the first place.
 
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