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So apparently I didn't properly do my homework.. I got my gears, tools, and trans all together in one place after reading this thread. I think the part numbers listed might be for the Tacoma trans in the states as the counter gear(33046-25030), is the right number of gears but otherwise wrong for the '92 r150f. The bearing pocket is approx. .25" bigger than mine and its also a good bit taller when laying flat on the bench.

Ive done a little more digging and found that part number 33046-25020 is listed for the pre '96 dynas, but so is 33046-25011. Are either of these the ones that got superceded? Both are around $200 so I don't wanna go shooting in the dark and get the wrong one again. Id post pics if I could figure it out but no dice yet. Does anyone have any input on these?
 

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Discussion Starter #23
Been quite a while now since posting this.
The mod has been great - did exactly what I wanted.
Highway top speed limit in Aus is 100kph (around 60mph) in most areas and with my 4.88's on 33" tyres I see 2250rpm.
The only thing I had to get used to wast the rather big change in rpm going from 4th to 5th.
 

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Been quite a while now since posting this.
The mod has been great - did exactly what I wanted.
Highway top speed limit in Aus is 100kph (around 60mph) in most areas and with my 4.88's on 33" tyres I see 2250rpm.
The only thing I had to get used to wast the rather big change in rpm going from 4th to 5th.
So what are you topping out at on the highway now with the bigger 5th gear at 2250rpm.

thanks for the update
 

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So apparently I didn't properly do my homework.. I got my gears, tools, and trans all together in one place after reading this thread. I think the part numbers listed might be for the Tacoma trans in the states as the counter gear(33046-25030), is the right number of gears but otherwise wrong for the '92 r150f. The bearing pocket is approx. .25" bigger than mine and its also a good bit taller when laying flat on the bench.

Ive done a little more digging and found that part number 33046-25020 is listed for the pre '96 dynas, but so is 33046-25011. Are either of these the ones that got superceded? Both are around $200 so I don't wanna go shooting in the dark and get the wrong one again. Id post pics if I could figure it out but no dice yet. Does anyone have any input on these?
Did you ever find the answer?
 

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Discussion Starter #26 (Edited)
I've had some more feedback on the other pages this info was posted and updated this thread with some warnings about the obviously different R series boxes that exist.

below is the relevant info that might interest the most recent posters:

I found this interesting info on a Kiwi forum that may be the answer to people with the older R series boxes:
Offroad-Express • View topic - PUTTING OVERDRIVE GEARS IN R150f GEARBOX
"ive run into the same problem.
i have a r150 from a 94 surf which has the nut on the end of the shaft not the circlip. standard fifth gear teeth counts are 26t & 46t dyna gears are 23 & 49.
i ordered dyna 5th gears from amayama, part numbers 33336-25030 (on mainshaft) and 33046-25030 (on countershaft)
the main gear fits but the counter gear doesnt. ive found more part numbers for the counter gear and think 33046-25011 is the one i need but amayama cant supply it.
it seems 25010, 25011,25012 are all the same counter gear for pre 1995 & 25020 & 25030 are for 1995+.
im trying to find a supplier has anybody accomplished this mod yet?"
 

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So apparently I didn't properly do my homework.. I got my gears, tools, and trans all together in one place after reading this thread. I think the part numbers listed might be for the Tacoma trans in the states as the counter gear(33046-25030), is the right number of gears but otherwise wrong for the '92 r150f. The bearing pocket is approx. .25" bigger than mine and its also a good bit taller when laying flat on the bench.
Would it be possible to use a different bearing to make up the difference? Wonder if the later box uses something different as I've seen the rebuild kits suit different years. Also is there any way you could machine the gear down to match the old one?
 

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Does anyone know if you can swap the tail housing from an r151f to a r150f? I ask because I have an 06 Hilux r151f trans that I'd like to use the tail housing from my 93 R150 so I can keep my adapter for the v6 to gear driven t-case.
 

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HELP PLEASE!!re R151 5th gear upgrade
Hi folks has anybody successfully completed the R151 5th gear upgrade Dyna (R452 5th gear swap) i follwed the instructions from totalux post (2015).
i bought the dyna 5th gear and 5th counter gear, all was going well until i removed the R151 5th gear counter gear. the issue i have is the 5th gear counter gear is a completely different design which means i cannot swap the synco components( gear spline piece, synchroniser ring) as per instructions from Totalux (2015).

i am at a loss as to where to go for solid information and frankly what questions i need to ask.

also i have 2 R151 gearboxes a 2001 and a 2009 and they also have different designed counter gears. any help will be muchly appreciated. please feel free to email me [email protected]
 

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Well that sucks. Have you tried messaging the OP? I'd start there for some help.
I skimmed back thru the thread and he doesn't say what year the gearbox was he used(r151). I have a 2006 r151f on my 1KD-ftv here in the states, and I'm getting ready to this same mod while I'm swapping the engine in the 4Runner/Surf. I was trying to hold off on doing this for another couple months as I'm waiting on parts for the engine, but now I think I should open it up and see what I have in the '06 r151.

good luck and please report back
RB
 

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I just completed this swap in my 92 R150 with the pressed on gear and nut holding on the gear. the gear came off with some heating and pullers. The correct part numbers for the early R150 are 3304625012 and 3333625030.
I ordered from amayama. com
3304625012 is the new number for the countergear.
I'm lovin the low RPMs:)
 

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Looks like I used 3304625030 & 3333625030 when i did this just under under 12 months ago. Both parts were/are still available through amayama.
Where are you located? Seems like the US versions need the obsolete part number 33046-25012 and not the 33046-25030.
 

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Has anyone looked into doing this Dyna r452 5th overdrive gear swap on these newer r151f transmissions?

it seems as if the 2010 and newer may use a different setup and may not be compatible. I was just looking at buying a 2013 model with low miles, versus a buying and combining a '95 R150 with 150,000 miles & a noisy needing rebuilt '03 R151, + Dyna R452 5th gear & countershaft 5th gear...
 

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A few people have mentioned to me that they could not get the 5th gear off the output shaft as it is pressed on.
It seems that if you have the older R series with the nut on the end of the counter shaft then this mod becomes more difficult.
On my R series (circlip on the output) the 5th simply slid off and on by hand.
I went back to the R151 manual linked above and found that the 5th is indeed pressed on for these older model R series.

Further to this two people that have managed to get the gear off these R series boxes with the nut have found the gear I list below does not fit their gearboxes.

So before buying anything check what box type you have as there seem to be differences in the R series depending on age.

Dyna fifth: 0.69
23/49 (5th and counter gear teeth) = 0.469 x 1.482 (cluster ratio) = 0.695 = 30% OD


R15x fifth:
26/46 (5th and counter gear teeth) = 0.565 x 1.482 (cluster ratio) = 0.836 = 17% OD

In the interests of those looking into this swap for 2000's/2010's model R151/R150 transmissions, I should point out that the part numbers listed here for the R452 are for Dyna R452 transmissions from 05/1995+, but the original poster did not specify exactly what year gearbox this went into smoothly for his swap.

There is a bit of uncertainty of compatibility with later model 5th countershaft gear synchro parts etc.

Perhaps the 25030 versions are compatible with the later model 2000's R150/R151? But may require all of the related syncro hub/spring pieces as well if going from the 4 pawl/detent(?) style to the older 3 notch style?>>>




Well that sucks. Have you tried messaging the OP? I'd start there for some help.
I skimmed back thru the thread and he doesn't say what year the gearbox was he used(r151). I have a 2006 r151f on my 1KD-ftv here in the states, and I'm getting ready to this same mod while I'm swapping the engine in the 4Runner/Surf. I was trying to hold off on doing this for another couple months as I'm waiting on parts for the engine, but now I think I should open it up and see what I have in the '06 r151.
RB
I have talked to RBX, and he actually just ordered some of these Dyna gears to attempt to fit them to his 2006 Australian market R151. I believe he ordered the newer versions that had part numbers ending in 25030, vs the 25020 that the original poster linked to, although he installed the 25030's on what we are assuming must be a 1995.5+ model R150 or R151 gearbox, through 2000-ish?????
 

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Btw, my 2006 R151f trans 5th gear seems to match the 2009 gear shown above in this thread.

I'm beginning to wonder if the only option for the 2000's R-series 5th gear swaps is to buy all of the corresponding parts for the R452 countershaft gear as well? As long as the R151 shift fork is compatible with the R452 5th countershaft gear...

As it seems to me now, the '95.5 or '96 through 2000 or 2001 R150/R151 gearboxes seem to be the most likely guaranteed swap candidates.

I've got to look those up next & see when the part numbers changed from the 96 models to those pictured in the 2001 & 2009 R151 5th countergear photos above...


Without differential gear changes from current 4.56 down to 3.90 or 3.73, my turbodiesel swap's highway rpm's are going to be way too high for optimizing for the best fuel economy (3100+rpm).
The R452 5th gears are really the only real answer without losing crawling capabilities, & that still puts me at 2450rpm or so. 4.11 (& 31" tires) or 4.30 diff gears (& 32" tires) would be best on top of the .695:1 5th, for 2200 or 2300rpm @ 70mph, & still a capable 4th gear rpm for when hauling heavier loads since pulling a trailer (motorcycles, utility hauling, etc for me) is frowned upon in 5th overdrive gears in almost any transmission, especially light to medium duty gearboxes like the W56 or R series.

Gearing calculator:

4.56 diffs * 30.6" tires * 0.695:1 5th overdrive ratio @ 2,088RPM = 60.00mph (the turbodiesel I'll be running starts building a lot of boost around 2,100RPM, if it can push my lifted 31" tire 4x4 @ highway speed up hills at this RPM, may consider swapping down to 4.11 diffs for lower rpm's at 70mph - which should also help deter towing heavy loads on my utility trailer in 5th which is frowned upon in all AX and R series trannies)
4.56 diffs * 30.6" tires * 0.695:1 5th overdrive ratio @ 2,436RPM = 70.00mph
4.11 diffs * 30.6" tires * 0.695:1 5th overdrive ratio @ 2,088RPM = 66.77mph (see note above, running 4.56's now)

HELP PLEASE!!re R151 5th gear upgrade
Hi folks has anybody successfully completed the R151 5th gear upgrade Dyna (R452 5th gear swap) i follwed the instructions from totalux post (2015).

The issue I have is the 5th gear counter gear is a completely different design which means I cannot swap the syncro components( gear spline piece, synchronizer ring) as per instructions from Totalux (2015).

i am at a loss as to where to go for solid information and frankly what questions i need to ask.

also i have 2 R151 gearboxes a 2001 and a 2009 and they also have different designed counter gears. any help will be muchly appreciated. please feel free to email me [email protected]



 

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I should have mentioned I also bought all the associated springs and hardware since shipping is pricey and I think it only added another hundred to my order, bought a gasket kit and some other stuff for the engine swap. Parts haven’t shipped from japan yet, I’ll be sure to post up what I find
 
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