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R452 5th Gear in R150/R151

Old 04-25-2019, 11:40 PM
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Originally Posted by Peter Williams View Post
basically it looks like they've just lathed down the gear on one side ?
Yeah, sort of. But since the gear is probably heat treated/case hardened it would've been harder to take that all off on a lathe + it might have an effect on its hardness since it would've been over-heated again by the same process. So I requested for it to be cut on a wire-cut EDM machine and brought to exact dimension on a surface grinder.
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Old 06-09-2019, 06:26 PM
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r452 5th gear mod R151

Photos added UPDATE

The below part numbers were used to fit the R452 5th gear to my '06 R151f transmission. As pictured earlier in this thread my trans has the snap ring on the counter shaft as newer R transmssions have. Note: I ordered all the other parts because the of the differences noted in various threads on various years.

I believe the below parts will fit the snap ring R transmission variants.

33394-35040 KEY, SYNCHROMESH SHIFTING, NO.3 x3
90364-30009 Split BEARING (FOR COUNTER 5TH GEAR)
33369-35011 RING, SYNCHRONIZER, NO.3
33336-25030 GEAR small
33046-25030 GEAR counter
33392-14020 FASTENER big spring for dogs x2
33395-35041 GEAR hub ring
33318-35050 GEAR counter shaft end

This is the 2006 R151f 5th gear counter and supporting parts(i left the bearing out if the pic )


here we have the R452 5th gear counter with supporting parts compared to the R151 (R452 is closest)
Note: I only ordered one syncro key, you need three, most sites show 3 but price is for 1. So I have more on order. I also need to order a second spring to hold the syncro keys. The C-Clips that hold the 5th gear in place are actually different thicknesses, so I have a few sizes on order to complete the install. Not sure how much this matters but at .62 I'll see if I can fit the proper size.


Fitted, sorta, need to press on after I get the other syncro keys


Short story.... order all the parts that I show above, the 5th gears and syncro styles have changed over the years. I believe this mod is also possible with the nut style R150 transmissions but I haven't tried to mount this on my '93 R150.

Please be aware, as of this post, I have not driven the vehicle to make sure all parts work as intended....stay tuned.

Last edited by RBX; 06-12-2019 at 04:08 AM. Reason: added images
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Old 06-20-2019, 05:00 AM
  #23  
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Pre 95 R150f stock 5th gear with reverse removed, you can see the syncro and three keys are very similar to the R452 setup. Infact I reused one of the retaining springs but the keys are different.


Shift Hub/Ring with keys and spring


Full 5th gear


I discovered that the reverse gear is different then the R452, as I could not interchange them to the R151f.
Now I have hit a snag...
While assembling the R452 reverse gear it seems to be bottoming out and i cannot insert the c-clip, and I did not measure it before hand.....ARGH!!!
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Old 06-25-2019, 10:31 AM
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Installed R452 5th gear on a 2006 R151f transmission!!!!



and the rest of the mess, two R1FA transfer cases Inchworm Doubler adapter and an Inchworm R150 to R1FA adapter.
Replacing a few bearings while I'm in there. Can't wait for lo-lo behind an idling grease burner.
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Old 06-25-2019, 02:21 PM
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Congrats dude! Where do you order your parts from?
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Old 06-25-2019, 02:27 PM
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Originally Posted by RASALIBRE View Post
Congrats dude! Where do you order your parts from?
For foreign parts, not NA market
partsouq.com
or
amayama.com
or
Megazip.net

for NA Market
https://parts.camelbacktoyota.com
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