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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.
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
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!!!
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.
Was looking at the post on pirate. I've gotten really confused.
Your r151 is from an 06, and yet it looks a bunch like a 99 R150 I have (save that output shaft bearing on yours appears to be same size as those posted on the pirate thread., meaning larger not smaller diameter like this 99 does have.)
Did you ever get a chance to open up your 93 was it, and compare?
I have a 94 r150, that was basically messed up, and pulled the case off many moon ago. Could not figure out what was wrong. Anyway, was just rebuilding the 3.oh, and found the 99 like last year, with the 5 spd (r150 also, according to the door plate). So in process of putting in the 3.4, and was going over which parts to use. Of course, the 94-Right hand drop shifter housing / transfer case assembly adapter won't fit on to the 99 r150, because the 94 r150 has that piece of slider shaft that goes into a spot on the shifter housing. The 99 r150 doesnt even 'bump out at that point. It's like maybe 1/2 inch too shy. But even at that to use the 99 r150 with the 3.4 I'll need to get the rh drop xfer case put on, and of course the shorter input shaft on.
Thought about using the 99 bell housing, but then that slave cylinder is on the driver side, which is where my exhaust down flow will be.
It seems that many don't think that the 452 oversized 5th gear would work on the pre 96 r150s, ie the nut-style not the circlip. Did you also think that was actually doable, meaning a proper set of gears etc, could be used?
The r15x is a series of transmissions, 150, 151, 154, 155 and they are similar to the r452 we are borrowing the overdrive from. Over the years the tail sections have changed depending on transfer case or 2wd.
I opend the 93 r150 and the fifth gear in that was retained by a nut and not pressed on, my r151 was the newer press on style, so I was able to use the gears and syncro. It may be possible to find an older r452 parts catalogue to get the proper gear for your older transmission.
Mom using the tail housing from my r150 on the 151 so I don’t have to by another adapter for my crawl boxes since I already have one on my 150.
Hey mate, I didn't get the actual part numbers for the Jeep gears but I bought them off www.cobratransmission.com and everything fit as expected, apart from one modification that had to be done to the main gear. Basically the Jeep main gear has a plain part on both sides and the Toyota has one, so I took it to a machine shop were they wire-cut the excess off and ground it down to the exact dimension. Everything seems to be working fine on bench but I haven't put the box in my truck yet.
seems i might have a bit of an issue, i bought parts 462585k and 462585 and it seems that the inner diameter of the toyota r150f counter gear is 38.015mm and the ax15 jeep gear (462585k) is 34.83mm. this presents anissue obviously. anyone have any ideas or can 100% confirm the r150f (early with the nut not the clip) is 38.015mm ?( edit, the manual i had might be referring to the later model with the circlip and not the model with the nut like i have as the bearing part numbers for 5th are the same between the ax15 and the r150f )
Last edited by Peter Williams; 11-18-2019 at 11:35 PM.
I am wanting to do this in a 96+R150 that I have. I have seen your parts list but I know that you have an Australian transmission. Do you think with the parts list that you made that it could be done with a us transmission that has the circlips? Thanks for any information.
So I bought the ax15 gears from a jeep and dropped it to local bloke who does gearbox overhauls (because I don't have the sst's for the job) and he confirmed the jeep bits fit! Win! Instead of getting the counter gear cut short/turned down he recons ill be able to get the spacer done instead so also a win. Will update when it all comes together
Well last night I tried to mate the older R150 tailhousing to the R151 transmission, but the bearing for the R150 is larger than the R151 and therefore limits the 5th gear engagement. The bearing is to large to fully engage 5th.
Edit: will be ordering a new bearing to see if I can make the r150 tailhousing work.
Edit: nope won’t work without a apraxia bearing and some machining of the tailhousing.
Plan B: Use R151 tail housing and buy a nee adapter for the R1FA boxes.
Well I can't use the old R150 tailhousing for the R151 transmission due to the bearing I would need to use. This won't be a problem for anyone else since I'm the only person I can find trying to use an older R15x tailhousing on a newer R15x trans. Now I need to buy a newer V6 adapter to RF1A case, and sell my existing pre 95 V6 adapter.
R151 new vs R150 older version
Clean Tailhousing from the R151
5th gear fitted, waiting on the new bearing to complete install
I've been researching this gear swap for the last few days for a pre 95 R150. Unfortunately the counter gear is no longer available, which is a huge bummer.
RBX I read some of your posts in a thread on this topic on Pirate4x4. Did you ever try to install the post 95 counter gear on the pre 95 R150?
Also do you or anyone else know the differences between the pre 95 and post 95 counter gear? I understand there are even more changes into the 2000s with the counter gears.
I never tried the counter gear on the pre 95 trans.
if the part numbers are the same for the stock counter gear then the 452 counter should work. Keep in mind this is also called an AX15 trans found in Jeeps. There are a couple companies that supply kits for this on the ax15. You might find the parts through other jeep vendors.
04-25-2019, 11:40 PM
