Replacement synchronizers?

Well, 30k miles into my rebuild with new synchronizers old problems are returning (as some of you predicted). It started about a month ago when driving as normal and I got a grind while trying to shift into 4th. I figured it was me, but it did it again a few days later. I changed the fluid out (Replaced the old Redline MT90 with new Redline MT90). Thought it helped, but problems returned. Within about 3 weeks of the first grind, I'm now getting grinds in 3rd and 4th (same two gears I had problems with before the rebuild) on a daily basis. I've adjusted the clutch into factory spec which did fix my squeaking from my TOB grazing the pressure plate fingers, but it didn't fix the shifts. I've found that when I try to shift at lower speeds (I.E. shift from 2nd to 3rd below 25mph) I get grinds more frequently than if I shift at slightly higher rpms. I also noticed that if I mash in the clutch hard and fast, I can shift without grinds 99% of the time. I thought I might have air in my slave since I replaced it, so I bought a Motive auto-bleeder for my master cylinder and flushed the fluid (no change). I'm weighing my options as to what I should do. T56 would be the best and most reliable option, but with the transmission, adapter kit from URD, and a rear-end gear change, I'm looking at 5-6 grand. I could buy a brand new AY6 from Toyota Parts of Dallas for 3200. The risk here is, will a new one be better than my 2005 model? I've heard they made a lot of small changes to the transmissions as the years progressed. I could also try an Auto-swap, but I know I'd get shunned by the community ;) My truck only has 95k miles. It's a 2005 (NA) and has a salvage title (theft recovery) so it's not worth a ton, but I absolutely love driving it and don't want to give it up. It checks off all the boxes on my list of sporty, fun, comfy, unique, and practical from the standpoint that I can haul pretty much anything I need to. I'd hate to give up on the truck though. I finally have it pretty much the way I want it. All of my mods I've done with money I earned from donating plasma at bio-life plasma center, and likely that's how I'll end up paying for whatever option I decide on. My "blood money" has bought nearly all of my mods to this point. Saying that, it will take me some time to save up for whichever option I choose at ~$360 a month. I'm open to suggestions and appreciate your input, -Mark
 

justin13703

Active Member
If you’re going to keep the truck for a long time, I’d go with the t56. Do not spend money on a new Toyota transmission. Those transmissions are steaming piles of garbage. It will do the same thing, plus the gear ratios in the Toyota trans are terrible.
 
If you’re going to keep the truck for a long time, I’d go with the t56. Do not spend money on a new Toyota transmission. Those transmissions are steaming piles of garbage. It will do the same thing, plus the gear ratios in the Toyota trans are terrible.
Have you gotten a new AY6 from Toyota replaced?
 
Nope I don’t. What I do know is that pretty much everyone I’ve seen on this forum have them rebuilt has ended up in the same boat within a few months. Not saying it’s impossible to have a good one, just very unlikely. There’s too many inherent design problems with that transmission.
Mine lasted longer than a few months, but no excuse to be having synchro problems after 30k miles. I’d like to do the T56 swap with URD, but its going to take time to get money together for it. Not sure what it costs to have the rear end gears changed to 410 ratio, but I can’t imagine it costing more than 6k for the whole swap. Also makes me curious about an ls1 swap though. Only problem with that is, I’m not experienced with welding or wiring outside of speaker/stereo setups. Might be time to browse some of the ls1 guys’ builds just for kicks.
 
Not talking about a fresh rebuilt ay6 im talking a brand new trans. Also I can't think of any good reasons a rear swap should cost even 10% of six grand
 

justin13703

Active Member
Not talking about a fresh rebuilt ay6 im talking a brand new trans. Also I can't think of any good reasons a rear swap should cost even 10% of six grand
A brand new trans would do the same thing, it’s just a matter of time. Plus by the time you paid for a brand new Toyota trans, you might as well do the t56.

The way I interpreted it he was saying 6k for the t56 and gear swap.
 
A brand new trans would do the same thing, it’s just a matter of time. Plus by the time you paid for a brand new Toyota trans, you might as well do the t56.

The way I interpreted it he was saying 6k for the t56 and gear swap.
Correct, 2500 for the adapter kit. 1500-2500 for a transmission. Not certain on what a rear end ratio change would run, but it's not something I'd feel comfortable doing myself.
 
There's also setting up the clutch, shifter, speedometer... Im just gonna go ahead and say a new ay6 is all around cheaper including in the long run. Just learn how to play nice with it.. t56 is for the LS swaps in my mind
 
I know it will get me kicked off the forum, or shunned into oblivion, but I think I'm going to convert my X to automatic. I haven't fully committed to this idea yet, but if I do, I'll document it, as no one else has done so to date (documented a manual-auto swap on an X-Runner with the factory 5spd auto).
 

rjbiii

Member
I know it will get me kicked off the forum, or shunned into oblivion, but I think I'm going to convert my X to automatic. I haven't fully committed to this idea yet, but if I do, I'll document it, as no one else has done so to date (documented a manual-auto swap on an X-Runner with the factory 5spd auto).

You gonna source the parts out of a prerunner or convert that baby to 4wd at the same time?
 
PreRunner for sure. Anyone know if factory loom in the X has the additional plugs for an auto trans? Know I’ll need an ECM, interior and shifter bits, drive shaft, trans, cooler, support bracket possibly, lines. Because of our tire size, gearing vs rpm is virtually identical even though we have 3.18 and auto prerunner is 3.73.
 

Slywhitty

"Midget Magnet"
PreRunner for sure. Anyone know if factory loom in the X has the additional plugs for an auto trans? Know I’ll need an ECM, interior and shifter bits, drive shaft, trans, cooler, support bracket possibly, lines. Because of our tire size, gearing vs rpm is virtually identical even though we have 3.18 and auto prerunner is 3.73.

Wanna come for a road trip to canada? I have an auto trans and wiring harness from the engine I bought to replace mine. Trans has been in my basement for 8 years I’ll make ya a good deal. Lol
 

rjbiii

Member
. Maybe the trans doesn’t play well with other guages...

I think you'll need a gauge cluster from an auto as well. The manual trans clusters are different, which could explain why he couldn't get the speedo to work. The auto clusters have the portion on the right that shows what gear you're in, and while that is not necessarily important, it could be the reason why the cluster didn't work. There are bound to be other differences besides just this..
 
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