Transmission Question

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David70FJ40

David70FJ40

Older Than Most
10 Year
Joined
Oct 9, 2014
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172
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2,531
Location
High Point, NC
I am finally able to start enjoying the 40 I have been working on for the past 13 months. One of the alterations was converting it t a 4 speed and removing the unsynchronized 3 speed transmission. But I have noticed the 4 speed has far more whine than the 3 sped did, or at least that is how I remember it. How much whine should come from the transmission?
 
Wine is ok but only if its a good vintage and paired with a good cheese. California Wine is the best........


Oh wait you said Whine. In my experience all Toyota stick shifts I've driven, except the newest Tacomas, whine. You would have to post up a video or sound clip for others to really comment on if its really loud or not. Most likely it I normal..... Everything about a 40 is loud
 
Input bearing? Does it make noise with clutch disengaged (pressed in) ?
 
No noise when idling with the clutch pedal depressed. Noise only when traveling.
 
I meant while traveling, if you depress clutch - does it affect noise. I'll check mine tomorrow. MAybe i can record a video with sound....
 
If I depress the clutch while traveling the noise abates and returns when the clutch is engaged again and power is applied by the engine.
 
David, to answer your question, the transmission (when new or newly rebuilt) makes almost zero noise. The same is true for a freshly rebuilt transfer case. If the whine is loud and obnoxious it is time for a rebuild, however, generally speaking the 4 speed is bullet proof and with proper lube will not leave you stranded.

It is worth noting that while a 4 speed can obviously have a whine, the first place I would look would be the transfer case. Did that get changed? The idler shaft in the TC is notorious for noise after a little wear.

If the input bearing on the tranny is bad, as ErikinSC mentioned, just replacing the bearing will abate most of the noise but a bad bearing will also have affected wear patterns on the gear cluster, i.e. will never be perfectly quiet.

Rebuild kits for the transmission are available for ~ $200 and contain only bearings and gaskets.

EDIT: I don't have a lot on the agenda today if you would like to have someone else give it a listen. @jfz80 may also be about.
 
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If pressing the clutch makes it go away, that sounds like the throw-out bearing to me. I assume you replaced the TO bearing though when you swapped the transmission, right?
 
As a rule the TO bearing makes noise when the clutch is pressed rather than released.
 
jfz80 said:
I am around as well today if you want me to give a listen....
Click to expand...

Thanks Jason. I plan to be here all day and the 40 is ready to go.

As for the other suggestions, the TO bearing was replaced with the clutch, pressure plate and pilot bearing. The 4 speed showed a little rust on some teeth when I received it but had been full of grease prior to my purchase. (Leaked into the boxing) The TC is the same one that came with the original 3 speed and was inspected prior to reinstalling. The transmission shop said everything looked good and all I needed to do was the change the grease after a hundred miles of driving.

Another question, is there a transmission shop here in NC that can rebuild the transmission and TC if needed?
 
If it showed rust on the teeth it could of been on more. I would never throw one with rust in my truck with all the work involved. I would tear it down and go through it before that.

If it comes down to it I have been known to build them over the years. Then again there are other shops closer than I am most likely that are just as capable.

Sent from my SM-G920V
 
Whoa ! No need for a transmission shop - U CAN DO IT ! and if all fails, then a HAMOM or transmission shop is in order.

* can't upload video from app....
 
Prior to installation, the top cover was removed and the teeth were inspected. Only three or four teeth on the main cluster had any rust showing. I did take it to a transmission shop in Asheboro, R & R Transmissions, for closer inspection and repairs if needed. The shop was recommended to my by the shop that rebuilt the head and he stated that shop was good at rebuilding Aisin transmissions. After 6 weeks, the transmission hadn't been moved and I picked it up after hearing the same excuse over and over. Seems the sons were more interested in building their Caraway race cars than helping Dad get work out.

As for me rebuilding the transmission, I might be able to do it but this is something I would leave to a more experienced person. The last thing I want to happen is to go through the trouble of removing everything then do a less than quality rebuild then find the transmission fail from something I didn't do properly. I have an idea of my limitations. Now if a group wants to come over and tackle the project, I will be more than happy to assist but keep in mind I don't have a closed garage to work in so this might have to wait until Spring.
 
David70FJ40 said:
The last thing I want to happen is to go through the trouble of removing everything then do a less than quality rebuild then find the transmission fail
Click to expand...

The very reason not to let someone else do the work. Just too much "Take their money but I really don't give a crap" attitude out there.
 
Rice said:
The very reason not to let someone else do the work. Just too much "Take their money but I really don't give a crap" attitude out there.
Click to expand...

Sound reasoning. Come on by with Jason so there will be two opinions.
 
How does 230 sound? Maybe a few min after? Maybe I can roundup Ryan and his stock 74 for comparison
 
Sounds good to me.
 
A few cruiser folks went to visit David yesterday. David, the 40 has come a long way and should provide you with years of enjoyment.

There were several sounds happening in the drivetrain but the transmission was the biggest offender. If anyone remembers M22 "Rock Crusher" trannies that Muncie made back in the 60's for road racing then you know the sound.

David, it occurred to me on the way home that if you end up pulling the trans out either to rebuild or replace it would be the perfect time to also put a bearing kit into the TC. There are several threads in the 40 tech section that document the rebuild of each and, as mentioned, an added option is to have a HAMOM if you want club members to gather and help with the process.

BTW .... let us know what you find out after checking lube levels.

Kits: High Quality Transfercase Rebuild Kits

I did not "document" the TC build I did earlier this year but did post some pics.
TWT -- the wrenching thread

Now comes the decision part .... rebuild what you have or put in another unit? I suggest rebuilding the existing unit simply because any other 4-speed you find is going to possess the same unknown past as the one in there now. Putting in a kit will get you as close to "new" as possible with one of these units.
 
I was under the impression that special pullers were needed for a transmission rebuild? Something about the mainshaft bearing removal from the case?

I also documented a transfer rebuild where we swapped the lower 3 speed gears into a 4 speed case.

Installing 3 speed transfer gears into a 4 speed transfer case
 
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