Manual trans clunk

It is my understanding these transmissions are normally "notchy" or "difficult to shift" at times when to/from second gear. If you search on the TTORA forum you'll find some info about it.

Mine has had similar symptoms for years. I have tried various types of oil, changed the shifter seals, you name it. I am just now extra careful when shifting. Most of the time I do not feel anything...only when I try to shift very fast on that gear.

 

I would Pull a gear oil sample out of the trans and rear end, about a quart out of each in clear or opaque containers if you can.

 

Make sure your clutch pedal is adjusted properly, and you might even make sure your ubolts are torqued properly.

 

Yes I have heard that too, what had me worried is it has always shifted so smooth up until the past few months. And I expect some notch but sometimes it just won't go into second. I wish I had never changed out the fluid at this point because it was fine. Oh well..

 

I'll see if I can do that soon. Just wondering what would the rear end have to do with it?

 

If the gear oil is clear on the rear end,,you have for the most part eliminated that avenue of your "whine noise during acceleration" sound,,which could be a multitude of things including the rear end. Not completely eliminated,,but it's a easy check while your under the truck and dirty already.

 

The whine may be from the release bearing.

 

Interesting, I can guarantee that it's the original fluid in the rear. I ran it pretty hard this winter in the snow so maybe it's crying for some new fluid. I am headed to my local redline dealer tomorrow to get some fluids and I'll add some mt90 to my trans since I filled it on level ground. Ill try overfilling it a tad and I hope that's my problem. I really wish I had just left my fluid alone since it was shifting fine before I did mt90. I'm starting to believe in the 'if it ain't broken don't fix it" motto...

 

You might swing away from the Red MT90 and try something different,,since it wasn't in there before. I realize what it is and it's ratings, but it's the first? thing that was changed and caused problems,,if I read that correctly. Try a Napa/Sta-Lube 75-90 GL4 as a suggestion. I honestly don't think it will make a difference,,but it's somewhat easier on the wallet and body as far as quick reversals and double checks are concerned.

Owning up to ONE of my mistakes earlier,,was that I put a straight 90wt gear oil in the box on the last change. When it's really cold outside,,the box has more resistance when setting off. A little bit tougher to make gear changes smoothly. I attribute that to old age and fresh heavy oil. I have about 30-40K on it now with no other issues. I see that the Redline stuff is rated as it should be for the Man trans, But again, it's the first? thing you changed that made things go sour.

A new shift stick seat cured the problem for a short time. Maybe double check your work there, make sure things should be as they should.

 

Today I changed my diff fluid to some new Mobile 1

$28 75w-90 Synthetic Gear Lube - 1 Quart (Pack of 2)

75w-90 synth. and it has cured the whine from acceleration so good call on that! I realized today that my week old BFG TA/KOs are quite a bit heavier than my old highway tires and was the source of extra strain on my diff causing the whine. I do have a pic of the old fluid if anyone wants it, It was definitely cloudy and worn out.

Luckily, I found a local redline dealer where I can get MT90 for 9.99 a quart. I picked up another quart and am going to check my bushing and seat, and add some fluid as soon as toyota gets my replacement shifter boot so I can do it all at once. I put a good number of miles on my truck today (unusual for me) and it seemed to shift better as the day went on. Im really thinking it just feels a little dry and that a little more fluid will fix it. If it doesn't then I'll drain a sample and update on here. Thank you guys for the massive help!

 

New guy here but... I think the 1st to 2nd clunk is not an issue, just a characteristic. My '97, bought new in '96, has had the clunk as long as I can remember. I sometimes think it may be caused by the drive line backlash inherent to the LockRight locker installed at 13k miles but that thought is probably just me overthinking it. 202k + original miles, original clutch, regular maintenance, no issues with the tranny(or otherwise). As long as you are not having other problems I would accept the noise and just drive it. Just my two cents.

 

Thanks for the insight spooky. So I pulled the shifter and bushing and used some Emory cloth to smooth things out more. I re-greased everything and put another ~.3 quarts of mt90 in and things seem better, though still not right. I know how my truck drove 5 months ago and how it is now doesn't match up. Ill deal with it until I can start looking at clutch or syncros. I think my snow shenanigans are the source of problem and it just happened to be around the time I did mt90.

 

Somebody mentioned the lock right locker as part of the issue.

That assumption is actually correct. It is a known fact that you feel automatic lockers more with a manual tranny. Each time you engage/disengage the clutch pedal you probably feel the locker behaving more than if you just had an automatic tranny.

Remember that an automatic locker engages when you have power in your driveline. That's why guys with lock rights an auto trannies hardly ever complain about noticing the locker's behaviors.....

 

I have manual lockers.. But good to know!

 

If you know the whining noise is coming from the trans, I'd say your input shaft bearing is going out, the difficult shifting maybe worn synchros