grayfj62turd
SILVER Star
I've search the threads for this "clunk" shifting situation in my 89 FJ62. What should I check?
Hard "clunk" when shifting into reverse and drive. 1989 FJ62. Doesn't happen all the time. (1 Viewer)
- Thread starter grayfj62turd
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Chock wheels, shift vehicle into neutral, rotate rear driveshaft back and forth. See if the rear axle has a lot of play. Another possibility (and really probably most likely) is worn splines on your transfercase gear/output shaft.
Edit: I forgot, there is also the slip-joint on the driveshaft. There is a grease fitting on it. Try greasing that first.
Edit: I forgot, there is also the slip-joint on the driveshaft. There is a grease fitting on it. Try greasing that first.
Last edited:
Have you been keeping up with lubrication? My 60 has a thunk when starting from a stop, louder on passenger side, so I am thinking drive shaft. Been reading about greasing the slip yokes in the drive shafts.
forum.ih8mud.com
Seems it is an issue on many rigs that was remedied with greaing.
I hope that helps.
The OFFICIAL clunk/thunk driveshaft thread
My thunk has gotten to the point where I will spare no expense and go to the ends of the earth to fix. Re-greasing was making it better, but not completely solving it. However the rear was re-greased about two months ago and now it is thunking worse than ever. About 18 months ago I had the...
forum.ih8mud.com
Seems it is an issue on many rigs that was remedied with greaing.
I hope that helps.
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This isn't normal? Valley Hybrids has a clunk eliminator kit that I've heard of.
My 62 has a very hard clunk when I put it in reverse, it’s shifts into gear hard enough that the whole vehicle will lurch backwards sometimes. Doesn’t do it in drive. The transfer case and transmission were rebuilt very recently and it hasn’t made it go away.
Good luck!
Good luck!
Same here. Just got my TC rebuilt and "newer" trans put in. Trans shifts like butter now, but still getting the clunk in reverse even with the long spline from I got. Going to try greasing everything today.
Not very technical but I've found that this goes away completely if I press hard on the brake pedal when putting her in reverse. Now the only time I hear that clunk sound is when someone else is driving, which is rare.
The shifting "clunk" in the fj62 is generally caused by wear on the output shaft of the transmission where it goes into the transfer case. 30+ years of engaging in Reverse and Drive with the auto trans. wears the splines and there is now slack between the shaft splines and t-case gear splines.
There is a t-case gear known as the McNamara gear that has a longer inner spline body that engages fresh untouched splines on the output shaft. Makes everything tight again, "clunk" eliminated.
There may also be slack in the 30+ year old rear end that is amplifying the issue.
There is a t-case gear known as the McNamara gear that has a longer inner spline body that engages fresh untouched splines on the output shaft. Makes everything tight again, "clunk" eliminated.
There may also be slack in the 30+ year old rear end that is amplifying the issue.
You boys need to just go manual!
tmxmotorsports
SILVER Star
Says he already has the long spline gear in the tcase
Thanks. I had my TC rebuilt and got a long spline shaft installed. Drove her about 80 miles today. Drove great until I idled for 5-10 minutes with my AC on and my engine damn near lost all power. Barely made it home. Going to look for some vacuum leaks, clean throttle body, basically give it all a good look over.
Hi, while discomforting,all mine have done it since almost new. Our fj80 has 400,000 miles and still going strong.
Back in the old "3FE Yahoo" days, there were a couple of threads on using Green grease on the DS splines to help cushion the slop. Might worth a try.
Your rear diff probably has a good amount of play in it as well.
Your rear diff probably has a good amount of play in it as well.
Reviving another old thread I found while searching -
1989 FJ62, 247k miles - dont know history about the auto transmission.
Just did a drain and fill on the A440f as I had noticed the fluid was dark brown almost black and had a scent to it. Only reason I did this was because of the quality of the fluid, otherwise shifting was actually really smooth, shifts seem to have been on time, but had that nasty Reverse clunk which worsened when warmed up. I also think the transmission may have been overfilled.
My questions are,
- has anyone had the clunk disappear after 1 drain and fill ? Throwing the truck in reverse now, whether cold or hot, is a light click and no more clunk and hard jerk
- After this one drain and fill, I can see a little red, but still mostly brown. Does this mean that the transmission likely overheated or is it only due to the fact that I was only able to remove roughly 7 quarts and (hopefully) replaced the same amount (even though I spilled some around the dipstick lol)
Thanks.
1989 FJ62, 247k miles - dont know history about the auto transmission.
Just did a drain and fill on the A440f as I had noticed the fluid was dark brown almost black and had a scent to it. Only reason I did this was because of the quality of the fluid, otherwise shifting was actually really smooth, shifts seem to have been on time, but had that nasty Reverse clunk which worsened when warmed up. I also think the transmission may have been overfilled.
My questions are,
- has anyone had the clunk disappear after 1 drain and fill ? Throwing the truck in reverse now, whether cold or hot, is a light click and no more clunk and hard jerk
- After this one drain and fill, I can see a little red, but still mostly brown. Does this mean that the transmission likely overheated or is it only due to the fact that I was only able to remove roughly 7 quarts and (hopefully) replaced the same amount (even though I spilled some around the dipstick lol)
Thanks.
I installed the long spline "McNamara" gear when I was installing a "newer" transmission and still had the clunk. I also developed a hard shift into second gear after a while as well as the reverse clunk. After about 6 months of living with it, I decided to set the throttle cable and kick down cables to original factory measurements per the FSM. What I found was my kick down cable was binding and the grommet/plastic piece going into the transmission had pulled out. What they don't tell you about installing a "newer" transmission is that you should probably replace that kick down cable as well. Lesson learned.
Ended up replacing the kick down cable (Not that easy by yourself, but others on here say it was cake). After I replaced the kick down cable and played with the adjustment, the clunk was all but gone and it now shifts like butter for a 36 year old LC.
Regarding your other question: I installed an oil cooler after I had my transmission light come on after going up and down hills for about 100 miles. I also thought my trans was cooked. I let it sit and eventually had an oil cooler installed. Did the Rodney flush a few times by disconnecting lines through my new oil cooler and cycled fluid through. Much easier that way IMO. These transmissions are beasts and it takes a lot to kill them. I do know when this trans goes, it's H55F time or a complete LS swap.
Good luck!
How long have you had it? The dark color is somewhat troubling, but I would be inclined to leave well enough alone at this point. Fluid change, New TV cable, transmission cooler and McNamara gear did not get rid of my FJ62 clunk.
Thanks for the feedback about the oil cooler - I had wondered if I should even bother attempting to save this one by adding the cooler as opposed to allowing to really "break" and then adding during a rebuild.
I actually thought this since it was shifting well and only annoyance was the reverse clunk. Thoughts were to allow it to break, save the pennies and decide once it had finally given up but the fluid was so dark and had a strong scent that I felt maybe I do this it could also serve for some"educational" purposes if my change screwed things up.
This gray one ive only had for about 4 months, and while theres some records, none of them have anything to do with transmission/driveline maintenance. When you look at the transmission housing though its shiny compared to everything else thats grimey/oil soaked etc .. This feels like someone who spent some kind of money on a rebuild OR replacement, and figured they'd never touch the fluid ever again.
