Transmission slippage after coolant job

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Joined
Dec 3, 2025
Threads
6
Messages
15
Location
Missouri
Hello all,

I just completed a full cooling system overhaul plus several jobs "while i was in there" of course. I have everything back together and drove it to work just fine yesterday. Now, however it feels like im driving in neutral. My rpms increase to 2-3k when i give it gas but almost no acceleration. i only get acceleration at 4k+ rpm. i drove home from work at 1am in a storm going 20mph last night... I replaced the radiator, so im thinking it could be low fluid, but i just added a little bit and although i had little time to experiment it did nothing. I also did the throttle body and im wondering if it could be one of the throttle wires? Other areas i couldve messed up included any thing in the phh area or maf area of the engine bay.
 
@luhcruh : Try to answer all of these questions:

What model/year Land Cruiser?
How many miles on your 80 Series?
Any prior similar symptoms?
Describe the issue with more detail ie: does it feel in the transmission works OK in low then slips until you get into another gear or ??
Do you hear or feel any slipping/grinding noises/vibrations?
Any check engine light/codes?
How exactly did you check the ATF level and what did you find? (hot or cold engine/transmission, engine idling, transmission in Park, parked on a level surface)??
What type of ATF in in the transmssion and how much did you add after the radiator replacement?
Which "other" jobs did you do, what did you disconnect/touch/manipulate/remove/replace/install while you were working on the cooling system?
 
Last edited:
95

i didnt disconnect any cable when i did it, just hung the TB by a zip tie out of the way. is there any chance it couldve moved?
double check the kickdown cable. Also check the transmission fluid properly and when warm.
 
Got it figured out! Checked the fsm on specific trans fluid checking procedure and topped it off. Thank you!
good result. If it's been a while since you've done a full ATF service, I'd seriously consider it, either by taking it to a shop that has a fluid exchange machine, or by using the rodney flush method. Doing a simple drain and fill will only replace a small fraction of the total system fluid capacity.
 
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