228K miles on my 85 Gwag, and I suspect all original.... I did some heavy towing once, pulling another FSJ for about 200miles, the trans got pretty warm... I could feel the heat thru the floor and a snowy day... So I pulled over and waited 30 mins... after that trip I drained and changed the filter, that was 15 years ago... and probably 20Kmiles...
When I said drained, after I replaced the filter and reinstalled the trany pan, I disconnected the trans cooler line and did a total renewal by adding fluid after I would drain about 2 quarts... and did a whole 12 quarts to make sure that the converter had new fresh oil.
Edit a day later: I installed a transmission temp gauge, very effective tool to know what is happening... on a cold 25F day, the fluid will barely go over 95F... even after 50miles... on stop and go traffic on a mild spring day... 150 to 170F.... slipping on sand... it can go to 210F and drop back to 170 withing minutes... it is quite entertaining...
74 wag, 349Kmiles on original ticker/trany, except for the rust. Will it make it to the next get together without a rebuilt? Status: needs a new body.
85 Gwag, 228 Kmiles. $250 FSJ test lab since 02, that refuses to give up but still leaks.
See Ouray 2013
, Engine bits
and Fuel and brake lines
, and Body work
Last edited by letank : 08-18-2022 at 05:43 PM.