I replaced my thermostat andThermostat housing, This project took me 2-3 weeks as i have 4 other cars and looked everywhere for the best deal and still had to buy it from the dealership, BTW the wanted 600 just in labor to replace it plus parts....about 800-900 for a 1-1.5 hour job. Anyhow i finally got it together and...........YUP...the fricken trannys acting up, never did before. Its real stiff, and when you put it in drive it will only drive in 1st gear, If you stop and run it through the gears it runs fine. Seems to loosen up a bit after being driven for a bit, but as soon as it sits for a bit or over night, STIFF and will only drive in 1st till you shift it through the gears at a stop.......then OK again.........HELP! Did i disconnect something?

 

Sorry it took so long for me to reply, but its a 99 xj8. And as for it being low on tranny fluid... I thought it was a sealed unit? Well anyhow its still doing the same thing, and as long as i keep running thru the gears before i leave, i have no issues.