ORIGINAL: v6inva

i got a 99 v6 5spd with 74k miles.

i can tell the tranny fluid needs to be flushed b/c when i shift the tranny thunks like i hit a bump in the road.

anyways, has anyone had it done and how much does it cost? also what tranny fluid should i use (besides OEM)?

thanks.

ORIGINAL: v6inva

well i bought it used and i wont be able to find out if it was done before.
the tranny sounds like its begging for new fluid.
should i risk it....?
if i leave it without a flush wouldnt it be more harmful?

ORIGINAL: 03YellowPony

I always recommend synthetic fluid now. And you are right on the threshold of NOT doing the flush. UNLESS it has been done before. The reason is, if the original fluid has been in this long, and you flush it, crud will still be in there, only its gonna be in more of a solid form. And after the flush, it will break loose, causing leaks at the input and output shafts, and possibly cause damage to the clutches inside. I had mine done at 40k, and with the synthetic fluid, it cost me about $80.00. But that was a flush without doing the filter. If you do it early enough, you don't need to do a filter the first time. I've done over 200 tranny services, and I have seen the leaks occour after doing it after 70-75,000 miles without it being done before. Most maint secheules call for it being done at 60,000mi intervals, if at all. Dodge claims you need never service thier auto trannys ever. Or at least they used to. But that is pure CrAzY! IMO.

ORIGINAL: KillerV6

Hey eveyone....NEW to the Mustang Forums...MY 99 V6 Stang Auto is doing th same kind of Thug, that a few other people were having happen to them...I am at a few miles over 60K...Would it be a good Idea for me to have my Trans Fluid Flushed/Replaced???