To each his own... I think parts are hard enough to come by for those old transmissions. I'd not choose to go that route, -- Mark Price Morgantown, WV 1969 AMC Rambler, 4.0L, EFI, T-5 2004 Grand Cherokee Laredo, 4.7L, Quadratrc II " Chronic Pain Hurts" -------------- Original message ---------------------- From: Frank Swygert <farna@xxxxxxx> > That would probably be the case in a relatively new transmission, or if the > fluid is thickened too much. Slightly heavier fluid will increase internal > pressure, will improve shifting, and can help an aging trans along for a few > more years. One pint can of STP shouldn't affect 10-15 quarts of trans fluid > that much. > > I used to run engine oil stabilizer (a quart -- the stuff you see on counters > with the crank gears) in my M-35, even shortly after a rebuild. It made a > noticeable difference in shift speed (faster, harder, less slipping). It was the > closest thing to "shift kit in a bottle" that you could find! That said, no more > than 10% should be used. The M-35 holds 12 quarts of fluid, so one quart was > less than 10%. I've run 1/2 quart in my Volvo 960 and my AW4, but really didn't > notice any improvement in those, probably because they are newer, tighter (by > machine work) transmissions. > > --------------------- > Date: Mon, 14 Jan 2008 21:34:48 +0000 > From: Wrambler242@xxxxxxxxxxx > > NIT; thicker fluid will NOT cause auto tran clutches to engage faster, rather it > will slow engagement down and maycause slippage. The fluid has to leave the > space between the clutches before they fully engage. That is why some clutch > plates have the slotted or grooved areas in them, the grooves give space for the > fluid to move to speed engagement. > > -- > Frank Swygert > Publisher, "American Motors Cars" > Magazine (AMC) > For all AMC enthusiasts > http://farna.home.att.net/AMC.html > (free download available!) > > _______________________________________________ > Amc-list mailing list > Amc-list@xxxxxxxxxxxx > http://www.amc-list.com/mailman/listinfo/amc-list _______________________________________________ Amc-list mailing list Amc-list@xxxxxxxxxxxx http://www.amc-list.com/mailman/listinfo/amc-list