Since you're talking about Life-Like and Tyco cars, did you convert them to body mount from truck (Talgo) mounted couplers? If so, that will make the couplers to high right from the get go. You can use the low offset couplers as others have stated, put a shim between the coupler box and body to lower the coupler, or shave down the bolster to lower the car. The older truck mounted coupler cars rode high so the coupler would clear the body so lowering the car would make it more accurate.
Fully concur with getting the Kadee height gauge, even straight out of the box, newer cars are not guaranteed to be correct.
Rick Keil
First decide if the cars you converted are too low or the other cars are too high. For this you need a gauge to measure coupler height. Kadee makes one. The NMRA gauge has a coupler height slot. Using the NMRA gauge as a standard I cut a pine block to just the right height, mount the block on the end of my test track, and screw a coupler to the pine block. Presto, a zero cost coupler height gauge. BTW, if you don't have the NMRA gauge, you ought to get one. It will check track gauge, wheel gauge, and turnout clearances. When you have derailments, the gauge will let you pin the problem to the track or to the rolling stock.
Many cars need adjustments to get the coupler height right. For instance all the legacy Athearn "Blue Box" cars need a washer under the tracks to jack their couplers up to standard height. Number 6 flat washers from the hardware store fit just right.
David Starr www.newsnorthwoods.blogspot.com
Kadee has a conversion kit for them. I used them on some of my Life-like cars I had.
Body-mounting is the way to go, since IMO, it's actually cheaper and less time-consuming.
Vincent
Wants: 1. high-quality, sound equipped, SD40-2s, C636s, C30-7s, and F-units in BN. As for ones that don't cost an arm and a leg, that's out of the question....
2. An end to the limited-production and other crap that makes models harder to get and more expensive.
Another thing to consider is that compared to many other brands, including the newer Bachmann Silver series, the old Life Like and Tyco cars are pretty lousy looking. Rather than spend a bunch of money figuring out how to convert them, I'd invest in some better quality cars. These are typically engineered to provide proper coupler height without a lot of tinkering, and many come with knuckle couplers already.
Personally, I'd rather have a short train that looks good and runs well than a long train that's unreliable and crappy looking.
You can always build a coastal scene, and submerge those old cars in the water to make a reef...
Lee
Route of the Alpha Jets www.wmrywesternlines.net