I am looking for a tighter slip yoke bushing or possibly a exact size bearing. I have a Doug nash it hat uses a standard 727 yoke and bushing. I had a bad vibration and the bushing walked out. Replaced it was tight pushing in but loose on the yoke. I thought the yoke might be to worn so bought a replacement and still feels loose. The tail shaft bearing is tight drive shaft has a good balance. It is going trough the traps at alot of rpm shaft is spinning over 11,000.

I never heard of one. Maybe check your rear trans mount.

From a bad experience with out of balance driveshafts, the only company that can spin a shaft at the desired rpm is Mark Williams, as one example of my getting the SHAFT LOL, my Strange engineering shaft was only spun up to 500 rpm , thats as fast as they can spin them, after LOTS of wasted money I call MW & they solved my vibration problems & tailshaft bushing problems

11,000 rpm ?

Sorry brain is not working right today it goes through the traps like 9500 rpm in 4th that is 1.2:1 so 7900 rpm and change not 11000

"Feel" varies with the individual, one man's too loose is another man's OK. Depending on how far the slip yoke extends from the bushing (leverage), it can feel like excessive play but isn't really.

A lot of Mopars have excessive play at the tail-shaft bushing with new bushings installed.

I researched, found and installed a Teflon coated bushing from a 4L60 in my 2004R trans. It also fits Mopar transmissions. I found them on ebay, but not at any of the normal parts houses. Once installed, the fit was perfect. I realize the bushing went into a 2004R, but my Mopar machinist buddy measured and verified it will fit in Mopar tail-shafts too, although it is just a fraction of an inch shorter.

https://www.ebay.com/itm/272938846373

Try one. It's an inexpensive fix for a common problem. I typically felt the slop when lightly on and off the gas when at freeway speed. This eliminated that.

This was an issue for me too. I just ordered a 4 inch bonded aluminum driveshaft with their forged yoke and 1350 joints from them. It wasn't cheap, but it's Critical Speed is nearly 10000 rpm.

Between the old Strange driveshaft and the chattering, clunking Eaton TruTrac being replaced with Dr Diff's new and improved TruTrac 2, I hope to have eliminated my mystery vibration that only occurred from 98 mph on up. My '68's driveshaft is pretty long to begin with.

Does that bushing have an oil feed hole at the top?

My thoughts too, also will the nylon wear the yoke?

No, it does not have an oil hole. It would be easy to drill one, but it may not need it. John, you would know if it a pressure fed or drip/weep hole. I can't imagine they would feed pressurized transmission fluid there. The replacement bronze bushings I got from the local parts store did not have oil holes in them, but the ones from Brewers do.

I'll be pulling mine apart to change the driveshaft, gears and differential, and will check for any unusual wear since I installed it last year. It still runs and feels much smoother.

The rear bushing is drip fed by the capillary effect of the fluid following the spine rib at the top of the tailhousing (red arrow in pic below). The long length of the TF tail (compared to others) makes lubrication back there a little more critical than other brands with shorter housings.

if one were to drill a hole in the nylon 4L60 bushing, would that work for lubrication needs of the slip yoke ?