acbarnfinds

I'm working on my 90 D250 pulled 727 for nv4500. The trans is out of a 1994 2500. bell, adapter and flywheel off 95.


I was just to the point where I was ready to fit up flywheel and realized that something was broken off/ warn out in the center of it. I'm new to these, so please forgive the dumb questions to come. Is the pilot bushing supposed to go in the flywheel? Because right now I can wiggle the bushing that came in the stock clutch kit around in the hole. Any ideas???


Thanks All,


ac

oliver foster

'89-'93 flywheels have a bronze bushing.
The '94-'02 flywheels have a roller bearing.

The flywheels need the right bushing used or you get the problem you have right now.

thrashingcows

The crewcab has a 96 NV4500 set-up, with all 2nd Gen stuff, and it had a bronze bushing in the flywheel.

oliver foster

You can use what every 12V flywheel you have, just make sure to get the right bushing you need.

The stock replacement 1st gen Sach kits come with the bronze bushing.

The stock replacement 2nd gen LUK one come with the roller bearing.

I have used both and also South Bends flywheel and clutch combos on my crew cabs

acbarnfinds

The luk kit clutch kit I purchased came with a 2 bronze bushings, one with collar one without and a roller bearing. Which of those three would you guys go with? That flywheel I mentioned must be the wrong one so I'm going to purchase a brand new luk that will match up with what clutch kit included. Sure appreciate the help.

Ac

Angry Johnny

I would use the roller bearing personally.

thrashingcows

I would use the bronze bushing. The reason I don't like the roller bearings is that if/when the bearing begins to fail and starts to bind up, the hardened inner bearing collar will start to dig into the input shaft on the tranny.

You are far less likely to have any damage to your input shaft with a bronze bushing. Will a bronze bushing need to be serviced more regularly...yup...but it's not as much work as having to replace an input shaft.

j_martin

When I run into an input shaft that's turned in a ball bearing pilot, I have it spray metalized and ground back to spec. Then it's like new except harder.

thrashingcows

But a new bronze bushing is abut $5...

acbarnfinds

Thanks guys.

mknittle

I can't remember having a bronze bushing wreck an input shaft.

j_martin

Well, if your input shaft is wrecked by a ball bearing, you can have it metalized instead of buying new and have a better shaft. Then put in a bronze bushing.

If you drive the truck like a truck, you should never wear out a clutch. TO bearings and pilot bearings will wear out, however. If you have high quality sealed ball bearing pilot, then they'd both need PM at about the same time.

I used to buy Chevy trucks, about '50's vintage, and replace the 10.5 to 11 inch clutch that was shot in them with a 9" automobile clutch. Never replaced one twice, and my left leg wasn't bigger than my right like most truck drivers of the era. One exception if the 1 ton that I built up a special engine for. (hint, it had a 1953 Corvette cam in it and a multi carb intake manifold)

mknittle

LOL I have nothing against ball bearings. I would rather have a ball bearing than a roller but that is just MHO.