Is there anyway to check the input shaft to see if it is bent, and is it hard to change myself, with no expirience in M/T's?

 

I am not sure of any special tool or jig. You can look for twisted splines, cracks, and you can put a dial indicator on it and rotate it to chack straightness. What makes you think it's bent? As far as replacing it, that involves pretty much a complete disassembly. It's the "main" shaft, after all.

This will give you a good idea of what's involved. http://www.dragtimes.com/forums/lofi...php?t3343.html

In general, MT's are simpler than AT's. But if one is familiar you to you and the other is not that would mean I would call it moderately difficult.

Rich

 

The input shaft can easily be removed by first taking off the front cover on the transmission. It's best to do it with the tranny on end. After removing the cover, the input shaft can be pulled out without disturbing anything else.

 

Doh, I somehow read the post as "main shaft".

Rich

 

I figured that was the case. Thanks for posting that link. It's got some useful info and pics.

 

Ok. The main reason I think its the input shaft, is after a dealer installed this transmission, I drove it for two to three weeks, and it start slipping horribly, the shifter vibrated like a albanian hooker. Come to find out three bellhousing bolts were stripped, along with three bolts on my aluminum flywheel, so I took it upon myself to take the transmission the clutch and everything out of the car. The brand new Fidanza flywheel, and Mcleod clutch were toast, with less then 500 miles on each of them. Now with the bellhousing heli-coiled, I had the old flywheel milled, and installed a Perfection clutch from Advance Auto Parts. When I accelerate even a little bit, and pull ever so lightly back or forward on the shifter, it vibrates even worse then before. And when I accelerate above 3,000 rpm it feels like the transmission is going to vibrate my Subframe connectors off.

And I know, I know. I shouldn't have taken it to the dealer in the first place. No need in given me crap about that.

 

It sounds like the flywheel is DEFINATELY out of balance. Do you have a stock motor? Stock motors are externally balanced in the rear by the flywheel and your new aluminum flywheel should have the same setup, otherwise it will vibrate like you are describing. This is very bad for your bearings too, so if this is the case, you need to pull the flywheel ASAP and have it balanced to match your stock flywheel.

 

But I have my stock flywheel installed in the car right now. My aluminum one is still scrapped laying on the bench in my garage.

 

BTW: as I read this again, the lt1 is an internally balanced engine, at least my 96' is. Transmission has been put on the dyno, and the clutch and pressure plate have been tested, next in line is the driveshaft. Yay.

 

It's internally balanced in the FRONT, the hub is neutral. On the BACK end it's balanced by the flywheel or flexplate. Look at your flywheel on the back side, you'll see a weight on it. I promise you it's done this way because i had to have my flywheel weight taken off, and the flywheel was then neutral balanced to work with my new motor, which is fully internally balanced.

 

Oh right, definantly, I thought you meant the whole engine was externally balanced. My bad.