[Palkojj]

Here are the pictures I just took
http://picasaweb.google.com/Joe.Palkovic/MuncieBlownGears?feat=directlink

We had just pulled a holeshot and wound 1st gear to about 6800, pulling like a you-know-what. Pushed in the clutch and boom.

I haven't done any research yet, but my guess is this is first gear....

I think I need more transmission. The old 355 is running well....

 

[Palkojj]

Re: M21 blown gear photos - waht do you think?

And I know I spelled what wrong...

 

[Palkojj]

It looks like second gear?? Hmmm.....

 

[VinceS427bb]

It looks like second gear?? Hmmm.....

:yes:looks like metal fatigue,

those pesky gremlins have struck you hard and fast

 

[Dave Birdwell]

Kind of unusual carnage....usually much worse. Has it been grinding going into second gear at all??

 

[novadude]

Question for the trans gurus: If you fragged a gear like that, would you just stab in a new 2nd and cluster, or would you replace the whole set? Would the other gears be close behind after that kind of carnage?

 

[Ark68SS]

We had just pulled a holeshot

What exactly does this mean?? You were at the strip and got the jump on the guy in the other lane? Or that you were on the street and did a hard 1st gear launch?? Just wondering,
BillL

 

[Verle]

I would inspect the case carefully before rebuilding this transmission.

Lots of torque can distort the case, and will enlarge the counter shaft holes.

 

[Palkojj]

OK - we were out in the country on an isolated road. It produces enough torque to baby it after the clutch dump and then just get into the secondaries. I'm actually kinda proud (in a weird kinda way) because my 355 has never run this well. It actually scared me a bit, it was all over the road. I'm afraid that I just simply have too much torque now. When I got into 3rd gear on the previous run, the ashtray flew out along with all the change in it - great acceleration!

All the other gears look fine as does the case.

One note - I purchased this used years ago with a new set of synchros and gaskets, etc. It has always had a rising and falling whine in first gear. Not sure if things were loose or what. I am not a tranny guy. I can tell you a lot about 67s since I went through this entire car with my sons. Something was amiss and I'm afraid I found the weak link.

If M21s are good for 400 ft/lbs, I know I am pushing the envelope.

This is a great site, thanks everyone. I am on a budget, but I would love to come up with a 500 ft/lb 4 speed that would retrofit in. Right now I am a 10 spline input (this is a 65). There are so many options out there. I hear that Borg Warners are better if you find the right one. There are a lot of places selling Muncie parts as well.

Oh well - it was a blast while it lasted. It will be back on the road again soon.

 

[Palkojj]

One more reply - it shifted fine in all gears, no grinding at all, just that up and down whine in first.

 

[Palkojj]

And I think the metal fatigue is a probable cause. Hopefully new gears will solve that.

 

[rags70ss]

I would check the pilot bearing..

 

[ls5-70ss]

Atleast you have something to fix. Did about the same thing you did, but was going from 2nd to 3rd at about 6 grand, the trans exploded! Mine was caused by a worn shifter and worn linkage bushings. There might have also been a timing issue between the left foot and the right hand, LOL. Remember these trans are 30-40 yrs old and have had an extremely hard life. Check the case, make sure the counter shaft has not worn the case, fix it and drive. Thomas

 

[Dave Birdwell]

I personally know of no Borg Warners that would take 400+ Ft Lbs. Stick with a Muncie, get a new Italian M22 gearset, and rebuild what you have.