we just had the pleasure of buying our camaro one week ago.it has a 350 pushing 300 horse we have a muncie m-21 trans.the tires needed rotated and we ask them to check the u-joints and were told we needed new ones.about 12 miles after this ,the front joint cap came off now i have a muncie with a bad cracked case and they say it did'nt come from that happening.my question is can it happen and where can i get the info to back me up.any help will be greatly appreciated.

Insurance companies use Mechanical Evaluators, or Investigatiors, that help determine the cause of things like this.
Ask you insurance man for a list of names.

If you belong to an auto club like AAA they may be able to mediate it.

I'd talk to the shop and see if they would agree to go by what the evaluator says.
If they don't, tell them you will hire the Evaluator and then take them to small claims court. If the Evaluator says it's their fault and they loose in court they will have to repair the car, pay the Evaluator, and court costs.

It's fairly obvious to me the cap should not have come off after they worked on it and the case cracked as a result of the lost cap.

Thanks for the help. The truth is the place where we got the ujoint work done already said it was their fault, but didn,t want to take blame for the crack in the casing, although the casing was perfectly sound before we had ujoints put on, we were wondering if you know of anywhere there might be a muncie 440 rock crusher tranny, I know that it will be hard to find. Please if you can help please let us know thanks Mark

You want to buy a new tranny , or just change out the case? I have a built M-22, new gearset, everything new insides. It's a '68 dated case with dual plugs, ready to go. Email me for a price. Also have several ' 70 - up ones with fine spline input/ turbo 400 outputs, they are all dated ' 72-74. Also other rebuilt Muncies available.