I broke the ring and pinion at Pittsburgh back in September right off the starting line. I pulled over and stopped before the 60ft timer, rev limiter set for 6800. As you can see it demolished the sprag, rolled the flanges and spit the springs out. I run an aluminium drum and bolt in sprag, but still a mess.

And yes I drove into the trailer and out of the trailer with the broken ring pinion. After replacing the ring and pinion could have drove it, that's why I am saying you have to check after a rearend failure.

Message heard loud & clear.

Agree a zillion percent. I'm not a supporter of the "We're all gonna die if we race a torqueflite" crowd, but, this is common sense. Anytime the motor and drive train lose their load in 1st gear you gotta check. The trans will seem fine puttsying around....but it's not. I remember when that happened, Jim.....This was the instruction we were given in big bold letters back in the sixties, before the fancy stuff was available. Just common sense, paying attention.

Good save! What caused the R&P failure?

This is the second rear end failure I have had and the first one did no damage to the transmission. As you can see the second one destroyed the sprag, I am looking at replacing the rear drum and rear support due to the damage done. You have to check each time, never know when.... it goes to sh$t

I am thinking how I set up the R&P, my first time and it lasted 6+ years.

Its the same with chevys as well, ive toasted 3 rears and turbo 400-s at the same time over the years.

On a 727 to help out on the explosion what is needed steel front drum rear bolt in spray and what else will help out on the explosion

the fact you run one of the "proper" drums may have saved you from finding out the REALLY hard way your sprag got lunched. You move on for another day of racing

curios 9" or Dana ?

It's not a 9"

D60

bought the aluminium drum just for this reason. racerx Dana 60 rear end. The bolt in sprag saved my case or I'd be looking for new one.

No explosion here =, inspected and will replace all damaged componets.

Do you coast it with the engine off at each event? That saved me. Could hear it clicking with the engine off coasting. When it was disassembled the gears looked perfect, fluid looked perfect, until a pattern check. Every 10th tooth had a hard wear pattern. Also had zero backlash (installed at .007"). It made it 425 passes (Dana 60 street gear).
Doug

Didn't Casey just do the same?

would agree a good save,dont need this to happen to ya like it did me

It's a weird feeling when you tear one down and find no damage to the sprag. On one hand, you're happy nothing was broken, but on the other hand you're like, "Dang it, I just did all that work for nothing!"

I agree to pull the trans and check it anytime a rear blows with the 727. My buddies 440 six pack Roadrunner broke some ring & pinion teeth some years back and after he had a shop fix it I remember when he drove it over my house he asked me to listen to the noise it was now making. Which was a scraping noise from the damaged sprag. Course he had to have it repaired. Ron