Droptoplt1ta

I blew up my 10 bolt rear end and then replaced it with a Moser ford 9. I drove the car a couple times and it was fine. Now, all of a sudden, when i take off, right before the 1-2 shift, something is locking up, pulling the car down and locking the rear tires.

I can idle creep the car around all day... I can also drive normally in reverse with no problems..... The new rear end spins correctly with the driveshaft removed...... Not the parking brake either becase I removed the shoes and still doing it.

Im stumpped to whats going on here.... The output shaft seems to have a good amount of play to it.... I really dont see any cracks in the tailshaft housing.... I need some help here!!!

mrvedit

There is a another similar and current thread:

https://ls1tech.com/forums/automatic...-2nd-gear.html

I also saw your thread about the 1/4 of play in the output shaft. I don't have the experience to know if that is too much, but IIRC, Frank at Performabuilt replied to a similar question last year that even a bit more play is not unusual. Perhaps one of the builders can confirm or correct here.

vwdave

iTrader: (3)

Based on your symptoms it sounds as if first gear is not releasing fast enough and second gear is engaging while first is still engaged.

mrvedit

In the shift from 1st to 2nd, the low/reverse clutch is released and the band is applied. I don't know what "condition" you have if the low/reverse clutch were applied at the same time as the band, but I don't think it is a bind.
Perhaps the pro builder can confirm or correct me.

vwdave

iTrader: (3)

The condition I came acrossed was the transmission had water go through it and caused the car to do that. It was a valvebody problem.

mrvedit

Very interesting; glad to learn that.

Droptoplt1ta

Doubt any water has went though this trans.... Anybody else got any ideas? I think its strange it drove find a couple times since the new rear axle... then all of a sudden doing this???

mrvedit

I don't think vwdave was implying you had water in your trans. He was saying that if the low/reverse clutch binds (or stays engaged) that the entire trans can bind up when it shifts into 2nd. In short, it could be a problem with the low/reverse clutch or the rear planetary.
However, I don't know this for a fact and wish a builder could confirm or refute this.

vwdave

iTrader: (3)

Yup. The vehicle that I worked on had water go through it, not saying yours did.

72blownvert

Anytime the rear blows up more times then not the trans gets damaged as well.I think the problem is your low sprag and race are broken and the center support could be cracked as well. The shock of the rear blowing goes through the driveshaft into the trans and sometimes it does not show up right away. I've seen this plenty of times.Did the rear break launching or under normal driving?

Droptoplt1ta

Happend launching in manual 1st about 5-10 mph.... Its in the trans for sure. Sucks after dumping $2300 into the car for the new ford 9 in rear axle. Also having alot of the car already apart too, to fix that.

Thanks for the replys

Droptoplt1ta

Found the low reverse clutch and its race to be damaged.

zgp

Along with the roller clutch itself most likely. That is a typically of what fails when a rear failure occurs with a 4l60e.

mrvedit

Thank you for posting the results of the final diagnosis. Very informative. Of course, sorry to hear of your troubles.