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Author Topic:   Ever have this happen???
Koolaid
Dirt Forum Racer

Total posts: 82
posted September 24, 2005 07:50 PM  
I've been running an enduro car with a rebuilt turbo 350 and 3.73's all season - tired of shifting halfway down the straightaway from 2nd to 3rd so I bought a "good" used 3.42 complete rearend. Stuck in my axles and mini-spool, thought the backlash was a tad loose, but what the heck, it had been in a factory stock that way for a season and my car is probably 200hp less. Went out and got 40 laps on it and boom, ka chunk ka chunk ka chunk. Took it home and pulled the cover - sure enough half of the pinion teeth were gone. Well that's $150 I just threw away so today I swap the axles back over and put the 3.73 housing back in - not the end of the world. Start up the car and throw it in reverse...... nothing - trans only had 1st gear it appears - can't get reverse or 2nd. Drop the pan on the trans and little baby pieces of metal are in there - nothing huge, but I'm guessing that hasn't made it's way down to the pan yet. Their goes my nicely rebuilt turbo 350. Sigh... well only one more race and I was debating yanking the engine and putting together a different shortblock so I guess now I can do that. I would assume I blew up some planetary gears when the rearend rapidly loaded and unloaded the trans about 5000 times in 30 seconds? Any thoughts? Think it broke the trans case in the process or are they not even worth rebuilding when you loose something more then discs in them? Boy when it rains it pours.

racer17j
Dirt Forum Champ
Total posts: 5390
posted September 24, 2005 10:40 PM  
I wasn't shifting gears when I broke it - had the 3.42's in it so I could run 2nd gear all day long if I wanted to that way. The trans would get shifted from 2nd to 3rd when I was running 3.73's as that was too much gear for the track and engine. Back to 3.73's for the last race and some shifting for the last race!

beachracing
Dirt Forum Racer

Total posts: 94
posted September 25, 2005 09:37 PM  
My car got hit in the left rear axle on the first points night, and it caused the pinion to break three teeth off. Without knowing about, I went out the following week, did well in the heat, and was running 2nd with about 2 laps to go, and pop.....she screamed up to 7400rpms. The rearend had been locking up intermittently, and the transmission internals took a nasty beating. We went through 4 transmissions, 2 sets of rear gears, and finally getting the converter replaced before we got it squared away. It was heartbreaking, especially because my car was leading, or running second when all these numerous problems occured. If you take a hit, or if you don't get the ring, and pinion snug, you will pay for it later. Snug your pinion nut until the play in the crush sleeve is gone......do not go beyond that, and put loc-tite on all threads. Do not use (used) sleeves either! Do not use an impact, use a socket with a large breaker type bar with a helper pipe for leverage, and slowly snug it, and (do not) back off once you get to the point where there is no more slack.

Koolaid
Dirt Forum Racer

Total posts: 82
posted September 26, 2005 05:08 AM  
Beachracing - sorry to hear about your bad luck, but thanks for sharing - always good to put stuff in perspective of "it could have been worse". Now you have me thinking - towards the beginning of the race one kid was diamonding the corners - I tried to pass low and he ran down on the right side of my car - pushed the sheet metal into the cage on the right side and their was scuffing on my right rear wheel - not out on the rim, but in by the "windows" - didn't bend the wheel, but definately made good contact. I wonder if that side jolt was enough to mess up the pinion? Everything inside the housing looked fine - hitting on the right would have taken the ring away from the pinion, but who knows?

racer17j
Dirt Forum Champ
Total posts: 5390
posted September 26, 2005 09:37 PM  
Thanks for the suggestion, but I'm already pretty much maxed out on tire sizes under the car as it is.

Koolaid
Dirt Forum Racer

Total posts: 82
posted September 27, 2005 04:49 AM  
I don't think the shifting had anything to do with the trans breaking. It was a good fresh trans - had regular oil changes this season while I was shifting it - oil was good coming out - not burned up or any bits of metal. Run two coolers in line on it to keep temps down. It was the day I put in the gears that let me not shift was the day I broke it - guessing it'd still be going strong had the rearend not done a number on it.

sideways
Dirt Forum Champ
Total posts: 715
posted September 27, 2005 03:06 PM  
If shifting didnt kill it,it will kill it!!! Plus it aint good on the engine and rear end gears.

[This message has been edited by sideways (edited September 27, 2005).]

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