Sun gear shell broken... again

[Blue Bowtie]

Originally Posted by wafrederick

"The Beast" sunshells do break too and I know of one transmission shop that finds this.The teeth also strip out once a while and I have seen this.

I haven't seen them split/torn at the hub, but I've seen them stripped. The China "Beast" will strip. The TranStar (Cleveland, Ohio) sun shells do not, and the thicker end of the shell should not twist out. You'll pay about $40 for a stock replacement, about $50 for a "Beast" forged of the finest Chinesium, and about $85 for the TranStar sun shell. However, after doing the math, the TranStar shell is a lot cheaper. The original shell in my Astro lasted 61K. The second shell (imported "Beast") in my Astro lasted 40,000 miles and two years. The one I installed two months ago is the TranStar A74624A. I've installed those in 700-R4s and 4L60s behind some fairly stout engines and they've lasted for hundreds of runs at the track, plus daily driving.

I have one more Asian "Beast" in my parts stock, and that will be the LAST one. I'd give it to you, but I don't want anyone upset. Really, you don't want it unless you're desperate and don't plan on keeping the truck for more than 30K miles.

As for the noise, make sure the drive shafts are installed correctly. The front one is flanged and should have been matchmarked for balance upon disassembly so it could be assembled in the same orientation. Verify the transfer case is filled, mounted squarely to the trans tail housing adapter, and is mounted on the crossmember. As previously advised, torque converter, pump, and everything in the transmission ahead of the 3-4 (input end) clutch should vary depending upon engine RPM, not road speed. If the noise doesn't vary between 1st or 2nd and the rest of the ranges, there shouldn't be a real problem. The front (input) planetary will vary between D and OD, so that really only leaves the low-reverse (rear) clutch stack and output bushing. I'm guessing the noise is external to the trans.

[AlphaCrow]

I just figured out it goes away momentarily when I make a left hand turn or curve going 30mph+. And when I hit a bump that lifts the blazer up a bit.

Someone mentioned about the turning and 30-40 mph. What causes that?

Thanks

[MT-2500]

Originally Posted by AlphaCrow

I just figured out it goes away momentarily when I make a left hand turn or curve going 30mph+. And when I hit a bump that lifts the blazer up a bit.

Someone mentioned about the turning and 30-40 mph. What causes that?

Thanks

Read post no 8.

[AlphaCrow]

Thanks. Sorry about the extra posts. Just so dang odd that prior to tranny work, no noise. Instantly on pick up, loud noise. Even passengers notice it that ride with me often.

[MT-2500]

You are welcome.
Have you found it for sure yet?
Or got it fixed?
MT

[AlphaCrow]

Sigh, same thing

[AlphaCrow]

Hi again. Had tires criss-crossed rotated (they're marked, know they were done) a few days ago.

Noise is exactly the same. Goes away when turning left or when hitting bump that car is light on the wheels.

Noise starts as loud, deep hum and gets louder with MPH. Goes through all speeds, does not change with gears.

I suppose it could still be the tires, though I see no cupping and they're still very, very new. Plus they were dead quiet before.

Asked tranny shop about it, they have no clue what is causing it, off hand.

Could it be a bearing issue? Just seems unlikely to be a tire wear.

[MT-2500]

Originally Posted by AlphaCrow

Hi again. Had tires criss-crossed rotated (they're marked, know they were done) a few days ago.

Noise is exactly the same. Goes away when turning left or when hitting bump that car is light on the wheels.

Noise starts as loud, deep hum and gets louder with MPH. Goes through all speeds, does not change with gears.

I suppose it could still be the tires, though I see no cupping and they're still very, very new. Plus they were dead quiet before.

Asked tranny shop about it, they have no clue what is causing it, off hand.

Could it be a bearing issue? Just seems unlikely to be a tire wear.

If noise changes on turning check wheel bearings.