Waiting on some 4.30 gears

**darnie1987** · 08-31-2011 09:20 AM

Originally Posted by farmtruc

tune is already on the way.

just a side note, be careful at high speeds in 3rd and 4th, those gears will make that shaft spin very fast.

im thinking of getting 4:30's or even 4:56's soon i have a 33" tire would i have to worry about how fast mine spun as well. i dont take up as high anymore as i usto just food for though neways?

**farmtruc** · 08-31-2011 09:24 AM

you never know with driveshafts. i've seen stock ones break at 100mph with 3.42's and some live up to 140mph with 4.10's.
GM's driveshafts aren't meant to spin as fast as we make'm, hence speed limiter. Yes there are many out there going past the shafts critical speed, but you never know until you try it.

**darnie1987** · 08-31-2011 09:34 AM

ya true... maybe ill have to look into a aftermarket one if it does?

**farmtruc** · 08-31-2011 10:06 AM

i've used a lot of different companies and i haven't had one failure with http://www.driveshaftspecialist.com/

they made the one for my track truck and after they made zach's 5" (4.56gears w/ 6speed auto) with no vibe and no failure, that's proof enough for me.

**Green Machine** · 08-31-2011 10:21 AM

Originally Posted by sloCaddy

3.73 stock, i figured 4.10 or 4.11 wouldn't be enough of a difference. my wheels and tires are really heavy and i really need a little more rpm on the highway to cruise 70-75 without a lot of down shifting. also in theory should be a little easier life(whats left of it lol!) on trans. and of course this decision had nothing to do with wanting to be able to roast the tires

What rpm are u at going 70?

**sloCaddy** · 08-31-2011 11:51 AM

Thanks for the warning, hopefully I won't reach the limit of driveshaft.
With the 3.73's I was turning about 2100rpm's

**Green Machine** · 08-31-2011 12:01 PM

Originally Posted by sloCaddy

Thanks for the warning, hopefully I won't reach the limit of driveshaft.
With the 3.73's I was turning about 2100rpm's

What about now with the 4.30s

**sloCaddy** · 08-31-2011 12:35 PM

Originally Posted by Green Machine

What about now with the 4.30s

Haven't had on the highway yet, and ill need to install retuned pcm for accurate mph.

**Green Machine** · 08-31-2011 12:45 PM

Originally Posted by sloCaddy

Haven't had on the highway yet, and ill need to install retuned pcm for accurate mph.

Let me now when u do thax

**sloCaddy** · 08-31-2011 01:06 PM

Also my drivers side wheel speed sensor is leaking, could I just pull it out and use sealant? any other ideas besides replacing?

Thread: Waiting on some 4.30 gears

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