0235SS93

iTrader: (1)

Im getting my h/c/i/boltons lq4 truck dynoed Oct. 22nd. It is a RCSB with 3.73's and a stock steel driveshaft. Ive heard of aluminum driveshafts grenading anywhere from 100-130mph. According to calculations, my truck will do 129mph at 5k rpms in 3rd gear. 5k would really leave alot of power onthe table on a dyno. I was hoping to make some 6k pulls. Does anyone know what's safe on a stock steel driveshaft in a rcsb?

0235SS93

iTrader: (1)

Btw, calculations show that 6k rpm in 3rd gear would be 152mph on my setup.

brent1976

iTrader: (1)

Mines had probably 50 pulls on a dyno for tuning, and 15 at dyno days, and hits pretty high speeds every once in a while. I have never been nervous before.

What are your mods?

fastrt

iTrader: (48)

I had mine balanced just in case. I have been 3rd gear up to 7,200 rpm with no issues.

AKlowriderZ71

iTrader: (22)

Most of the shafts breaking are longer ones, on extended & crew cab trucks. If you start to feel it vibrating during your run, lift.

0235SS93

iTrader: (1)

Wow, you guys made me feel a lot better! Thanks! My mods are LQ4, 243 heads, TSP 224/224-112 cam, pr's, pac springs, NNBS intake manifold/tb, LT's, no cats, Dual 2.5" exhaust with x pipe, Volant Cai, 160* thermo, vette servo and a 14bolt rear end.

silver-mod-o

iTrader: (15)

I would think you're good to go. I'd maybe look into having it high-speed balanced just for peace of mind but theres plenty of guys putting big hp/speed thru the stock steel shafts. Like AK mentioned, the ones coming apart are usually the longer shafts and generally the aluminum ones....

TIM Z

iTrader: (12)

My 3.5 '' steel driveshaft has seen 157 mph on the dyno in 3rd gear.


No probs at all, im glad i went steel and it was half the cost of aluminum.