Which Driveshaft ?

[dynoman]

While pulling the transmission I started thinking about my stock driveshaft and should I upgrade it . I was looking at these from Dennys Driveshafts . http://www.dennysdriveshaft.com/p21..._3_inch_hd_steel_driveshaft...to_replace.html
http://www.dennysdriveshaft.com/p28..._3.5_inch_heavy_duty_driveshaft_1330_ser.html
Are these adequate for my build or do I need to go with the 1350 series ? Thanks , Sam

 

[Major Nutz]

I would do the Dennys 3 inch. I have the 3.5 and its really close to the safety loop.

 

[salvageV6]

I'm not sure what's up with the for stock HP levels in the 3.5" description?

Here's another alternative rated to 1000 HP.

http://www.sledtuner.com/itemdesc.asp+ic+160-35BGNALUMDS+eq++Tp+

 

[dynoman]

I would do the Dennys 3 inch. I have the 3.5 and its really close to the safety loop.

I was looking at that , it would put it 3/8" closer to the loop than the 2.75" stock shaft . How much room should i have for clearance to the loop ??

 

[Major Nutz]

Can't say for sure but it's closer than I'd like it to be. Just something to think about.

 

[Boost231]

If you go 3" it's close. Just make sure the rest of your driveline and bushings are up to par so it won't hit

 

[fastblackracing]

While pulling the transmission I started thinking about my stock driveshaft and should I upgrade it . I was looking at these from Dennys Driveshafts . http://www.dennysdriveshaft.com/p21..._3_inch_hd_steel_driveshaft...to_replace.html
http://www.dennysdriveshaft.com/p28..._3.5_inch_heavy_duty_driveshaft_1330_ser.html
Are these adequate for my build or do I need to go with the 1350 series ? Thanks , Sam

Sam if your factory GN shaft still has original never changed u-joints and is in good condition there is nothing to be gained IMO. I have seen many stock shafts work well into the tens and beyond, the stock driveshaft is a very durable piece......the splines in the oem yoke will start to twist once you can 60' better than low 1.50's......if the oem u-joints have been changed out at some point then you should upgrade the shaft......and if you do upgrade insist on a chrome moly slip yoke

 

[dynoman]

Sam if your factory GN shaft still has original never changed u-joints and is in good condition there is nothing to be gained IMO. I have seen many stock shafts work well into the tens and beyond, the stock driveshaft is a very durable piece......the splines in the oem yoke will start to twist once you can 60' better than low 1.50's......if the oem u-joints have been changed out at some point then you should upgrade the shaft......and if you do upgrade insist on a chrome moly slip yoke

I'm not sure if the driveshaft is the original , as I am at least the 4th owner of the car . Most of the car has been upgraded , including full billet trans & converter , poly trans mount , HR boxed lower , double adj. upper control arms & rear sway bar all with poly bushings with grease fittings , & air bags . The only thing left is the driveshaft and axles . Now that I have my boost figured out , low 1.5's are easily with in reach ( I went 1.6,s with low boost & old converter ) . Thanks for the heads up on the slip yoke . Sam

 

[whitehot1]

I have had the Denny's 3'' HD driveshaft for over 12 years and has worked great from day 1. Never had a problem with it.

I wasn't sure how well the stock driveshaft would hold up after doing some upgrades and didn't want to take a chance on it being a weak link.

The same reason i installed Moser axles also.

 

[Chuck Leeper]

I use PST, in Clearwater, FL. 727-442-1711
Great service from folks that know what's what on drive line parts. Prices are competitive, and delivery is fast.
Been doing business w/ them for 13 yrs.. They'll get the order on the T/Ls project, too.

 

[dynoman]

I use PST, in Clearwater, FL. 727-442-1711
Great service from folks that know what's what on drive line parts. Prices are competitive, and delivery is fast.
Been doing business w/ them for 13 yrs.. They'll get the order on the T/Ls project, too.

What do they get for shipping on driveshafts? Dennys is 1 hr away & maybe could have it delivered by a friend who lives there.

 

[Undercover87T]

I had a 3in made locally and stepped up to 1350 joints. I have a UMI loop and its close. After seeing a driveshaft let loose on a dyno and go through the wall I felt it was worth it to upgrade. Once you get to the 500whp or 1.50 60ft range it's probably a good idea to consider upgrading the shaft, joints and axles. At minimum install a driveshaft loop.

 

[dynoman]

I had a 3in made locally and stepped up to 1350 joints. I have a UMI loop and its close. After seeing a driveshaft let loose on a dyno and go through the wall I felt it was worth it to upgrade. Once you get to the 500whp or 1.50 60ft range it's probably a good idea to consider upgrading the shaft, joints and axles. At minimum install a driveshaft loop.

Yup , loop is in . Running out of things to upgrade ..... and I don't need help with more ideas

 

[Nick Micale]

The driveshaft itself is not the issue, like was stated in a post above, the yokes and U-joint are what you need to be concerned about.

I have seen 12 and 11 Sec. GN's that have twisted the tranny yoke and broken stock U-joints.

When you are at the 600 HP level, then a new, stronger driveshaft is in order as well as 1350 series U-joints and billet yokes.

Personally I have race "tested" the performance level of drive shafts and their components over the years by spitting out 3 of them on the track, not a good feeling!

 

[Pronto]

What would be the next step up from stock for yokes? I have the solid stock sized U joints.