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  • SN95 4.6L Mustang Tech

Driveshaft?

  • Thread starter Thread starter scupking
  • Start date Start date Feb 9, 2008

scupking

Active Member
Sep 18, 2005
1,186
1
36
Enfield, CT
Feb 9, 2008
#1
  • Feb 9, 2008
  • #1
I'm going to be putting on an FRPP aluminum drive shaft in a few days. I have an automatic, now if I remember correctly I need to use my yoke from my current D/S right?
 
N

Nightstick

New Member
Jul 1, 2007
68
0
0
Feb 9, 2008
#2
  • Feb 9, 2008
  • #2
scupking said:
I'm going to be putting on an FRPP aluminum drive shaft in a few days. I have an automatic, now if I remember correctly I need to use my yoke from my current D/S right?
Click to expand...

Yep. Was gonna do that myself but decided on one of these instead:

http://www.need-4-speed.com/pst.htm
 

fobra559

At least it's more erect and not floppy anymore.
Nov 1, 2007
721
0
0
Lindsay, CA
Feb 9, 2008
#3
  • Feb 9, 2008
  • #3
scupking said:
I'm going to be putting on an FRPP aluminum drive shaft in a few days. I have an automatic, now if I remember correctly I need to use my yoke from my current D/S right?
Click to expand...

Correct. Car should feel smoother after the install. Mine seemed to rev a little smoother and faster with the new DS.
 

scupking

Active Member
Sep 18, 2005
1,186
1
36
Enfield, CT
Feb 10, 2008
#4
  • Feb 10, 2008
  • #4
fobra559 said:
Correct. Car should feel smoother after the install. Mine seemed to rev a little smoother and faster with the new DS.
Click to expand...

Yeah I'm looking forward to that. After the gear change I noticed some vibrations.
 

scupking

Active Member
Sep 18, 2005
1,186
1
36
Enfield, CT
Feb 10, 2008
#5
  • Feb 10, 2008
  • #5
Nightstick said:
Yep. Was gonna do that myself but decided on one of these instead:

http://www.need-4-speed.com/pst.htm
Click to expand...

I paid just over $200 for the aluminum. I did look at the ones your talking about but they are so expensive.
 

CobraRed_96_GT

Active Member
May 20, 2006
1,421
4
39
UCSD/La Jolla
Feb 10, 2008
#6
  • Feb 10, 2008
  • #6
Nightstick said:
Yep. Was gonna do that myself but decided on one of these instead:

http://www.need-4-speed.com/pst.htm
Click to expand...

hmmm cams with valve springs or a new driveshaft.................
 

fobra559

At least it's more erect and not floppy anymore.
Nov 1, 2007
721
0
0
Lindsay, CA
Feb 10, 2008
#7
  • Feb 10, 2008
  • #7
CobraRed_96_GT said:
hmmm cams with valve springs or a new driveshaft.................
Click to expand...

Good Point.
 

Notchbck93

New Member
Dec 9, 2003
422
1
0
IL
Feb 11, 2008
#8
  • Feb 11, 2008
  • #8
scupking said:
Yeah I'm looking forward to that. After the gear change I noticed some vibrations.
Click to expand...

Between the yolk on your rear pinion and the yoke on the back of the tranny you should have a 1 degree difference. If not, shim the back of the tranny and your vibration should be gone.

http://www.drivetrain.com/driveline_angle_problem.html

You've increased the speed of your driveshaft by changing the rear gear ratio; adjust accordingly.
 

joshheat25

Member
Nov 8, 2004
871
0
16
Delaware
Feb 12, 2008
#9
  • Feb 12, 2008
  • #9
Yea my car was alot smoother with the new driveshaft and new rear tranny mount, seal, bearings. huge difference. Going 70-80 on the hwy it's so much smoother!
 

geoffsgt

Member
Aug 7, 2005
176
1
16
Baton Rouge, LA
Feb 12, 2008
#10
  • Feb 12, 2008
  • #10
Notchbck93 said:
You've increased the speed of your driveshaft by changing the rear gear ratio; adjust accordingly.
Click to expand...

Eh? D/S still moves at the same speed... engine speed modified by whatever gear you happen to be in.
 

CobraRed_96_GT

Active Member
May 20, 2006
1,421
4
39
UCSD/La Jolla
Feb 12, 2008
#11
  • Feb 12, 2008
  • #11
geoffsgt said:
Eh? D/S still moves at the same speed... engine speed modified by whatever gear you happen to be in.
Click to expand...

shhhh, logic isn't welcome here
 

Flghtmstr1

Member
Mar 31, 2005
572
4
19
Springfield, PA
Feb 13, 2008
#12
  • Feb 13, 2008
  • #12
geoffsgt said:
Eh? D/S still moves at the same speed... engine speed modified by whatever gear you happen to be in.
Click to expand...

I'm not so sure that's the best way to look at it. For the same vehicle speed, the driveshaft will be spinning faster in a car with a higher (numerical) rear gear ratio. So, on average, your driveshaft will be turning faster after a gear install (unless your driving slows down to compensate)
 

CobraRed_96_GT

Active Member
May 20, 2006
1,421
4
39
UCSD/La Jolla
Feb 13, 2008
#13
  • Feb 13, 2008
  • #13
Flghtmstr1 said:
I'm not so sure that's the best way to look at it. For the same vehicle speed, the driveshaft will be spinning faster in a car with a higher (numerical) rear gear ratio. So, on average, your driveshaft will be turning faster after a gear install (unless your driving slows down to compensate)
Click to expand...

edit: i had it backwards. going 60mph with 3.27's the wheel is spinning at 60 mph and engine may be at X rpms. 60mph w/ 4.10's means wheel is still spinning at 60mph but the engine is at 1.2X rpms therefore the driveshaft is having to spin faster to go the same speed
 
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