BlackGMC

iTrader: (31)

Yes and No. Have you ever actually measured them side by side?

Driveshaft comparison. I measured what dive shaft specialties said to measure and they sent me this.




My crossmember

timmay208

iTrader: (4)

ill post up mine tomorrow , i have both sitting out of the truck

BlackGMC

iTrader: (31)

OP sorry to derail your thread.


Depending on which year/kind


4l80
4L80EGM Automatic Transmissions | 4L80 | 4L85E | Chevy Automatic Transmissions


4L60

4L60 GM Automatic Transmissions | 4L60 Chevy Automatic Transmissions

timmay208

iTrader: (4)

good info, gonna measure mine tomorrow. What did the driveshaft place have you measure to determine your new driveshaft?

BlackGMC

iTrader: (31)

End of output shaft to center of rearend yoke. Make sure your pinion angle is set correctly prior to measuring.

timmay208

iTrader: (4)

hmmm i have no idea how to set a pinion angle, guessing some kind of shim on the rear diff. Right now mine is fine no vibration with the stock trans/driveline

Ferocity02

iTrader: (59)

I measured the angles of the first driveshaft shaft and the trans. The trans points towards the ground at about 7-8 deg, and the first driveshaft is roughly level. So the working angle of the first u-joint is 7-8 deg. Could be wrong but this seems way too high. Looking at the link below, I should be aiming for 1-1.5 deg at the trans. Correcting this is probably a good place to start.

I can shim up the trans mount, but only to a certain degree because of exhaust-to-floorboard clearances. I'm also using the Belltech carrier bearing relocation kit, which moves the center support bearing up, this could be making things worse, but it has virtually no room for adjustment.

http://www2.dana.com/pdf/J3311-1-DSSP.pdf

BlackGMC

iTrader: (31)

I believe you want the trans pointing down about 6*.

Fast355

What is the pinon angle on the rear end?? Generally speaking you want the pinon angle and transmission angles equal for daily driving and you want the pinon angle -2/4* less for drag racing so that.

LESS is better from an efficiency stand point.

Ferocity02

iTrader: (59)

Why is that?

From what I can gather, the angles of the components themselves (trans, pinion, shafts) doesn't matter. The angles between them are what matters since that determines the working angle of the u-joints.

I called spicer/dana and they said that the angles of the pinion and trans should be within 1 deg of eachother, and the u-joints should have no more than 3 deg of operating angle. This goes against what is said in the link I posted above, which says to make the angle of the pinion equal to the angle of the first shaft.

I really hate driveshafts and angles.