| FAQ |
| Members List |
| Social Groups |
| Calendar |
| Search |
| Today's Posts |
|
#1
10-07-2020, 08:31 PM
|
||||
|
||||
Drive Shaft Tolerance
Can some one tell me what is an acceptable runout on a drive shaft.
Thanks Greg |
|
#2
10-07-2020, 10:44 PM
|
|||
|
|||
|
i would say none. if you have a problem take the shaft to a driveshaft to a driveshaft shop and they will check it for being bent and /or out of balance.
|
|
#3
10-07-2020, 10:46 PM
|
|||
|
|||
|
I had less that .002 wear in the rear bushing of my automatic trans and a new bushing smoothed things out. That was an eye opener!
__________________
"At no time did we exceed 175 mph.” Dan Gurney's truthful response to his and Brock Yate's winning of the first ever Cannonball Baker Sea-to-Shining Sea... Still have my 1st Firebird 7th Firebird 57 Starchief |
|
#4
10-07-2020, 11:21 PM
|
|||
|
|||
|
To make it clearer, if it is not straight and balanced you will have a problem
|
|
#5
10-08-2020, 05:24 AM
|
||||
|
||||
|
Max runout on a steel driveshaft is around .010” at the center of the shaft for factory tolerance. Most good shops get it down to .005 or less.
You would have to be some kind of ninja to get a 50” long welded shaft to .000” across its entire length.
__________________
68 GTO,3860# Stock Original 400/M-20 Muncie,3.55’s 13.86 @ 100 Old combo: 462 10.75 CR,,SD 330CFM Round Port E's,Old Faithful cam,Jim Hand Continental,3.42's. 1968 Pontiac GTO : 11.114 @ 120.130 MPH New combo: 517 MR-1,10.8 CR,SD 350CFM E's,QFT 950/Northwind,246/252 HR,9.5” 4000 stall,3.42's 636HP/654TQ 1.452 10.603 @ 125.09 http://www.dragtimes.com/Pontiac-GTO...lip-31594.html |
|
#6
10-08-2020, 08:00 AM
|
||||
|
||||
|
Thanks for the replys mine had .050. So he is making a new one. He said .015 is the most out of a used shaft.
Greg |
|
#7
10-08-2020, 08:38 AM
|
||||
|
||||
|
Ive seen bent / undersized driveshafts break auto trans cases starting where the bellhousing narrows down near the pump.
__________________
Clutch Guys Matter _______________________________________ 53 Studebaker, 400P/th400/9" 64 F-85 72 4-4-2 Mondello's VO Twister II 84 Hurst/Olds #2449 87 Cutlass Salon 54 Olds 88 sedan |
|
#8
10-08-2020, 08:44 PM
|
|||
|
|||
|
My Trailblazer had a horrible shake at ~74 mph. Rear U-joint was toast. I took the shaft to the local fabricator, they put in two U-joints and put the shaft on the lathe. They said it was .050 TIR, and they straightened it to about .020. Trailblazer was startlingly smooth afterwards. Lasted about two years.
The warp must have come back, 'cause I had the same shake at the same speed, only this time the front and rear U-joints were still good. I slapped a Treasure Yard driveshaft on it after replacing only the rear joint, and it's back to being nicely smooth again. |
| Reply |
|
|
The PY Online Forums is the largest online gathering of Pontiac enthusiasts anywhere in the world. Founded in 1991, it was also the first online forum for people to gather and talk about their Pontiacs. Since then, it has become the mecca of Pontiac technical data and knowledge that no other place can surpass.
Linear Mode
