73-87chevytrucks.com
73-87 Chevy _ GMC Trucks => Engine/Drivetrain => Topic started by: Stewart G Griffin on February 28, 2009, 07:10:11 pm
-
1) How much is too much in terms of driveline angle being hard on the u-joints?
2) Is it best to try to keep the driveline angle as straight in a line as possible----transmission output shaft as close as possible in a line with the differential pinion?
-
Driveline Angles & Vibration
by Randy Lyman
http://www.ringpinion.com/ContentFrame.aspx?FilePath=Content%2fHowTo%2fGeneralInfo%2f%2fDirveline_Angles_%26_Vibration.inc
http://www.4x4now.com/gt0899.htm
-
PT.2
How short can a driveshaft be before things get tricky?
In other words, what i'm trying to do is get the engine/trans as far back as possible in the chassis and i was wondering how far back is too far back in terms of driveshaft length if that makes a difference. NOTE: the crankshaft centerline will remain as close as possible to stock specs. OR, the crank centerline will be as close as possible to the differential's pinion shaft.
-
Technically you don't have to have a driveshaft, but if the drivetrain is say 10" from the ground and the pinion is 2" and you have a 14" driveshaft, that is going to be pretty steep, so a normal u-joint setup isn't going to work. You need a double cardian.
-
i'm going to try to have the drivetrain output centerline as close as possible to the pinion's centerline. i was just worried about when the suspension moves up and down if having a short driveshaft would pose any problems? i'm estimating the shaft to be anywhere from 12"-20" ish.
-
Stewart, Can I ask...What type of vehicle are you building & how much suspension travel will you need? Lorne
-
Seems like I read somewhere that it depends on what universal joints you run. I looked into the angles a couple years ago for an offroad buggy I was building. I run spicer 1350 universals in that and the general consensus on those was you could run 7*-8* constant, up to 15* intermittant with the right yokes to prevent binding. I wound up going with a CV driveshaft that could run double those angles...but that thing had about 20" of wheel travel and 48" driveshafts front and rear...
on a side note...sounds like you're not planning on much leg room if you're going to set the engine back far enough to make a 12" driveshaft. what are you building?
-
Alright; i'll tell.
For a real bombshell, please go to the 73-87 trucks section and view my post entitled "C-30 SIMPLEX PROJECT."