I have a 92 Chevy S10 and I have lowered it 5 inches in the front and 6 inches in the back. I put 4 degree angled blocks in the back and put a 3/4 transmission mount spacer in the front. As I drive down the freeway between 50 and 55 mph I get a pretty good vibration. So what should I do? Do I need to Shim up the back more? Or do I need to shim the transmission mount some more? Or could It be Worn U joints?
2006-10-04 14:59:19 · 7 answers · asked by John J 1 in Cars & Transportation ➔ Car Makes ➔ Chevrolet
i own a repair shop,and an easy way to find out is take a strait pencil,and lay it on the yolk,and let it touch the drive line,now measure the distance between the two in the middle where the gap is the largest you can only have 5/8,ths on an inch or less,anything over that and its going to wear u- joint out on it,and it will also vibrate and shake really bad, learned this from an old time mechanic and moon shine hauler a long time ago,and it works well,good luck i hope this help,s.
2006-10-04 15:27:28 · answer #1 · answered by dodge man 7 · 0⤊ 0⤋
all these are correct, except its homework time. youve gotta either use a percent equation like .75Xplane+pinion+4degrees=stock trans plane plus stock pinion or some crap like that. take the diff. and split it like 45-55 percent.(numbers are a guess) so 45 degrees diff in angle goes in tailshaft and 55 on the rear. this should give you closer to a 45 to 50 with a normal load with travel, but the angles need to cancel,plus a slight imperfection to keep the driveshaft from transferring road vib,nois,gear hum etc through the power train. a driveline specialist could give you the numbers off their head, and its more like 47-8 to 51-2 with 1 for the vibes. the 1 is only if the two gear boxes share the same center line.even though they are broken up by driveshaft pitch, noise will try to come through in roughly 2 90 degree zones +- but i dont know and have know real knowledge. also what the previous guy stated about the 5/8 thing is correct because as the gap increases, the angle increases to a graduated scale, making it harder to get correct.
working a u joint will wear it out is a wives tale. holding it still will flat the needle bearings.
i believe that hotrod magazine stated that anything more than like 5 degree uncancelled pinion angle= painful to drive. so 1 degree is fine to let it wobble with a good balance job. more than likely the vibe is either dirty or worn or twisted slip yoke splines if the angles are within like 5 degrees
2006-10-04 20:29:29 · answer #2 · answered by l8ntpianist 3 · 0⤊ 0⤋
the pinion angle is that angle in which the rear end lines up with the transmission via the drive shaft. If this angle is off too much it will put your drive shaft in a bind and cause the vibration...and as you suggested...it could be worn U-Joints
2006-10-04 15:06:24 · answer #3 · answered by Kenneth S 5 · 0⤊ 0⤋
you mite get one of those magnetic angle gages at an auto parts store and compare a stock s 10 to yours...look to see if the difference between the rear end angle and the drive shaft angle is the same as yours...not that the rear end is the same as yours and the shaft is the same as yours just the difference is the same because your truck is closer to level with the 5 6 drop than stock
2006-10-04 15:50:03 · answer #4 · answered by big_t_1_1999 2 · 0⤊ 0⤋
The transmission and the diff should be in parallel. If the trans is pointing down slightly, the trans should be pointing up slightly at the same angel. They should not be pointed directly at each other.
2006-10-04 15:25:15 · answer #5 · answered by the mazda mechanic 4 · 0⤊ 0⤋
i like dodge mans pencil trick .....awsome way to simplify it ....much eaier than any other way i have ever heard of
2006-10-05 13:26:09 · answer #6 · answered by udontno69 2 · 0⤊ 0⤋
make it a lil pickup again --want your *** on the ground go buy a lil turd car.
2006-10-04 20:24:22 · answer #7 · answered by michael_stewart32 4 · 0⤊ 0⤋