Pagoda SL Group

W113 Pagoda SL Group => Drive train, fuel, suspension, steering & brakes => Topic started by: jharkin on July 15, 2009, 23:35:15

Title: throbbing sensation under 2500 rpm
Post by: jharkin on July 15, 2009, 23:35:15

after my rear axle was converted to a 3.27, it was running fine till a few days ago when i started to notice throbbing sensation in the steering wheel whenever i am in 4th or 3rd at 2000rpm, or slower. but it doesn't seem to be lugging. it decreases quite a bit when i take it out of gear, and it disappears almost completely above 2300 rpm in 4th.  I'm wondering if maybe the drive train is out of balance?  or wheel bearings, although front were replaced last year, and rear were done with the axle change.   I'll be contacting my mechanic about it but in the meantime does anyone have any ideas?

Title: Re: throbbing sensation under 2500 rpm
Post by: ja17 on July 16, 2009, 02:33:44

Hello,

Make sure no driveshaft bolts are coming loose. Check your wheel lug bolts while your at it.

Title: Re: throbbing sensation under 2500 rpm
Post by: jharkin on July 16, 2009, 14:59:59

thanks for the tips; i checked the lug nuts and they are okay but i noticed the axle end caps are missing on the "new" axle. aren't they needed to keep the axle grease in the shaft?

Title: Re: throbbing sensation under 2500 rpm
Post by: jeffc280sl on July 16, 2009, 15:29:10

Check the slip nut on the drive shaft.  I know of a similar vibration on a 3.27 conversion caused by a loose slip nut.  It was sort of forgotten about during assembly.

Title: Re: throbbing sensation under 2500 rpm
Post by: hands_aus on July 18, 2009, 10:04:34

maybe incorrectly fitted flex coupling bolts.

Happened to my car and one came out in the driveway at home.

Title: Re: throbbing sensation under 2500 rpm
Post by: jharkin on July 25, 2009, 17:47:27

all bolts and slip nut were checked and in good order. replaced the transmission mount and bushings in the steering coupling. problem disappeared.