Drive Shaft speed/vibration

[1jeep4me]

I have been driving Daisy a bit today and with all the insulation/peal and seal/ radial tires/ etc. I noticed a drive shaft vibration at around 73-80mph.

I know with these older rides that these speeds can be pretty high.


28.5-29.5 inch tall tire/ 3:73.1 Gears TH400

[3rdelement]

yours goes that fast? :eek:

[J20 project]

So the question is??? I'm guessing you want to know what it might be, right? U joints, splines, or bent shaft..check them out. Or tcase wear...
J20

[1jeep4me]

Well its a very slight vibration and goes away at 80.

I was thinking u joints.

Just looking for an opinion

[3rdelement]

well have the tires and wheels checked, then i would go and check the u joints, then maybe check your front rotors(if your year has them) then see if the drive shaft is in balance.

[1jeep4me]

Its old iron brother, 1970.

new brakes/ new tires/ Bearings repacked.

It only has 42k miles on it,

I will make a pretty good assumption its the u joint/ stiff and dried up grease. Wont be a problem putting another one on.

[CJ the noisemaker]

You can go 73-80 with 3.73 gears?

I got up to 82 MPH on my last engine with 3.54s, and that's when it maxed out.

[hookedup50]

I get that vibration and it goes away after 70ish. I have only taken it to 85 on occasion as it is not a sports car. I know it is my U joints and my question about this is. I have a 88 GW that I saved the driveshafts with new U joints installed. Can I use them without causing another problem. I always mark location when taking driveshafts out, because I always read that it is necessary. I am not trying to Hijack this thread, but have same problem. Thanks in advance

[1jeep4me]

Yes you can just dont confuse the caps. I really like u joints that can be regreased and rebuilt.

Would I? No. Reusing old parts that i didnt buy new is a big no no.

[hookedup50]

I installed the ujoints onto the 88 driveshafts and drove about 300 miles before cracking the frame on a stone wall on a ice patch(not in 4wd at time). Can I transfer driveshaft with new u joints installed to my 89. Or should I get new U joints and Use the 89 driveshafts. Trying to cheat here. Thanks in advance.

[duncanstives]

You should be ok to swap shafts but compare the two just to be sure..

[hookedup50]

Thanks for the advice. I miss driving my rusty old 88GW.

[jaber]

The 88 & 89 should interchange just fine. I took the front shaft out of an 85 GW and put it into my 77 J-10 for the same reason...:D

[1jeep4me]

how many responses? on this post