driveshaft questions (1 Viewer)

[ferociousfish]

Hey guys! I'm hoping someone can help me out here. I have a 86 Hilux with a 350 chev and T350. Lately it has been making a high pitched 'warbling' sound at around 60km\h, almost like a loose belt sound. If I keep engine revs and speed constant and knock it into neutral the sound stops. I was thinking bearing in the transmission but it was reconditioned only 7000km ago. The sound isn't there all the time, and goes away if I accelerate hard or over about 70km\h. On a different question, I also have a new shudder in the truck when I take off. I recently had new tyres put on (Mickey Thompsons 35's) and had everything balanced (2000k ago) and it was running smooth. I was going to take the rear driveshaft off and run it in H4 with just the front driveshaft to see maybe the rear had thrown a weight or something. My question is are there limits to how far or ast I can run in H4 with only front? Am I going to do any damage to it? Any help would be greatly appreciated

 

[KliersLC]

that does sound like a driveshaft problem. if you are using stock u joints that 350 probably eats them pretty quick. I have had all of my rigs at at least 60 in 4h except the pig, and as far as I know, there is no limit. they do say not to shift on the fly over 55 mph, but thats just a sugg. and not applicable to you anyway. Let us know what you find out.
Good luck,
Dan

 

[tonkota]

I agree. And when you take off, you probly have some bad axle wrap. Even my old mini with the 22R-E had axle wrap, just think what the SBC is doing with those big tires. Look into some type of torque rod, like what is on the front of 85 and earlier trucks.

 

[WristPin]

put the rear axle on a jack. get the driveshaft to turn. see if its out of round. mune is so out of round i get a full body massage at 40 mph. (thats probly 60 km/h.)
you can drive all day long in 4wd. if you had a p.o.s. dodge, that mite be a problem.