I have a GMC Sierra 5.3l vortec automatic 4 speed overdrive 2003 short
wheelbase pickup. I put a dubble locker editon possie rear end in with
4.10 ring gear & pinion in. I had a stock rearend and 3.42 gears. Now
when I get to 110mph or a 120mph (off road) I have vibrations in the
floor. I feels like it is in the drive shaft or trans. Could anyone
andvise what this problem could be? Before when stock I did not have
this trouble what is wrong? The gears where set up right and all new
seals put back in. PLEASE ADVISE IF YOU CAN HELP ME!
I'm no driveline expert, but it would seem that at the speeds you are
traveling you are turning many more RPM's with the new higher ratio rear end
than before so any vibration that may have been slight or unnoticeable
before will be mangnified now. Of course you could also have an
out-of-balance driveshaft or tailshaft or something of that order
(especially if you use it off-road at such high speeds).
I'm sure someone here in the group can give you a more expert answer (also
try posting at alt.autos.4x4.chevy-trucks) but it seems to me that this
issue would most likely be user-induced.
Good luck - Jonathan
Thanks, Johnathan I was told today the it might be in the dubble
clutch locking system at high speeds trying to lock up the rearend and
release it. If you hear any more information please advise, I'll check
the other location too on my two wheel drive truck.
There is a product that I believe you should look into. Their website is
www.balancemasters.com and they have units for driveshafts (among other
things). I know about them because I use them on my '95 Harley and love the
results I've gotten. Just as a quick explanation, Balancemasters is a
simple disc that has a hollow rim filled with mercury. When mounted and
spinning (like on a wheel or the compensator and clutch of my Harley), the
mercury acts like a fluid balancing weight and smoothes out any
out-of-balance condition and vibration. Static balancing is only good up to
a certain point, but after that (like at 120mph) then even a little bit out
of balance can be magnified and become a problem.
Read up on their website - you just might want to give them a try.
Cheers - Jonathan
Have your driveshafts balanced because they are not well balance from
the factory. (I do question the claimed speeds involved though because
it is likely that if it does in fact record that speed on speedo, it is
out of calibration))
Mike, look I have several vehicles and this is a vehicle I just started
to work on. If you knew me you would understand! This is a little
project I'm working on to pick up so call "think I got a fast car
person"! Just working a simple street truck for me is hard but the real
horse power I can do! Just check out this site and you will see
www.1320.com then if you can top this advise??? Maybe just maybe you
and me can meet and play with a little pocket money! If you don't have
advise please don't reply, I sometimes like to here from people who
have been their and done that not just what I believe I can't do like
Motorsforum.com is a website by car enthusiasts for car enthusiasts. It is not affiliated with any of the car or spare part manufacturers or car dealers discussed here.
All logos and trade names are the property of their respective owners.