Thanks group. My truck is running, insured, and inspected. I however
do have a vague problem, so I will detail all that I know about it.
1985' Chevrolet K5
305CUI SB bowtie power plant
TH700R4 transmission - used from a 1983 GMC Jimmy
NP203 transfer case - original
New front brake line, from proportioning valve to flexible brake line.
New transmission cooler lines (too and from)
Three new U-joints (both on rear axle, front on front axle)
New: oil, tranny fluid (transmission and t-case), new oil filter, air
History of transmission repair:
Last transmission wouldn't shift out of first, and was low on fluid
when I dropped it. The pan was FULL of metal shavings. My guess is I
found the reason why the first tranny failed when I finally found the
source of the leak. It was an "obvious" leak and also well hidden in a
pipe bend out-of-sight. I actually thought the cooler was plugged, and
every once in a while fluid was coming up the fill tube and coating
the passenger side engine compartment. Gary had described this, so I
thought maybe I had a partially clogged cooler.
They weren't bad. I lost some needle bearings in the dirt from the
rear drive shaft, so I just decided to get a new joint, then decided
to change them all so I knew they were all good. They seated right,
have all their bearings, and are full of grease. I haven't gotten the
cardian joint apart, nor have I tried. The truck is currently a 2x4
only - no front drive shaft.
The carb is somewhat sorted out, it still starts hard (like the choke
is pulled open too early) but it opens fully when running, so I don't
get horrible gas mileage. Plug wires look good, haven't pulled the
plugs yet though.
The truck was supposed to have had new tires, rotation, alignment, and
balancing all done by NTP (NPT?) recently before I bought it. There
were a bunch of slips detailing all the work, and some receipts for
things he had done (new fuel pump, the one on the engine). I didn't
look too closely, so I don't know how long ago this was. I also can't
vouch for his mechanical aptitude. I can always tell where he did some
work…missing screws, different screws. When you have 3 bolts on a
torque converter, and 2 different sizes………. That kind of thing.
However the wheels are a deep-dish mag design. The previous owner put
acorn lug nuts on, (or just reused when he got the new rims) and just
tightened them balls tight. Annoyingly, the lug nuts are not even all
the same size. When doing a self-inspection of the brakes, I was able
to get ONE wheel off- that's it. I tightened it back down, and later
on that day I lost all my lugs and luckily not the wheel! Then it was
explained to me why this had happened, so I didn't feel like ‘as much'
of a retard. I've now seen the mag lugs with the shaft that's meant to
go into the rim…. so now I know what I need to stop that from ever
happening again. Right now, there just tightened balls to the
walls…..However I suspect that the damaged rim might not be "self
centering" the way it's supposed to. And here follows the problem.
Vibration. I have a vibration from around 35MPH to 40MPH and from
63MPH(ish) to about 73MPH(ish). It doesn't seem to be coming from any
one area, (front/back, left/right) but just EVERYWHERE…. The driver's
side rear view even rattles…
My guess is a balance problem, since the problem reiterates at
multiples of 2 (with a stronger intensity, and wider speed range). At
any other speed, the truck doesn't shake at all. It doesn't pull off
to any one side, stays relatively straight. It doesn't seem to effect
"drivability" at all. I personally haven't put many miles on my tires,
but I don't see any abnormal wear signs (yet).
I haven't done any driveline work of this kind, and only vaguely know
how things work. And since I want to be the only one to twist wrench
on my K5, I'll have to learn. Looking underneath the truck, I don't
see any blatant problems, and one side generally looks like the other.
I know there is A LOT more to alignment then "looks" though. So my
question is: where should I start looking for the source of this
problem? Does it seem like a balancing problem, and drive line
-The Lonely Grease Monkey
1985' K5 305CUI TH700R4 NP203
"Ignorance is preferable to error; and he is less remote
from the truth who believes nothing, then he who believes
what is a wrong."
- Thomas Jefferson