GMC 3500 Pickup Questions

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Seems the last owner installed two 2 inch tubes running to two mufflers in the rear. WHAT IS THE ORIGINAL EXHAUST TUBE SIZE and MUFFLER configuration ? restriction exhaust issue ?
There is good fuel pressure. is there a fuse that can cause it not to start?
It downshifts to 2nd hear, and if I let up, it will again shift up when I am below 40 mph. Speedometer needle bounces. Speed sensor? Transmission shift sensor? Ideas?
Truck usually starts with no problem then every once in awhile it just does not start. Battery tests fine by evry so often just clicks lights on dash come on but truck does not start... then out of no where do not ...
Greetings and help !; I have a 1990 GMC K3500HD 4WD lifted with a 454 engine. Front brakes tend to jam and heat up when it goes into operational temperature. Already replaced calipers, pads, discs and hoses (custom be...
IT runs then shuts off, won't start for days. Then starts runs fine for days or weeks. Now won't start or run at all. Tried fuel pumps and new batteries local GMC dealer washed hands when it came to fixing it.
I had to change my starter but had to take out slave cylinder to remove old starter and put new one in. Before this all took place the clutch pedal worked perfect. After the new starter was in place, I went into cab a...
I have gone through 5 starts with each starter and then it does not turn over again. could the fly wheel be bent and what do I do now?
Leaking coolant under intake running down back of motor
Just picked up this truck and batteries seem a little weak on start up. Want to change one at a time, so want to change the primary first. Assuming it's the one nearest the starter, but want to confirm that and that y...
I try jumping and using ether but still won't start. Been an ongoing problem, and was getting worse over the last few months. I started by having to jump it, then jumping plus ether. Used to be the problem was in...
Spudders and dies. Dash lights are on but put it in neutral coasting try and start it with no luck. Belt is intact. I've changed the fuel pump relay bad pump. Still not starting. Turns over spudders backfires but n...
I have a 1998 3500 Savannah short School bus that I converted into a vending bus..I drove it for 4 years fine..Last year it started where I have to jump it everyday before I can drive it..Can anyone help me..I do NOT ...
The comp is not throwing any codes, and I've replaced the plugs, wires, distributor, the electronic ignition switch, o2 sensor, crank sensor, cam sensor, fuel filter, air filter, and checked the fuel pump. I'm out of ...
I turn the engen with the fule line diconnect and no fule comes out
following the procedure to start the GM3500 diesel pickup, Letting glow plugs warm up and turning key to start position, everything went dead. No dash lights - No nothing. Dead in the water. any ideas? it only occu...
There is no visible water on the ground and there is black smoke and then white smoke blowing out the back.
I replaced the master door lock switch and that did not help, still all 4 door locks are not working. What besides the master switch could be causing all 4 door locks to not be working?
This part is heating up and causing the truck to not start or start and run for awhile then quit. sometimes it will restart after it sets for awhile
sometimes starts, runs for about 5 seconds then shuts down. sometimes it will restart, sometimes it won't. it acts like a "kill" switch is operating it.You never know when it is going to shut down on you. You can not ...
I've been un-hooking batt. between try's.Has two tank's, how do the fuel pump's work with each tank? What about the transfer pump?
i have a topkick deseal truck that i have the problem with
blown 454 engine being removed. putting in a 350 tbi . what equipment should be transferred to make this work? engine & computer ? just have to figure out how to wire computer for the 350 tbi into the truck right?
the truck started shutting off ,like it was'nt getting fuel,so i replaced fuel in-line filter,worked one day ,then started spitting & idling irratic & shuts off,so i'm trying to locate problem,is it the fuel pump or m...
dash cover has to be removed i don't understand how the dash cover removes so i can replace the headlight switch it appears to me there is a top and bottom to the dashboard covers
Not even a dome lt. batt has full power. I check all cables, looked at fuses is there a fusible link I'm missing, babe behind the F box?