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1990 Chevrolet 1500 Pickup Questions

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My new gas tank same shape same size has a bigger ring on top than my old tank my old tank got a small ring on the pickup and I drive a V6 did I get a V8 gas tank
I have an 89 Chevy Cheyenne with a sbc 350 in it with a 4 spd manual transmission. What transmissions will interchange with this one.
Happened recently.
Noise when weight shift side to side. Removed tire and when shifting the drum back and forth the noise is duplicated.
I am trying to get my heater working. I have a list of possible problems/ solutions that I'm working through. I just replaced the heater core and was moving on to the heater control valve but can't find it.
changed the switch twice worked as soon as i put in then quit, put in a second switch worked great put it in gear in reverse several times worked good went to put in garage quit working agin
It just happened all at once
I replaced master cylinder. still no pressure. tried to bleed brakes with no fluid coming out. I am at a loss of what to try now
replaced engine with slightly used rebuilt motor from a junk yard.they told me it ran when they got it. so iput it in my truck .useing my distrubitor coil pack tbi carb. i've checked timing gets fuel and spark.only back fires i've retimed it several times yesterday 4/23 /17 i sprayed starter fuild in the carb went to start it and it backed fired but it blew my valvue covers off
I have a 1990 Chevy Cheyenne 1500 heavy half ton with a 3.4l v6 and a granny 4 speed transmission. I want to drop a 70's 350 in it. The transmission and everything else bolts up except I need different motor mounts. Is there a conversion motor mount I can buy or is this something that needs to be fabricated
I have replaced the timing chain also a complete distributor,cap rotor,plugs and wires I have to advance the timing all the way to the firewall to get it to start I have spent $600 just on parts I am really confused and no one can give me an answer I have never had this much problem with getting a vehicle running. I am just about ready to put a 350 engine from my 76 Monte Carlo because I don't want to have to replace the cam . The timing is on top dead center the rotor is pointing to the #1 tower
drop and drain a gas tank
If the O2.sensor is bad how would I know
Replaced fuel filter and pump
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