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  1. 91babyblue

    Dynomax universal ultra flow 17519

    green at this exhaust thing. You guys are good at this 1000 times over. I got 1991 gmc 5.7. Can I put Dynomax ultra flow muffler 17519 on my stock exhaust with cat still on?. I will there Be issues with dash engine lights?.. and how about the sound?. I know it’s...
  2. 91babyblue

    Engine sound cold

    O degrees in garage. 5.7 litre. When I start it cold ,after 30 seconds , I hear a low grind sound . Both sides I hear it. So I figure it’s in middle of engine. I’d record it but it’s not loud enough to hear. As engine is turning , it’s like a churning sound .. hard to...
  3. 91babyblue

    225 inch tires on obs

    just want opinion on this . do some people run this smaller tire on a 2wd. or is this size too small. I seen that some did come with this size. the smaller tire look
  4. 91babyblue

    Trans filter oil seal delimma

    Changing filter in 1991 4l60. As I removed the pan, filter came with it. Probably from the weight of oil inside filter etc. the o-ring was stlll up in hole. I tried to put up old filter back .it seemed loose. Probably why it fell so easy. Is that o-ring up stuck in hole a...
  5. 91babyblue

    5.7 front engine leak

    Have leak in front of engine. Would it be lower part of pan gasket or front seal?? If it leaks in this area.
  6. 91babyblue

    Clunk noise

    This is off my 91 Sierra. 1500. Rear ended I think is I think the high one 310 factory one. This is not posi When I turn the wheel back and forth lightly it makes a CLUNKING noise. Is this somewhat normal I’m not running no high performance on this. My truck...
  7. 91babyblue

    ac clutch does not engage

    I got truck in garage around -10 or so with doors open. its a 1991 5.7 . while running I press the ac on inside the cab. all I see is ac blinking on and off. I am trying to engage the clutch. is it possible it is too cold to engage the clutch etc? I somewhat read it has...
  8. 91babyblue

    radiator fan

    rookie here. got 5.7 in my 91. is radiator fan clutch driven? or is it turn with engine. I can turn the fan by hand freely when engine is stopped . not used to this.
  9. 91babyblue

    S on diagram

    What is these s202,s206,s203. I think the c means connector. What does the S mean. And what’s in the wire in that location??
  10. 91babyblue

    hood insulation

    I seen some without hood insulation. is that ok??
  11. 91babyblue

    Bookmarks

    I put a bookmark yesterday on a favourite .dont remember how or how to get to it??
  12. 91babyblue

    Miles per gallon.

    Is USA mpg different than Canadian miles per gallon. As I remember gallons are smaller in USA. So if a 5.7 is at 13 mpg , is it rated more mpg in Canada???
  13. 91babyblue

    Trans pan removal

    I got Sierra. Trans is that 4160 one I think. There is the back 3 bolts. Cannot remove. Unless I take tranny brace off. Am I correct ?? Want to change oil etc. most likely have to brace it io too ?? Yo be on safe side. ??
  14. 91babyblue

    Tire size

    I got 91 slx fsctory rims What the factory tire size. Sticker was removed behind my door.
  15. 91babyblue

    Purchased 1 month ago

    Got this 91 gmc short box . 350. Body rust is a ten. None. Quite happy. 150 k. Seems like it’s tight. Just joined this forum. Bought this truck if was -30. Seller drove it to my place. Must be reliable. Lol.
  16. 91babyblue

    Under hood light.

    I got 91 gmc. What’s that light on left hand side fender under hood. It also has some crank on it??? What is all that ?

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