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  1. Edmduncan

    5.3 lm7 to a 4l80e whats needed?

    Dropping a 5.3l lm7 into my 1991 c2500 that has a 4l80e factory. I've read I may need a adapter coupling for the shaft on yhw flex plate but do I need a dished flex plate as well? I've been reading conflicting information and some say it will bolt right up with just the adapter and others say...
  2. Edmduncan

    1991 tbi fuel pressure drop

    Have trouble keeping the truck running , cranks but won't start unless push peddle half way then catches but dies even when warm if foot comes off gas. Tested fuel pressure with pressure tester just before fuel filter. Turn ingnition on pump pressures up to about 12psi, then pump stops as normal...
  3. Edmduncan

    Under 8500 tbi vs over 8500 tbi

    Can anyone tell me why the vacuum lined on the two tbi units are in diferent configurations? Can they be swapped? If I have a over 8500 tbi unit Can I swap it for a under 8500 tbi unit?
  4. Edmduncan

    Tbi vacuum hose location variance.

    Question about tbi vacuum hose location variances. What is the reason for the diference in layout of vacuum hose locations between tbi units for under 8500lbs and over 8500lbs? I currently have a tbi froma 1991 c2500 and picked up two used tbi units where the vacuum lines are a located in a...
  5. Edmduncan

    Towing and sucking gas like crazy.

    ideas from the group. Truck= 1991 C2500 Silverado. Trailer package, 5.7 350 tbi with tbi riser plate and 4l80e trans. 120 Ltr tank. Pulling 5200lbs travel trailer and about 1000# in the box of gear. I only pull in drive, I dont tow in od. Engine is strong, transmission has cooler and shift kit...
  6. Edmduncan

    1991 c2500 , can it tow 6000lbs trailer.

    so in an effort to come to the experts and the people that have real world experience I'm asking the question. I have a 5200lb dry travel trailer and the truck is as follows. 1991 C2500 350tbi with Z82 package, dual battery, trans cooler, heavy rear leaf springs. 4l80E trans, with shift kit and...
  7. Edmduncan

    Whats wrong with my 91 C2500

    Wondering if someone may have had a similar problem. So had a problem pulling out travel trailer, Have a 350tbi with 4l80E transmission, 3:73 rear. Problem is : Only when pulling the trailer the truck will get up to 110kmh then slowly drop down to 100kmh and thats where it will hang and will not...
  8. Edmduncan

    New front shocks, feels like tires are bouncing.

    just changed out the front shocks on my 91 C2500. It feels like wheel bounce now on the highway even though visualy the tires are planted. Is it possible my ball joints are going or could it be something like the ujoints or the pilot bearing between the first and second drive shafts. Im kinda...

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