Search results

  1. S

    The Shock Thread

    I posted a few years ago that I used Rancho 5 -way adjustable shocks front and rear on my 1988 RCSB. Since that post I managed to wear out the front shocks. I installed cut suburban big block springs, and the front shocks just couldn’t control the rebound anymore. I stepped up and bought...
  2. S

    Manual trans option questions

    Sorry- it’s a 2wd, regular cab short bed with a factory 5.7/ 350 V8. I’m still running the TBI, factory ‘7747 ecu with a custom tune by me, Tuned Port (TPI) heads, small cam, and shorty headers. I know the T5 has a sketchy stigma with chevys, but on the other hand the fox body mustangs used to...
  3. S

    Manual trans option questions

    Does anyone know what manual transmission is the easiest to put in? My truck is a factory 5 speed, with everything still functional. I’m just looking for a transmission with better gear ratios. My 5lm60/np3500 whatever it is has a really low first gear, with pretty wide spread gearing. I want...
  4. S

    Digital dash install

    A "burn off"- you mean "burn out"!
  5. S

    1988 5.7 5-speed RCSB

  6. S

    1988 5.7 5-speed RCSB

    I have recently been asked what shocks I used and realized I never wrote the part numbers. All are Rancho RS9000 series 9-way adjustable. They have large bodies, a large shaft, and a dial for adjustments. For the fronts I used RS999337. They are pretty short, so you must have short springs...
  7. S

    Looking to run amp wire on passenger side

    same her, peel back the carpet at the passenger side footwell and drill from the inside out.
  8. S

    Steering box info

    Great information! Thank you
  9. S

    Steering box info

    My steering box has some slop that I'd like to eliminate. It's absolutely in the box. I read that is a Saginaw 800 series, I believe, and that it is a very common steering box. I checked my local junkyard and couldn't find an exact replacement. All the gmt400 series trucks had worn out boxes. I...
  10. S

    Lowered suspension advice

    A 4/6 drop using spindles of any brand, a flip kit of any brand (or home made-easy) and new dropped front springs or even cut front springs will ride damn near exactly like stock. Shock quality will change the ride quality the most. No matter what you do, brand new parts will likely make the...
  11. S

    WinALDL or Tunerpro help

    Have you hooked up a wide band 02 sensor to confirm that you are rich when the ECM thinks you are?? It sounds like maybe you aren't rich, but the ECM pulls fuel and it runs rough until it adds fuel and runs better. Just because a new sensor says it's rich doesn't mean it is rich... I would think...
  12. S

    What brand fuel pump to buy

    Walbro 255 or equivalent. Ive used real Walbros, likely knock off Walbros, and even the Ebay "Kemso 340lph" orange pumps- all successfully with a stock engine, stock TBI. I read the regulator is efficient enough to handle a bigger pump, and apparently it is!
  13. S

    Fuel millage

    1988 RCSB, 350/ 5-speed and 3.08's. Rear tires are 275-30-20's. I got 19mpg at the highest from central Florida to Houston Texas, the worst was like 17mpg, all highway. Stock engine, K&N in the stock filter housing, stock exhaust manifolds with a modified factory Y-pipe that exits to 3", no cat...
  14. S

    WinALDL or Tunerpro help

    "IMHO tuning a "stock" engine will always give you better performance and MPG. Modified engines require it." I totally agree
  15. S

    WinALDL or Tunerpro help

    Is this engine stock or modified? If its stock there should be no need to modify your chip or bin file to run well. The screenshot you provided is a good start, but its a snapshot. Seeing a log would be more helpful. Block Learn Mulitplier (BLM's) are 101, which is rich. That coincides with...
  16. S

    1988 HVAC wiring schematic

    I searched but did not find one.... Does anyone have a schematic for the HVAC system on a 1988 c1500? I removed my whole dash to change the AC evaporator, put it all back together and my blend doors are not working. The fan blows and changes speeds but I am stuck on dash vents (no floor, no...
  17. S

    At my wits end with high idle issues.

    Did you try the re-learn procedure for the IAC? https://www.thirdgen.org/forums/tbi/605542-iac-reset-minimum-idle.html Do you have any stored codes or check engine lights?
  18. S

    Fuel gauge always full

    I had a similar situation, where I had recently replaced my fuel sender, than shortly after I replaced the pump. A couple weeks later, the gauge was stuck on 3/4 tank and wouldnt move. I finally tore it apart and found that the little float arm fell out of the sender and was just bobbing in the...
  19. S

    1988 5.7 5-speed RCSB

    I bought a Soundstream brand alarm, remote start, and keyless entry for like $40. I used some ~$5 door lock actuators, also from ebay. and wired it all up. I did go to the junkyard and got some wiring "boots" from the cab to the doors from a similar year C1500, and had to dril a pretty good...
  20. S

    1988 5.7 5-speed RCSB

    I have been driving and working on the truck still. Some recent work I have done is diagnosing an irritating intermittent problem where the truck would instantly lose serious power, briefly, and return to normal almost as fast. It rarely happened at idle, but if it did the truck would stall. I...
  21. S

    1988 5.7 5-speed RCSB

    Sorry so long without any updates.... Ive had a few people contact me about my wheels and tires asking for sizes. I am sorry I thought I posted the info in this thread already but I guess I did not. I have 245/35/20's front and 275/30/20's rear. I honestly think my front tires look too low...
  22. S

    4/6 drop belltech vs mcgaughys

    You can check my thread, Ive got 20's. Details are in my thread about wheel and tire sizes. https://www.gmt400.com/threads/1988-5-7-5-speed-rcsb.43264/#post-1028880
  23. S

    5 speed questions

    Actually I was planning to buy a new flywheel too, so it makes sense that if I just buy everything that it will all work together no matter what it's replacing. Thanks! Do I need to know exactly what 5-speed I have to get a new front seal for it? Or do all the possible variants use the same seal?
  24. S

    5 speed questions

    Oh and thank you for the shifter removal instructions!
  25. S

    5 speed questions

    Well I guess I'm stuck until I take it apart. The truck was originally a 5.0 and a 5.7 was put in by the previous owner so I'm really not sure. I guess I'll have to measure before I buy a new one. Does anyone have any recommendations for a clutch? My 5.7 is 100% stock besides the exhaust and...

Latest posts

Members online

Total: 1,378 (members: 26, guests: 1,352)

Forum statistics

Threads
64,253
Messages
1,389,890
Members
51,246
Latest member
robert2386

Share this page

Top