Search results

Is my TH400 dying?

Hey All, 1988 GMC C3500 RCSW. Truck has 91KMS 5.7L TH400. Recent tune up; plugs, wires, cap, distributor. Truck runs ok but recently have noticed when driving at constant speed the Transmission hesitates/surges... I think. Into second gear at 40KMS (+/-25MPH) the truck RPM jumps without...
- pmndlt
- Thread
- Jan 3, 2022
- Replies: 10
- Forum: Transmissions
Another Gremlin... Time to move on?

Hey All, Quick preamble: 1988 GMC C3500 5.7L TH400, previously had stalling issues while driving; with your help narrowed down to ICM. Replaced - all good... Sort of. 1) Very low oil pressure when in D and stopped (100kpa/14PSI and less - today 0 and still running check gauges on). 2)...
- pmndlt
- Thread
- Jul 30, 2021
- Replies: 26
- Forum: Engine Performance + Maintenance
ISO: Daily Driver Suggestions...

Hey All, Interesting times in the vehicle market up here in the North. Is it the same down there? Have a unique opportunity to get rid of my 2018 GMC now for exactly what I commited and be done with payments. Considering using my 88 C3500 RCLB for work instead, although 2wd is less than ideal...
- pmndlt
- Thread
- May 11, 2021
- Replies: 2
- Forum: Street Chat / Timeslips
Distributor replace/align

Hey all. 1988 GMC Sierra C3500 5.7L. Stalling when warm. Previously thought fuel issue now dealership has confirmed no pulse from distributor at stall. Looking to replace distributor but have never done one. At TDC the rotor is NOT pointing to the #1 cylinder. Plenty of marks on engine and...
- pmndlt
- Thread
- Apr 3, 2021
- Replies: 34
- Forum: Engine Performance + Maintenance
Timing vs. Idle vs. Throttle Spacer WTH?

Hey all I’m absolutely lost. Had this truck for a couple months and have no clue how to get running right. 1988 C3500 5.7TBI. Bringing it home it died at every stop the SES light came on. Code 22. Changed out the TPS, but realized as I removed it PO had installed wrong (tab was on wrong side...
- pmndlt
- Thread
- Mar 4, 2021
- Replies: 22
- Forum: Engine Performance + Maintenance
Timing vs. Idle vs. Throttle Spacer WTH?

Hey all I’m absolutely lost. Had this truck for a couple months and have no clue how to get running right. 1988 C3500 5.7TBI. Bringing it home it died at every stop the SES light came on. Code 22. Changed out the TPS, but realized as I removed it PO had installed wrong (tab was on wrong side...
- pmndlt
- Thread
- Mar 4, 2021
- Replies: 4
- Forum: Engine Performance + Maintenance
1988 GMC C3500 - Suggestions please!

Hi All, Great site - pulled the trigger last week and picked up a 1988 Regular Cab Long Box 3500. 5.7L, 88,000kms. Chose this one since it was in decent shape, kms check out and has the camper special package. Anyone else have a Camper special or a SW 1 Ton? Short term goal is to clean up (fix...
- pmndlt
- Thread
- Jan 5, 2021
- Replies: 5
- Forum: Member Trucks