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Hmm...no shift relay?? Th400 Downshift Switch
Alright, I'm confused (not hard to do on any given day, but even more than usual today). TH400s are supposed to have kickdown relays and a switch on the gas pedal, right? My '90 Burb has neither. Doesn't mention it in the Chiltons book I have handy, but did the ECM control downshift instead?- sandrock
- Thread
- Replies: 16
- Forum: Automatic Transmission
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VSS Signal Question
...what the VSS signal is on the later trucks? As in...is it a 2k or a 4k signal? Does the TH400 use a reluctor wheel, and is it removable/interchangeable?- sandrock
- Thread
- Replies: 1
- Forum: Transmission & Transfer Case
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Sandrocks master plan
I thought I would share with you guys my plans on how I am building up the Suburbans engine. Since the TBI engine had well over 200k on the ticker, I made a command decision to just build up another one to replace it. I settled on using a Vortec-based 350, which as you may already know, came...- sandrock
- Thread
- Replies: 73
- Forum: Engine & Performance
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Newb from OKC
Greetings y'all... I'm not new to wrenching at all, nor I am I new to PCM swaps (I currently have a 1997 Bonneville SSE with a swapped 3800 Series III/2006 Grand Prix 4T65e w/HD 3.29 and a 2005 Impala PCM running the show), but I am new to GM trucks. Anyways, I got a 1990 'burb 2500 that...- sandrock
- Thread
- Replies: 9
- Forum: Introduction
