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On the civilian 6.2 the HPCA is engaged by 12v connections on the injection pump til the engine is over the set temp of the thermal switch. It restricts fuel return to raise the housing pressure to give @3 degrees of advance. There's a glow inhibit thermal switch as well. Theory of operation...

Good points. I was just answering the questions posed. IMHO the TH400 is almost a 60 year old design that's very overbuilt for this application. Nobody should have issues driving one for 200,000 miles or more, as it came from the factory, as long as they change the fluid and strainer once in...

Only posted the links to a few oil cooler thermostats, that are really for sale, to prove they aren't a Jackalope.:shrugs::D I was lazy. Those were in the first 2 or 3 google hits. There are lots more than those. Some are more and some are less... Find one y'all like and use it if'n y'all...

While arguments are entertaining.... :popcorn: A little research is often helpful... If you are really worried about the transmission fluid temperature getting too low there's a little invention called a thermostatic bypass valve that's typically been used for engine oil coolers and is built...

Too cold isn't going to be a problem in one of these slushboxes. There's enough energy wasted that you'll be hard pressed to keep it under 150°F while driving unless you're on the Dalton Hwy in the dead of winter. You want to keep temps between 160°F and 180°F while driving. If it drops to...

200* operating temp is too hot. According to TCI you want 150-175*.

Set the IR gun next to you on the seat and run her up to "hot". Pull over on the shoulder immediately and tag the engine etc with the IR thermometer right then.

If the lift pump coasts for long enough to almost re-prime the system... the already warm engine would restart with only slightly more than normal effort because there's fuel in the filter again. Slight and short rough running might be ignored.

Racor must be moving operations to China. Too bad. They were a good outfit.

The GM FM100 is a top loading filter arrangement bolted into the rear of the intake valley. They are used on the 1992-2001 GM T400 CK pickup trucks and the 02-04 Hummer H1 with the 6.5L engines. This link is an expensive new one without the mounting brackets, drain hose, etc that you'd get from...

The top loading FM100 from the CIVVY 6.5L engines is a nice filter unit. I have one on all three of my diesel trucks. They don't leak and the filters are inexpensive and very available.

The 208 would bolt up. The coupler may need to be swapped. Otherwise use a 241 out of an 88-92 R/V GM squarebody.

Could I use a regular 120v AC block heater element for diversion load or is there a 24v DC variant?

I've seen several posts on getting these repaired on the 73-87 section of the 67-72 chevytrucks board. They replaced the webbing too so it was $$$$$. If the clock spring isn't broken and the mechanism isn't a rusted lump... I'd try locking the belt fully extended. Then clean the...

That looks good. Some filter heads like the Racor 400 series have a built in primer pump. I agree they cost $$$. Other than cost... is there any reason not to run a Racor 490?

The TH400 has an electric kickdown switch next to the go pedal inside the cab. http://www.steelsoldiers.com/cucv/3423-kickdown-switch.html Sounds like the switch has failed closed or the wiring is pinched.

I agree on letting the pros handle it. It helps to know what the devil is probably wrong so the shop can't feed you a BS line. With only 40k on the clock you are only dealing with the soft parts that age chewed up. It may not need much more than a good cleaning, flex ring, seals and...

Sounds like you blew out the flex ring. If you have small black pebbles in the governor housing you need to replace the flex ring with an updated EID.

Good to know that the girdles cut down vibration. I may spend some money in the fall. I installed Fluidampers on my M1008 6.2 and my T400 6.5 turbo. It noticeably cut down the felt vibration in the steering wheel. The old harmonic rings were moving. My baseline vibrations could just be that...