75 k20

TOMS97ZJ · May 3, 2025

Picked up this thing.

Got it for cheap in a partial trade.

454 built with a cam, heads, headers, intake, Holley carb etc.

It’s been sitting for a few years but got it started pretty quick.

Starts no problem and idles but dies on throttle. I’m guessing accelerator pump. Don’t have much experience with carbs.

TOMS97ZJ · May 4, 2025

Anyone recognize the axles under this thing?

Corp 10 bolt rear and d44 front?

V30crewcab · May 4, 2025

rear is 14 bolt. front looks to be 10 bolt. 75 MIGHT be a d44 front.

u2slow · May 4, 2025

Looks like a 44 front to me.

'75 is D44 turf, but those are the newer ('78+?) hub style.

Edit: 10b front for reference

chumly2071 · May 4, 2025

Looks 44, and being a 75 3/4 ton, should be thick axle tubes.

TOMS97ZJ · May 13, 2025

Got the carb rebuilt kit in yesterday. That should get it running good again.

Tore all the carpet out and found a couple rust spots but mostly in decent shape.

Where’s the Bible on these things?

Looking for a flexy leaf spring set that won’t break the bank. Found a couple different shock re-locator kits.

77fixer · May 13, 2025

205 transfer case, is that a 4 spd trans?

NorCalJalopy · May 13, 2025

TOMS97ZJ said:
Got the carb rebuilt kit in yesterday. That should get it running good again.

Tore all the carpet out and found a couple rust spots but mostly in decent shape.

Where’s the Bible on these things?

Looking for a flexy leaf spring set that won’t break the bank. Found a couple different shock re-locator kits.

If you find a decent “flexy”!spring kit post about it. I currently going through my 1950 jeepster that’s on a 1970 blazer chassis.

McBastard79 · May 14, 2025

Following for another square body

2 86s · May 15, 2025

Confirmed Dana 44 front and rear FF 14 bolt.

Skinny · May 19, 2025

It's definitely a 44. Doesn't have the 10 bolt ears.

Side note that has the nicest plug wire routing I have ever seen on something in this condition.

Honestly an off the shelf 2 or 4 inch lift spring works very well and will get you a lot of travel for the money. I'd be looking at ORD.

If you are looking more like a chopped up trail truck I think a lot of guys run 52s which require a little modding to make work.

Either way you will be into crossover steering and a longer driveshaft to make it work. I ran 4" ORD springs and the stock push pull steering didn't work while flexed so it's big jump money wise.

TOMS97ZJ · May 29, 2025

How much of a pain is it getting 16” tires?

Found these. Can probably get them for 500$. Not gonna be on the road.

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Found some 40’s for cheap but they are 17’s. So I’d have to find new rims also.

TOMS97ZJ · May 29, 2025

u2slow · May 30, 2025

TOMS97ZJ said:
How much of a pain is it getting 16” tires?

Has yet to be a problem for me.
If the size has a mfr listing, and the shop carries the brand.... shows up within a week.

TOMS97ZJ · May 30, 2025

u2slow said:
Has yet to be a problem for me.
If the size has a mfr listing, and the shop carries the brand.... shows up within a week.

So those 16” double beadlocks would be a good deal. Tires just need to hold air until I get this on the road.

u2slow · May 31, 2025

TOMS97ZJ said:
So those 16” double beadlocks would be a good deal. Tires just need to hold air until I get this on the road.

I'm not dialed in on beadlocks...

You asked about 16" tire availability :homer:

TOMS97ZJ · Aug 12, 2025

Got new wheels and tires so they are all the same finally. 🤣

Transmission has a leak. Anyone know what the box is that it’s leaking from?

Appears to be a thm400 transmission
Pans beat to **** and need a cover for the torque converter.

Carb was shot and my buddy rebuilt it. Didn’t fix anything so I ordered a new edelbrock 750 performer.

Skinny · Aug 12, 2025

That is your modulator which has some o-rings on it. Usually just replace the whole assembly.

But...

The TH400 usually has a vacuum modulator but looks like you have a cable modulator which is usually a diesel thing. I think the HMMWV also uses them. Not sure why a gas engine would have it. So be careful when you look your parts up.

TOMS97ZJ · Aug 13, 2025

Skinny said:
That is your modulator which has some o-rings on it. Usually just replace the whole assembly.

But...

The TH400 usually has a vacuum modulator but looks like you have a cable modulator which is usually a diesel thing. I think the HMMWV also uses them. Not sure why a gas engine would have it. So be careful when you look your parts up.

Here’s a better picture. Looks like it’s just blocked off.

The linkage is for the transfer case.

M92PV4U · Aug 13, 2025

Manual valve body?

Skinny · Aug 14, 2025

Strange

It would shift like a **********er without a modulator. It also would only go up to a higher gear at WOT near redline. So I'm not sure what you have going on.l

Also if it was a block off plate I'd imagine it would be a small plug since the modulator goes into a blank hole and sealed with o-rings. Then it has a hold down tab on the outside held by a bolt.

Weird...

TOMS97ZJ · Oct 26, 2025

Got it solved. Looks like a custom governor cover that uses the cover as a pivot point for the transfer case linkage.

TOMS97ZJ · May 7, 2026

Got it running mostly good. Need to figure out the hack job of a fuel system. Looks like it only pulls from drivers side tank.

Leaks from the switcher valve after it’s shut down. Pump never shuts off.

Timings a bit off but the vacuum lines need to be fixed and the choke isn’t wired in yet.

Got new 1/0 battery cables and a mini starter installed. Fires up stupid fast.

Thinking of tearing off the bed and just going truggy. 🤷🏼

PRP bench seat should be finished soon so I gotta mount that. Thanks Austin!

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