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750hp requires dual pumps and many other supporting mods. Who did the harness work as you said you switched from a 5.3l/4l60e to a stroker/4l80e? The tuner should have told you right off it was running out of fuel as the stock 190 lph pump is only good for about 425hp n/a(about 375hp F/I)...

Injectors direct has a bad rep for duramax injectors. 30ml return per bank is way to much fuel for rebuilt injectors. 30ml per bank would be to much for 500k mile injectors. The GM MAX spec is 30ml for all 8 injectors, 4 ml per injector, or 15ml per bank, and at 30 ml max return you can still...

Sorry for not seeing this sooner. I do ALL of my tuning to work with a 100% bone stock TCM. I've seen to many mess stuff up by altering the TCM, so I tend to leave them aline except for small shift point changes. If it was an LML or newer that would be a different story as you can make line...

The 1st guy to do it here also posted it at gmt400 abd a few others, so he could have gotten the info from 1 of a half dozen forums. As to the OP's question, new LCA's do not exist for these trucks, neither stamped or forged. GM stopped making them over 15 years ago and the aftermarket has not...

It shifts hard because the 91-93 EPC used no internal spring, it used pressure on both sides of the controlled valve to control line pressure. The 94+ EPC uses an internal spring to return the valve to wide open when no current is present. There is an exhaust port you must open to install a 94+...

The pan bolt patterns are all the same. Up to 96 they used a shallow filter, starting in 97 the fluid cooler lines changed from both being at the bellhousing to the outlet at the bellhousing, and the return was at the mid point. Around that time they also changed to a slightly deeper pan. So...

1st off, you still need a scanner that can display the tdc offset to do the manual tdc offset with the throttle pedal and key sequence. I know some say obd2 doesn't need the resistor, but I have personnally seen obd2 6.5l trucks code after doing a relearn after so many starts. Not all obd2 6.5's...

$100-$200 is about all a core is worth. The 4l80e is not a bad trans, but it has downfalls. The transgo hd2 is a good kit if you're not rebuilding the trans and the sonnax over run kit really helps to strengthen the overdrive roller clutch in 1st-3rd as well as providing engine braking. The AFL...

If it has the np246 autotrak case, then no, the front driveshaft will take 50-80 foot lbs of break away torque to slip. If it is a np261 or np263 then the front end should unlock. Now 03+ np246 will semi free spin the front shaft.

Your pump is air locked. You have to fill the pump reservoir all the way up, leave the pressure line from the pump to the hydroboost off in a jug, and start the truck and give the throttle a quick blip if it doesnt pump right away, then shut the truck right off and then connect the pressure...

The US shift can do it, but you have to use up 1 of the 4 for 4 low. The dakota digital box is only needed to run the speedo, and you could use the factory vssb for that.

The 92-93 6.5l TCM will NOT work on a 94+ trans. I have posted about this numerous times, 91-93 4l80e's use a different epc solenoid and control strategy than 94+ 4l80e's use. This is why the db2 swap guide said to source a 94-95 6.5l van TCM, but they will not shift correctly in 4low unless you...

All diesel sending units are 0-90 ohms(actually 1-95), but ALL gas units changed to 40-250 ohms starting in 98+(V6's changed in 97). Sounds like somebody put a diesel sender in your rear tank instead of a gas sender. Also keep in mind 98-02 obs truck gas fuel gauges are run through the PCM, and...

Which boss are you talking about that needs plugged? I had my tech2 out earlier, to get into the autotrac tcase, select your vehicle, go under diagnostics, powertrain, and there will be 3 options, engine, trans, or atc, select atc as that is the transfer case.

That is a late 99 build 4l80e, you can tell by it having the mounting tab at the 12 o clock position. Never seen a 6.5l with the top mounting tab before.

89 should be a 28 spline 10 bolt rear axle, don't think they had the f44 rpo available in 89 for 1500's to have a 9.5" 14 bolt. You could get a C1500 from GM with the 6.5l and a 30 spline 10 bolt for a few years. As to the front, 6 lig is 8.25", 8 lug is 9.25".

Your 89 has a th700r4, not a 4l60e. ALL turbo 6.5's came with a 4l80e.

If both trucks were extended cab short beds, then you could just swap the tanks. You can take the metal sender assembly out of the 98 diesel and put into your 89 tank, remove your fuel filter from the 89 and install the 6.5's lift pump. Your 89 will have the light duty front brakes though(1"...

Yup, ALL 1500 pickups starting in 88 were gmt400 body styles, square body half ton trucks stopped in 87. SUV's stayed square body to 91 as well as the 4 door 3500 pickups.

The PCM could care less what your speedo sees, it reads everything from the vssb. Lockup at 50 with 3.73's is about where it should be(3.42's don't lockup until almost 55). The vssb reads the 40 tooth output reluctor wheel, it then converts the 40 tooth per driveshaft revolution AC signal into a...