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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...

Couple of questions before anybody can give you accurate info. Are both trucks 4x4? Are they both the same cab & bed configurations? Just how in depth are you willing to get with this swap?

The tech 2 only shows disabled(off) or enabled(on).

Does your gear display show N when you're trying to shift into 4 low? The most common problem I see is bad nsbu switches not displaying they are in neutral. If the tccm does not see neutral, it will do as you describe.

All 4l80/4l85/th400 from 95+ use the same reverse band, and the new style band retro's back to older models(same size, they changed the way the friction is designed). You're thinking of the intermediate band which was changed to a wider band starting early 99(March or May iirc). It is only used...

You're lucky if your speedo is +/-4 mph of actual across it's sweep. These clusters use air cores, and the slightest rfi change will change there reading. You can be going at a steady speed set on your cruise, shift from 4th down to 3rd, and your speedo will go up some due to the tach reading...

There's only a handful of changes between a 4l80e and a 4l85e. An extra gear in the planetary assembly's and an induction hardened output shaft iirc. That was it. No clutch changes, no band changes, nothing like that. Hence why it only upped the torque input rating from 440 ft lbs to 450 ft lbs...

Not even close, you're thinking of the Jet 6 speed which used a 4l80e trans, different planetaries to change the gear ratios, modified valve body to add a dedicated overdrive solenoid, and an aftermarket TCM to engage overdrive between gears to split them. Only 5 of the gears were really useful...

The push button was a np263xhd, floor shift was a np261xhd, but the aftermarket catalogs also include the np246.

You got a shift motor for a late model np246. Rockauto I see is very confusing on how they list them. The splined shaft is for the np246, rpo NP8, also know as the auto shifting. The one you need is for a np263 which uses the 2 flats(early np246's also used 2 flats, but have the extra pins for...

I looked through the .bins I found saved from when I dabbled in 6.5 tuning and none of them had the shift timing or desired pressure tables mapped out. I do have multiple tunes for 6.0l & 8.1l's backed by a 4l80e and what your seeing during shifts is pretty close to what they would run. Up to...

When you run into problems with signals from 2 wire magnetic pulse speed sensors, ALWAYS make CERTAIN that the speed sensor wires are twisted pairs. If you run 2 straight wires through the harness you WILL get magnetic interference. I believe GM called for a minimum of 10 twists per foot of wire...

Ok, lets start by getting the correct codes listed. Code 32 is for EGR system failure which means the ECM has detected a problem in the EGR wiring circuit. Code 43 is for your knock sensor. I don't recall if 93 had a electronic spark control(ESC) module or if it ran straight to the ECM, but code...

When did they do this? I haven't updated in years, but mine still has the LMM tables, it's the 11+ LML that was locked out in mine.

For 94/95 OBD1 6.5's with a DS4 pump your options are limited to either an old TECH1/TECH1A with the appropriate chip, a TECH2 with the updated card, or GMTDScan Tech which is a clone program of a TECH1 scanner for a PC, THAT'S IT! There are NO other options unless you feel like writing custom...

Those numbers are not correct. Pressure numbers for shifts top out at 90 as the epc runs a max of 90 psi. So your xdf must have a multiplier in it to convert eoc pressure to line pressure which will not be accurate. And those are the pressures it shoots for while in gear, not during a shift. I...

Everything said about the swap, a 5.7l tbi is about gutless stock, and for what you would spend swapping over to a 5.7l from your 7.4 you could easily buy an early gen 3 lq4/4l80e pullout combo. Change your fuel pump in the tank to ep381 acdelco, cut the LS harness down, buy some dirty dingo...