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Only one TPS, it would be the easiest to diagnose first, just go after them one at a time. however it is doubtful the TPS alone caused all the codes you are seeing but a defective or badly miss aligned TPS can cause "soft shifts" that could be mistaken for slipping. The 85,86,87 codes are an...

I did send a request to Moog about replacement boots

After putting them together and stretching the boot over the tie rod end it does appear it would give at least a marginal seal, at least I admit when I am wrong, But if you look at the way the problem solver tie rod end is cut down on the end there is a very small amount of contact between the...

Sounds like you are way over torquing all of the studs.

As RWH said you should check your glow plugs and find out if any of them are bad, just throwing parts at a problem is not an effective maintenance/repair program.

This lacks allot to sealing up this tie rod end, not even close, not nearly large enough in dia. or tall enough. These ends look larger than the one in your picture. I will take a snapshot in the morning of the boot in place.

These are problem solver tie rod ends.

I don't think that TCM ever had a OBDII port, it had an OBD port which became known as the OBDI port when the OBDII port came out. The OBD port on that TCM has a very limited amount of information, that is why it is mainly diagnosed using the codes and a pressure gauge. The last transmission I...

The boots came in today, they look like they would fit the drag link and the pitman arm just fine but my tie rod ends are much beefier. Time for plan B whatever that is. I got the black ones.

If you live in a fairly large town/city check with the local hot rod guys, the 4L80 is a popular hot rod transmission and shops they deal with would be more likely to welcome you, many shops rather just deal with soccer moms etc.

It also would not be a bad idea to drop the pan and change the filter and look at the pan, if there is a significant pile of clutch material in the pan then it is pretty much game over, a small amount of "sludge" is normal, metallic flakes not so normal. This is a BAD transmission!!

It needs to be diagnosed, you could have sensor failures and slipping and going in and out of limp mode sometimes is caused buy a solenoid/valve failure, both relatively easy to repair. It is best to have someone familiar with the 4L80 to do the pressure testing, they know what the pressures...

The mechanical side is the same as a civy transmission, they should be able to do basic troubleshooting such as putting a pressure gauge etc. The electrical side will likely be foreign to them, all the basic controls are the same but there is no civy port (OBD) to read the TCM but that...

It is normal for it to read high when off as the torque converter sometimes drains back into the pan.

In case you don't have this, if you think it is slipping the first step would be put a pressure gauge on it.

A varistor is a surge protection device, unless it is shorted the circuit should work, if it is shorted cutting one lead should make the circuit work, but if the issue causing the surge is still there it will fry. Most likely if the surge was strong enough to blow the varistor the circuit is...

I would be a little nervous with that drier right next to my face

IIRC the 4 terminal regulator has instructions on how to connect to a 3 wire alt, the wires are tagged so that should not be an issue, ask the dealer you are purchasing it from if it will work.

I am in the planning stages of installing AC in a M998 Basic truck, I will be installing this front evap. And the dual rear fender condensers. I have not decided yet on what secondary evap I will install yet, I have a RedDot unit, I may go with the standard unit that normally mounts between the...

Reminds me a story going around the dealership where I worked in the 70s A guy buys a VW Rabbit diesel, fills the tank and drives to Corpus Christi, around 130 miles, he can only get a little over a gallon of diesel in the tank, drives back to SA and again can only get a little over a gallon in...