Well I'm phukd. Th400 lost 3rd

[da_raabi]

Well at least now it looks pretty! Also go my first component rebuild done.

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[SlickGTP]

Good start! I'm probably not too terribly far behind you on a transmission rebuild.

 

[da_raabi]

Well I'm kind of on hold right now. I can't really do much else until the rebuild kit arrives. I ordered it about a week ago, and from what I can tell it has yet to ship. I'm starting to get a tad frustrated because I was hoping to work on it over the t-day break...

 

[MikeB]

Way to go, man! Things don't look too bad from what the pictures show. At least the fluid isn't burnt toast brown.

 

[da_raabi]

Well the kit finally arrived yesterday, 15 days later... I was able to get the geartrain rebuilt, but discovered a slight issue with the new front band...

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Oh, and I found my first blown seal in the center support. I'm thinking this might have contributed to my problems?

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[da_raabi]

Anybody ever use the wider 4l80e front band? Since the one that came with the kit is garbage I'm thinking about upgrading. I know it needs a longer servo pin, is that all?

 

[Jrgunn5150]

The front band from 99-up does not interchange to my knowledge.

 

[da_raabi]

OMG WTF??? So I ordered this kit from a site somebody here mentioned, it took 2 weeks to get here - and I had to threaten to cancel the order to get it, the front band came broke, and now I discover it is also missing the intermediate clutch frictions!!!!! What kind of monkey operation is this??? I could have had this done over a week ago!!!

/Rant

On the plus side I did successfully get the geartrain installed in the case. Although it would have been nice if the kit came with new selective thrust washers. I had to reuse the old one at the output that had kind of boogery ears... Nice

 

[74 Shortbed]

Should have replaced that thrust washer with a TH350 pump bearing.

 

[da_raabi]

Has anybody ever increased the number of springs in the intermediate apply piston? Stock, mine had 3 retained with a plastic retainer, but it looks like it could hold 6 or even 9. What effect would this have?

The B&M transkit (which I'm not using, just referencing) recommends the upgrade. I just cannot find any information on what effect it would have.

 

[crazy4offroad]

This is a great article for rebuilding, with quite a few tips for racing/heavy duty use. I used info from a similar article when I rebuilt my TH350.
http://www.crankshaftcoalition.com/wiki/TH400_rebuild_tech

 

[da_raabi]

Well both drums are rebuilt and sitting in bags. Valve body is rebuilt and in a bag. Pump is rebuilt and in a bag. I'm soaking a few of the elements-exposed parts so they will be nice and clean.

I chose not to go with the shift kit's manual low override mod. I know it can be handy in extreme situations, I just don't want to accidentally slide into first at 45mph and blow the engine sky-high. I figure if I need it I can always do it later.

Also went with a slightly more aggressive 1-2 shift setup. I used the orange/red spring combo. I don't want to be chirping the tires every shift. In a dually that's probably not good!

I'm going to do the separator plate mod this evening. I'm using the TransGo plate, and plan to drill:

2nd Feed: .093 or maybe a bit more. This is Range 2 for trucks

3rd Feed: Stock, again Range 2

3rd Accm: Stock, again Range 2

I'll post a few pictures tomorrow of some additional carnage I discovered. Broke accumulator piston, wiped frictions. All kinds of happy noise. I guess 150,000 miles will do that huh?

Waiting on a call back on the clutch frictions. I imagine he's not going to be happy to come in on a Monday morning to THAT voicemail...

 

[Honky Kong jr]

Well both drums are rebuilt and sitting in bags. Valve body is rebuilt and in a bag. Pump is rebuilt and in a bag. I'm soaking a few of the elements-exposed parts so they will be nice and clean.

I chose not to go with the shift kit's manual low override mod. I know it can be handy in extreme situations, I just don't want to accidentally slide into first at 45mph and blow the engine sky-high. I figure if I need it I can always do it later.

Also went with a slightly more aggressive 1-2 shift setup. I used the orange/red spring combo. I don't want to be chirping the tires every shift. In a dually that's probably not good!

I'm going to do the separator plate mod this evening. I'm using the TransGo plate, and plan to drill:

2nd Feed: .093 or maybe a bit more. This is Range 2 for trucks

3rd Feed: Stock, again Range 2

3rd Accm: Stock, again Range 2

I'll post a few pictures tomorrow of some additional carnage I discovered. Broke accumulator piston, wiped frictions. All kinds of happy noise. I guess 150,000 miles will do that huh?

Waiting on a call back on the clutch frictions. I imagine he's not going to be happy to come in on a Monday morning to THAT voicemail...

Get an aluminum piston not another pos plastic one.

 

[da_raabi]

Get an aluminum piston not another pos plastic one.

Already did it. That was one of the issues I found. The OE plastic one had broke a nice ring right off on the shaft. Pretty sure it was doing a whole lot of nothing!

Found a wiped out clutch in the forward drum too. Literally bare metal.

Found 2 broken seals and a whole ton of brittle/stiff ones throughout.

Bunch of gunk in the v/b valves too.

I'm 99% sure this project is going to give me cancer...

 

[HotRodPC]

Them 2 broken seals if you're talking about sealing rings are probably what toasted this transmission. Once you get a fluid bleed somewhere then things start to happen like dominoes falling. This happens, then that happens, causing this to happen and so forth.