41TE Assembly, Pt. III

"Urambo Tauro" (urambotauro) 04/04/2017 at 18:00 • Filed to: 41te, automatic transmission, rebuild, blog

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Time to start filling up the input drum with parts.

First, we’ll start gathering some parts for cleaning. The rebuild kit provides a new underdrive return spring retainer (not pictured).

And just look how dirty that underdrive piston was!

I made things a little hard on myself by not pressing the input shaft out of the hub. But I managed to make it work. These rings are “scarf cut”, which lets me open them up and slide them into place. I used some dull dental-style picks to carefully work them into their grooves without damaging them.

Some new o-rings and lip seals go onto the hub. (NOT PICTURED: the large lip seal that goes on the inside of that ring gear. Erm, actually, that’s not a ring gear. It’s the tone ring for the input speed sensor.)

The overdrive/reverse piston (left) and input clutch drum (right) get new seals

This spring gets pressed back down onto the OD/R piston and held in place by the snap-ring.

The input clutch drum now goes inside the OD/R piston

And the input hub slides into them from behind (or is it underneath? Uhhhh, well lemme put it this way: that input shaft ultimately points towards the engine ...which is mounted transversely, of course. So... yeah, whatever. Sideways, I guess.) Aaaaaaanyway...

Now we can bring the assembly over to the spring compressor and weasel a snap-ring in there to hold the input hub on

LEFT: The underdrive piston goes in, then this big ol’ return spring. RIGHT: This hat-shaped spring retainer has a molded seal built-in around the “lower” edge, but it’s a tight fit into the underdrive piston...

With the pistons finally aligned and seated, this snap-ring holds the big return spring down, and we can release the compressor

*whew* That is one tough spring! Alright, that’s enough fun for today. We’ll fill this drum up with clutches on the next post. !!!error: Indecipherable SUB-paragraph formatting!!!

NojustNo > Urambo Tauro 04/05/2017 at 09:47

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after seeing you tear this down I can understand why transmission rebuilds are so expensive.

If the transmission ever goes out in my G35 it’s just getting a low mileage used replacement to avoid all that. So far at 131000 miles it seems to be shifting solidly and the fluid is still clean (knocks wood).

Urambo Tauro > NojustNo 04/05/2017 at 14:39

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One thing that I’ve learned about rebuilding is that it’s not really hard; it’s just time-consuming to get everything right. The hard part is wrestling it out of and back into the car.

That said, I don’t know if I’d be willing to go through all the trouble of installing a junkyard unit without opening it up and going through it first. Like you said, it’d at least have to be low-mileage...