TH350 Transmission Rebuild Part 1 

@@grand73am good point!

I agree 100%

Thanks for the support! It’s not too difficult. Just take your time. Have fun with it!

Much appreciated! I try to hard to not have this be another channel that leaves you hanging with in answered questions.

Thanks for the support! Instagram is just a way to promote the RU-vid and have fun. Showing how to build stuff is my passion.

Thanks for the support! Hopefully this helps people. These transmissions are super popular. And really pretty simple as far as automatics go. Definitely worth doing yourself.

Thanks for the support!

I’ll have to look. I think I know what you are describing. Let me look when I get home. You can always go to my website and use my email there to send a photo.

@@WarPaintOffroad I did some more research, as well as broke the transmission down, but this notch I was mentioning is indeed intentional, looks like some kind of blowout channel for the transmission fluid but, the reason mine was leaking was the bushing just there around the shaft. Right where that channel sits happened to be where the bushing itself was pressed together, the bushing was blown halfway apart at the seam with the point torn so far inward it was nearly poking the shaft. Being behind the front pump seal whatever blew my bushing out should've been selfcontained but aside from a few metal shards there was nothing that could've ripped through the bushing within it. It almost looks like the channel opening up over the bushing somehow became overpressurized and just blew enough fluid hard enough to rip apart my bushing. The seal itself was still in great shape too, undamaged though there are a few scratches and gouges more with the bushing.. Your videos been super helpful though, I never would've gotten my front pump out of the transmission without seeing where to pry it. That said I've caught hell trying to order a replacement bushing to install on it. None of the hardware stores have it in stock and half of them don't even have the info on it in their systems. Had to knock it out with a screwdriver myself and even with the part number off the bushing, Clevite 01588, i still had to order from amazon myself to get it. My question is though, is that even feasible? Could the little tranny fluid channel in the front plate of the pump come out with enough force to blow in a bushing like that?

Thanks!

Hey there! So to answer your questions…if all tabs are the same…the. It doesn’t matter. But many parts inside this trans will only fit one way. For the valve body…it would be the gasket and the plate. But it’s very easy to mess up. Which is why I usually go to a kit from someone like Transgo that has already done it for you and you know it will be right. They aren’t expensive. And for beefing up the trans, it used to be easier because the th350 was much more available. But it’s getting harder to find parts. Anything g has a breaking point. Tbh, just upgrading the clutches, getting a good torque converter, and making sure it doesn’t run hot…it will handle some pretty good power. The th400 is strong we though. Has a larger output shaft that can handle more abuse. So it’s hard to say exactly what it will handle. Because lots of power driven nicely in the street is very different than lots of power driven on a sticky drag strip with hot slicks.

Hey thank you so much for replying i loved the video ill watch the other parts of this mini series thank you and good luck ​@WarPaintOffroad

I’m glad this will help you. The TH350 can be modified like you have said. But I tend to put it back together the way it came from the factory and the. Use a Transgo reprogramming kit. The TH350 has been around for a long time. And people came up with their own ways of improving its weaknesses. But Transgo has come up with a shift kit that they call a “reprogramming kit” which not only fixes the potential issues…but allows you to customize the way it shifts. I will be putting out a video on that set up shortly.

I've also heard that you can replace one of the sprag clutches with a stronger one out of a 4L60E. I can't remember which sprag is a weak point in the Th350. @@WarPaintOffroad

@@Chuck_S Yeah, I'd like to know more on that mod as well. Cheers