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Hey guys. I'm looking for a rear pump and discharge pipe for a 301MG transmission. I figured you guys out here would be my best chance of finding these parts. I'm working on a project for the 303M transmission, and this pump just might be the answer. Thanks for any help. Rustystud. Here's some...

I spent today sandblasting parts from that last 303M I tore down (all the transmissions I picked up in Canada had water damage). Actually, it was originally a 302M but it was converted in 1964 with the "A" and "B" modifications. Basically, they added two more clutch plates in the front drum...

Thanks Dave ! I was beginning to wonder if anyone was watching out there.

I'm still having trouble finding anyone who can make up new return springs for the reduction piston. So, I'm debating with myself about reusing the best spring I have and hoping it doesn't break later on. I've spent a bit of money modifying this transmission (machining costs alone have come to...

I'm going to tell you something different from the "Book" about checking runout on the "Governor" . You do not need to have the "Reverse Planet Carrier" installed when you check the runout. In fact it is far easier to have the "Carrier" removed since you can spin the governor freely. This...

Here is that pressure plate and spring I was referring too yesterday. I also have the 1954 model. You can see the difference between a civilian HydroMatic and the Military units "Reverse Internal Gear" here. The Military uses straight cut gears while the civilian transmission uses beveled...

I'm not going to install the "Output Shaft Bearing Support" just yet. The "Reverse Internal Gear Assembly" can get "stuck" and not release. In later HydraMatics (1952) GMC fixed this problem by installing a "pressure plate and wave spring" to push against the reverse internal gear releasing the...

I'm still working on installing the back half of the HydraMatic. After the snap ring is installed, you install the "Rear Planet Carrier". The Planet carrier butts up against the snap ring you just installed. Here I'm installing the "Reverse Internal Gear Assembly" and the "Reverse Clutch...

Here's another shop note. I've been tearing down another 303M transmission while I'm waiting for parts from the machine shop again. Here's a classic example of why I always take out those pipe plugs on any transmission. Those passages can get filled with gunk just like these pictures show. If...

Make that four output shafts missing that bushing. I truly believe this is the "smoking gun" on why these HydraMatics fail so soon. Without that support for the input shaft, it allows that gear to "flop" around and without that bushing oil flow is unimpeded and just blows out of the shaft. That...

That small bushing I found missing on those three output shafts can be purchased at "Fatsco" . Here's the part number. H7-6 . There phone number is 1-800-524-0485 ext. 102 (Steve)

I haven't been able to work on the transmission as much as I have wanted too. The wife has decided the yard needs to be cleaned up for winter. So I have been working towards that end. I'll continue to post as I'm able too.

Today's project is setting the input shaft end-play. Since I have no idea what the correct selective thrustwasher should be, I'll start with a number "3" . After the input shaft is installed you install the output shaft with the selective washer installed . If you look closely in the bore of...

Those look like wheel weights that had the lead fall out.

I also installed the oil pressure regulator today. Installing the valve and spring. Installing the "reverse booster" valve. Installing the copper crush washer. Done.

Took some pictures of the "output shaft" bushing. This will show you how important this bushing is. Here's the busing in question. It fits into the output shaft. I'm showing how the bushing will fit on the input shaft. Here the bushing is installed and the "selective" thrustwasher is in place...

Yes that is the "wavy spring" I'm referring too. You do need this spring contrary to what this gentleman said. Without it the piston will "drag" on the reaction carrier, causing wear and heat and ultimately wearing out the friction material on the piston.

Hey Dave. Have you heard from "1944mb" lately ? I tried sending him a message but got no response. I know he used to visit your post before so I'll try and see if he reads it here. I have the servo for him, I just need to send it to him since I didn't make the trip to see you this summer. Also...

The other day I found something very interesting. I was cleaning up the "Output Shaft" when I noticed it was missing the "Input Shaft" to "Output Shaft" bushing. This is a small bushing (3/4" by 3/4" ) that acts like a "Pilot Bearing" on manual transmissions. It supports the end of the Input...

Spent a lot of time cleaning up another oil pan today. One item I need to mention is the oil pan "welch" plug, commonly called a "freeze plug" . This plug is on the side of the oil pan and is not mentioned in any repair manuals as normally you would never need to replace it. In a normal running...