Race TH400: Front Pump

Pump Mods and final assembly!

[@hairyparatestes1183]

Idea- locate a block of wood, drill a hole with a boring bit large enough to slide the pump stator into hole and put the wood block in vise then stator into block. That way you can crank on wood block instead of using a dang sock to protect the stator shaft.

[@MrLangleylad]

Well Shawn , you made me do it . My trans is all in pieces . Happy to say all looks good . Thanks for doing this series , by far the best info on 400's on the net. One "pro builder" was surprised to find a nail was used on the assembly of his trans. Somebody that didn't know what they were doing was into this trans he said , lol . Thanks again , your loyal follower ... lol

[@keithcline6954]

Great video! I livf watched one of your other vids and you were talking about military choppers and planes flying over. I live near a navel air station so I get them all the time. Never grow tired of the thrill and rush from hearing, seeing, and feeling the sheer power of those aircraft. Thanks again for the exelent video. Take care

[@timdontwannasay5889]

Every video is something new! Awesome and informative!

[@kwsmith2431]

Having a hole in your bench for starter works well to work on pump and forward clutch drum

[@cfmechanic]

I truly appreciate all the time and effort u put into your videos great work

[@jordansmith8467]

Always great and informative content good sir. Keep em up!!!

[@wizzkidelectronics]

Good stuff I usually drille a .060 hole to add some fluid to the lube circuit for the planetary. Wish we could share pictures on here . Was something I found in one of the performance transmission books I bought in the 90s seems to help extend the life of the washers

[@mountainsgarage]

[e-mail] if you want to share info. I love seeing other’s perspectives! Thank you!

[@johnnybrigham8154]

Thanks for the great work your friend always jb.

[@robertbanks6870]

Nice work

[@snickerdoodleduke]

Awesome video! I'm curious though, I've been a fan of the Sonnax boost valve for a while (400-LB1), I've been using them in 4l60s since Sonnax released them. Do you think its a good idea to restrict the converter charge port when using their valve? It does come with a spring that they advertise as being 10% stiffer than stock.

[@dtperformance256]

Great video! I am getting ready to replace the front pump bushing and this is an excellent video. One question: do you have the torque specs for the rear pump bolts ( the different lenght bolts) and the front pump bolts? I know I can look this stuff up online but sometimes you get different numbers and info so I wanted to ask a guy that has obviously built 1,000’s of these transmissions. Thanks Shawn!

[@young11984]

Appreciate the detailed info, what kind of shifter cable bracket is that on the lever? I need to get a few of those for spares and cant seem to locate that style anymore

[@tcbheadersmanifould8757]

Hey man graet inform.. do you tap al or just for trans braek ?

[@mattlyons6134]

I heat the set screw with a propane torch until it's cherry red. Let it cool and it's easy to drill.

[@mountainsgarage]

Good tip! I bought a 100 brass ones.

[@toddrhine7648]

Luv your videos and a thumbs up! Hope you can answer my problem here. I have a TH 400 in my Chevy pick-up. Not a race truck either! When I shut the motor off and when sitting for a bit, it pushes out Trans fluid. Can't find wherever it's coming from! Any ideas why or where? Thx much bud.

[@mountainsgarage]

Thanks! Start simple, check the vent tube, and all the seals above the pan, speedo, dipstick, linkage, kick down, front pump.

[@hdm299]

Will the grub screw help with a foward manual valve body and maybe do a vid on making a manual valve body from a factory one with all steps needed for it and for trans build?

[@mountainsgarage]

Yes any time pressure is increased it helps.

[@mean70632]

Shawn, I took apart the Billet aluminum TH400 pump I have from Coan, and discovered that it does NOT have that hole in it like the one in this video that you've threaded and installed a set screw in. It only has the hole which is further away from the shaft and located right above the pressure regulator bore, and while there isn't any plug nor set screw in that hole, for some reason it IS threaded and it came that way directly from the manufacture, (which is Coan). So my question for you is: Since I'll be using a trans brake valve body in this TH400 I have, should I go ahead and install a set screw with a .110" drilled hole into that orifice which is located directly above the regulator valve bore since this pump doesn't have another hole right next to it like the OE pump does? Or is that hole on this Billet pump threaded ONLY for using a dump valve? And if it IS only for a dump valve, (which I will not be using) will I be ok using this pump with a trans brake just the way it is?

[@mean70632]

Is this engine thrust modification on the pump shown in this video usually needed with most aftermarket aluminum billet pumps too, or do they usually already have the .110" restriction hole built into them?

[@mountainsgarage]

I don’t know if they come restricted or have the ability to modify them. I haven’t had one to inspect. Hard to beat the stock pump in almost every application.

[@mean70632]

@@mountainsgarage Thank you for your quick reply. I bought an aluminum billet pump from Coan because it has an adjustable set screw which will allow me to adjust the line pressure any way I want just by dropping the pan. I guess I'll just have to remove the five bolts and take the pump apart to check to see how big that orifice is.

[@mean70632]

of course I could've probably just bought an adjustable reg for stock pump I guess, but this is a fresh build, so I needed to buy a pump anyway.

[@noahthompson1811]

Would you recommend that set screw charge port mod to a any th400 with a trans brake or just turbo cars that sit on the brake for a while?

[@mountainsgarage]

We never used to and with a traditional SBC or BBC things were fine. But it doesn’t seem to hurt anything to go ahead and do it.

[@funfun8095]

👍

[@charlessaunders7480]

is there a yoke to use on an rv turbo trans. without having to mill the output shaft you talk off?

[@heilracing]

Do you have the part number for the seals on the pump think the new ones are orange?

[@coleschott007]

You Drilled The Set Screw?!?!? man o man how many bits did you go threw and how long did it take?

[@mountainsgarage]

I drilled my first and last one! Brass ones back in stock!

[@chrisprice4420]

I notice you didn't check for pump body wear, a step created by the pump gears I also noticed that 1: you did not check the thrust area on the body. When the bluing is warn off, the pump body is finished. 2: you didn't mention the wear on the gear teeth, also the wear pattern marks left by depth of the torque converter. I wouldn't reuse the gears. Do you clean everything (internals) in parts cleaner Spirits? What about the transmission body, that needs to be run a washer with some pretty harsh chemicals to get rid of road grime and metal debris. I never paint until it's all assembled. TH 400s are almost extinct 😂

[@mountainsgarage]

I have over 100 TH400 videos, we eventually will cover everything! Do you have a transmission shop?

[@georgeneil1148]

I have a turbo 400 that has set in garage for a couple of years. The trans has not been disassembled. Before installing in car i tried to turn pump by hand. It will not move. Should you be able to rotate pump by hand.

[@mountainsgarage]

How are you attempting to turn it?

[@georgeneil1148]

I am using both hands to grip oil pumps large spline and trying to turn

[@mikewolfe789]

Great videos what do you think about me using yellow Transgo spring for the pump? Bs stock in a dual feed mod will it screw up the pump wear wise?

[@mountainsgarage]

Thanks! The pump won’t wear out due to a increase in pressure, it is still regulated and operating in it’s normal range. Internet folklore for sure!

[@mikewolfe789]

Thanks for the quick response! Also do you know what a good tolerance should be with the intermediate 3 clutches ?

[@mountainsgarage]

@@mikewolfe789 Shoot for .040 to .050

[@mikewolfe789]

The stock setup had a 3 clutches and 3 steels one being a waved plate and had 100 thousands how do you set yours up for a daily street driver?

[@mountainsgarage]

@@mikewolfe789 Three clutches, three steels, no wave. Either cut the aluminum piston or the pressure plate to set clearance. If I was using what I had without options to change clearance or it’s a mild transmission leave the wave and 3+3 should have the correct clearance with new stock thickness parts.

[@robertbanks6870]

Hi this we're my papa tricks out make pump pumps more fluid and shifting real harder I like to know tricks

[@krazobuildz7567]

So is this pump mod for a trans brake pump or just any 400 race transmission in general

[@mountainsgarage]

When you shim or install a stiffer pressure regulator spring for higher pressure this is one way to control the pressure in the converter feed. So any valve body.

[@krazobuildz7567]

@@mountainsgarage alright thanks

[@teamabaddonracing6870]

Do you have a part number for The snap ring that holds everything in place. Or where can it be bought. I been searching the net with no luck.

[@mountainsgarage]

Which one? The HD intermediate?

[@teamabaddonracing6870]

@@mountainsgarage the one that holds the pressure regulator spring and valve in the pump housing

[@mountainsgarage]

@@teamabaddonracing6870 11503348 is the number I believe.

[@teamabaddonracing6870]

@@mountainsgarage thank you very much for the videos and all the help you give to us.

[@TimothyGambino9085]

What about the 2 bronze bushings ? That’s what you should be showing

[@mountainsgarage]

I just did a video on stator bushings.

[@TimothyGambino9085]

@@mountainsgarage ok cool . I can’t see the video right now. Do they press all the way down to that tiny shoulder to square them up Or should there be a slight gap and not hit the shoulder? Like mine had.

[@grannysgarage8101]

How do you replace the pump stator tube? Thanks

[@mountainsgarage]

I have the press tool from TSR Transmission that I use to replace Powerglide stator tubes. Press out and press in then I pin it with a set screw. I have never done a TH400, the stock hardened tube is fine. Now I need to try this on a junk pump to see if the same tool works or make a new one. Thanks for the idea, sorry I couldn’t directly answer the question.

[@grannysgarage8101]

@@mountainsgarage no worries i always appreciate the input. My torque converter chewed mine up but at this point I may just replace the pump assembly. Can of worms like always

[@vrg69]

My transgo kit said to leave out the horse shoe is that correct

[@mountainsgarage]

Most higher pressure springs say leave the horseshoe out, yes.

[@vrg69]

@@mountainsgarage thank you again got all my mods done and fixing to put it all back together

[@kwsmith2431]

That was stator

[@inscoredbz]

That's exactly what I use for a pump alignment tool. I'm not a big fan of using a case.

[@ronniecox109]

Two valves from a small block chevy. Drop the stems thru bolt holes 180 degrees apart. Perfect everytime.

[@inscoredbz]

@@ronniecox109 I'm gonna have to give that a try. Thanks

[@ronniecox109]

The case method can backfire , even without the pump oring. I have cocked em . Causing an uh oh moment. Tye valve trick works on 350s and 400s. Built 2 4L80s yesterday, and 1 4L80, and a RW70 ford today. 1 350 left to build tomorrow. Saved the easy one for last. Then I'm going to Summit , or the gun store.

[@terrywilson581]

😅😅😅😅😅😅😅😅😅😅😅😅😅