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A few months ago I started a thread on a th400 that goes to nuetral at WOT. I rebuilt another core, out of a 69 442. New Raybestos GPX frictions in the forward clutch, Sonnax clutch hub with bearing, new 34 element sprag, bushings, thrust washers, roller clutch, bands, etc. Took the car out for...

Are they worth anything on a time slip? Is there anything to be gained by using them? I have some .077 intermediate steels with the turbulator holes, I thought about using them in a 400 build. I have 2 of them, if I decide to use them I need 2 more. Problem is, I have no idea where they came...

I’m building a 4L80, this came out of a plow truck, and more snow is on the way. I ordered a TransGo shift kit, I got the small shift correction kit, without the spacer plate to dual feed. The guy is in a hurry to get it back, its his money maker. I have never done a dual feed on a 4L80, other...

Too much time bench racing!! Just out of curiosity, TH400 trans, if you machined every surface that has a thrust washer for a bearing, what if anything could you expect to see on a time slip? Ever done a back to back test on a dyno? I would think it would have to be worth something, as much as...

My hot water jet wash machine is in a garage that isn’t heated 24 hrs a day. Sometimes it might days it’s in the cold. I have always drained it for the winter, a friend asked if there was something that could be used to keep it from freezing. My first thought, RV antifreeze? For what I hope are...

I bought a trans at a swap meet that has a Fairbanks aluminum valve body in it. There are no part numbers, it had 2 bolts holding it in place, I’m guessing it wasn’t a running transmission and was thrown together to sell. Anybody in readerland know anything about it? Is it a decent part? Anybody...

I tore down a 400 trans to build for a friend of a friend that had a shift kit with modifications I haven’t seen before. The spacer plate is plated gold, stamped with the numbers 1400044-03. Other than the modulator to 1-2 accumulator hole being drilled to 3/16, all the other holes are present...

I went to Dick Millers Olds/Buick/Cadillac race in Norwalk zohio this morning. First pass was ok, next pass I staged the car, lightly torqued up the engine to about 1300( (just enough to take all the slack out of the driveline, just like I always do on the track) last yellow I swap feet. The car...

I have 2 th400 torn apart for friends, each with different problems. First trans is in a 71 Camaro, 6.0 LS with big turbo on E85. Car runs high 8s and is street driven regularly. Buddy said it was starting to kinda slide into 3RD gear. Trans has CK Performance forward transbrake valve body...

Why do the Teflon accumulator seals fit the case bore and piston well when first put on, but feel really sloppy loose after some run time? Is it a issue? I can’t help but wonder if there is room for improvement, Hydromatic did away with the Teflon rings and went to rubber seals on the 4L80.

what size nail is used to hold the manual valve shaft in the case on a 400? A 4d nail is too small, a 6d is too big. I’m not a carpenter, what is in between? Thanks

Greetings. I’m building a 4L80E for a buddies 66 Cutlass/455 engine. I have ordered a CK Perfomance accumulator body delete plate, my question is do I need to do anything to dual feed besides omit the center seal in the drum, omit the sealing ring on the center support and block the reverse feed...

For those of you who have swapped to a 400 trans, what did you do for the correct speedo gears? I am building a 400 for a friends Chevelle with 3.42 gears. The drive, driven, and speedo housing, clip and bolts were all missing from the core trans. Anybody in readerland who has done the swap know...

Assuming you have a 2004R in good condition, with CK servo, forward drum, shift kit and hardened input shaft whats the next weak link? And a good build with all the tricks? Just curious. Opinions?

What color spring do the TH400 experts prefer to use in the reverse servo(intermediate accumulator) in their street/strip 400 trans? I seem to recall reading somewhere that the yellow spring was used in factory high performance or heavy-duty applications. Secondly, when you remove the sprig (or...

I'm getting ready to freshen a TH400 for a friends 73 Camaro, it was a mid 11 second 406 street car. He is jumping on the LS1 bandwagon, going to a 6.0L with a turbo. The trans was build by me with a 34 element sprag, dual feed direct drum, roller bearing output, homemade manual valve body...

Once again, I come to dip my cup in the well of knowledge! What are the expert opinions on the load release springs on the 3-4 clutch in the 700-4l60/4l60E trans? The ATSG book says eliminated them, trans-go says leave them in, and I have used several of the Alto Powerpack 3-4 clutch kits that...

I was reading an older issue of Musclecar Review at work yesterday. There was a interview with a Buick Stage 1 engineer. He said he had Hydromatic build valve bodies for the Stage 1 cars with a calibration that would allow a automatic 3-1 downshift at speeds under 30mph. He said all other TH400...

Spent some time in the garage organizing some of my spare parts. How much effect does the 1-2 accumulator spring have on shift quality? I have lots of yellow, blue and orange. Also, whats the performance level capacities of the 71 and later roller clutch direct drums? Just looking for opinions...

Chris, hate to call you at work. Last time I talked to you sounded really busy so I figured Id write instead. Any word on the automatic shift transbrake for the 400 trans? Price? Availability? How are you doing on your 400 book? Thanks