No it is not a just a riv thing.....the earlier 400 used the same spline but the od of the slip yoke was smaller.........normally I've only seen that on pre 68 400s
My caliper might be off a hair but 1.7" is the o.d. This is the original driveshaft from my 70 Riv. I have the driveshafts from the other two transmissions and they are the same as well.
I forgot to mention the best news of all. I finally put my order in for my JW 9.5 converter. Great guy to converse with! I had the $ set aside to do a converter and almost completely forgot to order it as I'm hoping to have my trans done by the end of this week and installed next week. These are my hopes but they never seem to fall in line the way I plan them.
I had a 68 Pontiac TH400 with the smaller outer dia yoke. It is possible to just change the rear case to the other (1.89) size, the shaft is the same. Bruce Roe
If I swap the rear tail housing to the larger one to accommodate the larger seal and bushing in my kit then I would have to change the forward driveshaft yoke to the larger size as well. This is correct right, or am I missing something? I don't want to mess with the driveshaft if it's not completely necessary.
Monday update. So by the end of the day I should have the correct seal and bushing for the extension housing. Got my pump stator to forward drum selectable washers last week and got my front end play dialed in to .015" with the .073" selectable. Installed a Sonnax o-ringed boost valve kit in the pump assembly as well. Now it's on to the valve body area and Transgo shift kit install. On a side note, does anyone have a suggestion on a trans cooler brand or style and a -6 braided line kit? Also any suggestions on an aluminum pan preferably standard depth? Thanks!
Read through my thread on coolers, http://v8buick.com/index.php?threads/transmission-cooler-recommendation.299758/ There are lots of cast aluminum pans for the THM400, or steel pans. This one is cheap, https://www.jegs.com/i/JEGS+Perform...MIxNjN7sHK6gIVF6SzCh1ZOQLhEAQYAyABEgJLT_D_BwE https://www.summitracing.com/search...ission-pan-style/deep/transmission-type/th400
Great thread! Good info on the cooler and parts involved. Some of the links seem to be dead, but it shouldn't be too difficult to figure out. I wasn't following the whole torque converter spacing thing in relation to the flexplate. Any chance you can touch on this a little, maybe I just wasn't reading it right? Thanks Larry!
The important links are the conversion fitting sizes, at the transmission, and the radiator. If you are using -6AN hose as I did, then these are the transmission fittings, https://www.jegs.com/i/JEGS+Perform...MI4q6gtK3L6gIVj5OzCh3xVwbrEAQYAiABEgL3BfD_BwE And at the radiator, https://www.summitracing.com/parts/...MI6vzhka7L6gIVionICh2wig8eEAQYASABEgLVAfD_BwE Then whatever type of hose (braided, teflon lined, push lok) you want to use with the applicable fittings. As far as the flex plate converter clearance, I don't think you need to worry about that unless you are using a new converter and a non stock flex plate. JW was saying that the flex plate flexes forward under power and there have been cases where the flex plate to crank bolts contacted the converter cover. He posted this youtube video of how much the converter moves, He also posted this picture of a converter that had witness marks where the contact was, Obviously, this is No Bueno. I used ARP thin headed bolts to bolt the flex plate to the crank. I had plenty of clearance even with the non stock flex plate (flat, no offset) I was using.
What about the hose for the trans lines, any recommendations? Buy already made and painfully route them and hopefully make them fit well or build your own to fit?
Build your own to fit. You basically have 3 choices, stainless steel braided line, teflon lined braided, and push lok hose. All use AN style fittings. Assembling the line has it's challenges. Braided line can be a pain if you don't make a CLEAN cut. The steel braid can fray and make it very difficult to get it through the fitting collar. There will be blood. The teflon lined stuff looks interesting. I have never used it, but the fittings use "olives" or "ferrules" like compression fittings. The videos make it look easier than traditional braided fittings. Then there is push lok fittings. You have to muscle them on. Heating the hose helps. Once they are on, you are good. If I was doing it today, I would be tempted to try the teflon lined stuff.
Monday update, so I ordered one of those standard depth polished aluminum pans to finish off this build. Not so much for the bling but for the aluminum aspect and the nice stout flange that it has. Well I got the pan and it's a decent piece with a drain plug and included hardware. Now here is my question, the original pan depth measures 1.75" from the inside of the pan to the gasket side of the mounting surface. This new pan measures 2.25" measured the same way. None of these measurements include the gasket. The filter as assembled and mounted to the trans and measured for it's installed depth is around 1.75" which means that with the stock pan and gasket installed there isn't a whole lot of filter movement that can happen. Am I thinking this out correctly that with the new aluminum pan and gasket installed and the extra .5" of space that the filter pickup tube can possibly come dislodged?
I measure just over 1.5 inch on the 65-67 heel print pan, 1.75 inch on the later except the super duty model (trucks?). I would not want the pan that low without pickup mods to match. Generally I do not favor the aluminum pans on a car. First they hang a lot lower. Then if they do take a serious hit and crack, it will be tough for most of us to fix the leak. A metal will usually just dent, worse case can be brazed. A drain plug mount is brazed into mine. good luck, Bruce Roe
I have the GM Deep pan on mine. It required the extended pick up and longer shouldered bolt. I'm not sure if all the components are even available anymore. Here are the GM part numbers, THM400 Deep Pan, 8679994 Extended P/U Pipe, 8629526 Extended Filter bolt, 8633208 Spacer for Filter bolt, 8629523