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How do the hydraulic throw out bearings differ between Mopar, Chevy, Ford? Are they application specific or modular meaning that only the piston (diameter) is different and swapping the piston allows you to turn a Chevy TOB into a Mopar TOB?

Here's what I did: A833 assembly tricks

Do you have a Borg&Beck clutch with no over-center spring? Or a diaphragm clutch (which doesn't need an over-center spring regardless of having a hydraulic TOB or not).

I get it ;) Although I have a lift this isn't something I want to do several times. Would it help to leak test the transmission on the bench? Fill it with warm/hot oil and see if it leaks from the shaft? Or does it work to remove the reverse shaft if you turn the tail housing around (like you do...

didn't replace the O-ring but according to previous owner it didn't leak.. I know I'm taking my chances here

How do you convert the shift shafts to 3/8 threads?

I actually remembered your technique before I started but the cluster pin didn't clear and since I had everything painted I went ahead and did it the "book" (= Passon A833 book) way. good tips! on note 4: I used Vaseline and it is actually quite sticky! I did use a mock pin (which came out...

Here are two assembly tricks for a 4-speed transmission I came up with (haven't seen these before): The most cumbersome job (at least for me) when assembling an A833 is to mate the main shaft assembly with the main case. The loaded main shaft (I know I know ;) ) is quite heavy and since you...

Made my own key out of 1/2" bar stock - took me 5 minutes ;)

I wonder where this key comes from.. reverse shaft (didn't take out mine)? It was in the same bag I had all small parts stored. What puzzles me is that Brewers shows the same keys for cluster pin and reverse shaft: Brewer's Performance - Mopar A833 4-Speed Transmission and Component Specialists

What's the deal with the woodruff key for the cluster pin? The counter shaft pin is supposed to be secured with a woodruff key but the key I took out of the tranny is much wider than the slot in the new pin? Interestingly the slot in the old pin is the same width.. Do I have the wrong key or...

Thanks for all the measurements and thank you @johndee aa well! I'll do another close up inspection on the groove, should, hub, snap ring - f I can't find anything I'll remove 0.15mm from the hub and call it a day!

Thanks for getting the info! Soo, should it be 2.638" (67mm) or 2.61" (66.3mm)?

Could you measure one hub for me? I might have another one but need to find it first... The hub + 3rd gear stacked together on the bench has a height of 66.70mm (2.626") - see pic. Distance between shoulder on mainshaft and snap ring groove is 66.10mm (2.603"). Snap ring groove is 2.70mm wide...

took the synchro assembly apart. Hub is on the left (right hub is from another 3-4 assembly for comparison) and it measures almost the same as the other one (difference in hub thickness is only 0.002"). What is interesting is that first and second gear have much more clearance (I can move the...

Thanks AJ! Hubs are 3-4 ones - no doubt as they are quite different than the 1-2 hubs. The depth (just the splined part that sits on the mainshaft) is exactly 20.00mm = 0.7874" I only need a few thousands clearance so I don't think it matters where I take it off. oh, the 3-4 synchro assembly is...

Compared it to another mainshaft and dimensions are the same. Tried another 3rd gear from a 2.66 set (mine is a 3.09 set) and I get the same overhang - on both shafts! So I think this might be correct. The synchro assembly is a late style torq lock synchro. Definitely A833 and hub/drum length is...

Ok, so it's ok that the rollers can move back an forth? Do you mean a picture of the hub? Or the slider? Here is a closer picture of third gear and one of the synchro assembly from the other side. Will take more pictures tomorrow.

I'm assembling the mainshaft and realized that I can spin first and second gear but not third gear. Turns out that the synchronizer hub (3-4 synchro) rubs against the front of the third gear cone once I put the snap ring in place and prevents the gear from turning freely. How much clearance...

Thanks! Main shaft was my main concern but I measured it against a known good shaft (I know that sounds wrong but you know what I mean ;) ) and diameter is the same. Ok, new countershaft it is. Cluster gear is fine as I use a different gear set with very low miles.

Are these parts still useable? Countershaft shows some flaking of an otherwise perfect shaft. I know these are available new but cost $60 in Europe. Is welding and grinding down an option (are the shafts hardened? I assume yes...). Mainshaft: this is the bearing seat area (rear bearing)...

@AJ/FormS Didn't you suggest in other threads to PUT a screw on the cones for better shfting performance? I remember that you said you bias 2-4 for upshift and 1st for downshift. So, put a screw on the cones or not?

The higher the gear the faster the M/S will be spinning. Think about it this way: engine is turning 6000 rpm - will the car be faster in 4th or 1st? The M/S rpm is directly related to speed of the car (M/S rpm divided by rear end ratio = tire rpm. Tire rpm times tire circumference (in miles)...

Thanks, that's what I needed to know. Drum can be seen in the background - it won't work with any other than the torq loc slider. Why were the drums cut like this (omitting some splines)?

I have a torque lock style synchronizer assembly which I think was only available on later OD transmissions. They use a special hub but the keys are the same as for the other 1970 and later synchros (3/8" wide) - at least that's what I thought. The cutout in the slider sleeve is very shallow and...

Already deglazed the cones and put a "screw" on them (found the idea in another of your posts). When upshifting the mainshaft spins at a lower speed than the next gear. e.g 2-3 shift: mainshaft spins 2nd gear speed and 3rd gear spins faster. When the synchro collar pushes the brass ring onto the...

I have some pretty worn gears and synchro sliders and I tried grinding the dog teeth so that they are somewhat pointy again (vs. rounded as before). Turned out ok but could this be a problem in the sense of that the dog teeth are too far back now? Didn't grind of a lot but removed some material...

I'm in the process to convert my car from auto to 4-speed and one of the necessary tasks is to set up the clutch linkage. I think the following lines might help others who are in the same position. 1.) There are several different ways how you can actuate a clutch: a) mechanical linkage b)...

Car will be converted from auto to manual so I was free to choose what type of clutch actuation method I want to have. Basically it doesn't really matter if its a mechanical (linkage, cable) or hydraulic type - they all do the same: convert the pedal movement to clutch departure. If the tip of...

ok, good to know. Is a 2600 lbs static pressure plate - non adjustable for now so I'll leave the OC spring in then. I don't know the mechanical leverage of the hydraulic TOB. The master cylinder (wilwood) has a maximum stroke of 1.12" (3/4" bore) - no idea how far this will push out the TOB.