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Before you start, drain the oil and disconnect the positive battery cable. Remove the distributor cap. Remove the dipstick and fan blade. Drain the antifreeze and disconnect the lower rad hose at the water pump. Remove the idler arm to frame bolts and lower the steering linkage. Remove the through bolts from the engine mounts. Raise the engine till you can place wood 2" x 4" pieces between the subframe and the upper side of the engine mounts using the 4" side. You may have to remove the starter. Rotate the engine to get the timing mark at 6 o'clock. You may want to loosen the transmission mount but I would not remove the bolts as the will help to keep the engine from moving forward or back. Do not use sealer between main bearing cap and engine bock. If you use sealer between ends of the rear main seal I would use something like Locktite gasket maker.

Just a couple of questions.  Why put ends of rear main seal at 2 and 7 [8] O'clock?  What happens when you later remove the main bearing cap for inspection?

   If you use diluted muriatic [hydrochloric] acid to test for zinc plating you should be aware that both zinc and iron oxide [rust] will produce foaming. There may be a difference in color of the foam.

Having seen many U joint to pinion yoke straps and U bolts for 60's and 70's GM cars and trucks. I do not recall seeing any that were not "raw' or "natural" steel.

The Saginaw 3 speed backup light switch is the same as Saginaw and Muncie 4 speeds for 67 and 68. The bracket that mounts the switch to the side cover is different than the  Muncie 4 speed. The 1/8" rod that hooks the switch to the 1st and reverse lever is unique to the 3 speed Saginaw floor shift. I hope this info helps, I am working from memory.

What year is the car?  What year is the Muncie 4 Speed?

Remember that main case casting number 3890564 was use in 3 speeds, cars and trucks. That should make it easier to find one with the correct date code. The side cover is 4 speed only. I believe the extension housing is also the same for 3 an4 speeds. You would have to piece a transmission together. That can be done if you want the correct date codes.

Of some interest. In my observation, over the years, the part number is often one or two numbers higher than the casting number. In this case, casting number is 3890564, part number is 3890566

The numbers I supplied are part numbers as of February 1970 and are different from casting numbers. I am trying to point out that in 1967 production there are at least two different castings used for the main case. I am not sure when, as the parts catalogue calls "AFTER JOBS" were installed on the production line. Looking inside the transmission The "FIRST JOBS" reverse idler is 1 1/2" long and the "AFTER JOBS" reverse idler is 2 1/8" long. The reverse main shaft gear "FIRST JOBS" gear teeth are partial width of sliding sleeve, "AFTER JOBS" the gear teeth are full width of the sliding sleeve.

I have just checked my Feb. 1970 Camaro parts catalogue. The Saginaw transmission case part number for 1967 3 and 4 speeds "FIRST JOBS" is 3890566. The 4 speed "AFTER JOBS" case part number is 3925654. I do not have the original casting numbers or the date of the design change. The improved reverse idler gear made it necessary to change the case, reverse shift lever, 1st -2nd synchronizer assembly with reverse sliding gear and reverse idler shaft. There were other changes to improve the transmission. The side cover changes in 1970. Saginaw 4 speeds were used in Vega to trucks so there are many variations out there. More research may be necessary but I hope this helps.

I believe the 1967 Saginaw 4 speed was redesigned during the 1967 production. The case, cluster gear and all the parts involved with reverse are different and not interchangeable. I am not sure when during the year the change occurred. This info is from my memory.

The cable is definitely grey. I know the cars history back to the early 1980's. The cable has the correct firewall  grommet. I am asking if any 67 Camaro came with a grey speedo cable. Is it possible GM supplied a replacement cable in gray.

I am looking for help on the speedo cable for my 67 RS coupe. The car came with a grey speedo cable which is damaged.  Many years ago I purchased a replacement cable from Ricks Camaros and it is black.  The grey cable has a burn mark but is still serviceable. I am hoping for some good advice on which cable to use. The car has the original Muncie 4 speed.

I believe post #10 is correct. I just read the 1967 chassis shop manual and it says [valve in open position] and I believe that should read [valve in closed position].  The plunger comes out as the valve opens. The manual is almost always correct but I think this time it may be wrong.  Remember the manual is referring to bleeding with a pressure bleeder that is maintaining 40PSI on the system and that may push the plunger out. It may be necessary to hold the plunger in bleed the rear brakes first.

that valve holds off pressure to the front brakes on disc brake cars so that the rear brakes can apply lightly before the front calipers apply. The rear drum brakes have a residual check valve in the master cylinder that holds something under 10 PSI on the rear system at all times. When bleeding the rear brakes that valve may need to be held or kept in its seated position to get fluid to the rear wheels. Bleeding is always done at the wheel furthest from the master cylinder first.[ rear]  Once you get some pressure at the pedal you usually do not need to need to hold the valve. Holding the valve helps get fluid to the rear brakes first. I hope my explanation is OK and correct.