I am trying to put together the parts for my manual conversion. I got a M20 (Main Case #3851325 and Tailshaft #3846429) but it didn't have a side cover, shift shafts, or shift forks.

For clarification my terminology is as follows (please correct me if it is wrong):
shift fork= large c shaped internal piece that slides over the sleeve on the main shaft
shift shaft=L shaped internal piece that the shift fork attaches to. Part of this protrudes through the side cover and can be either stud type or bolt type
shift lever= flat external piece that attaches to the shift shaft with either a bolt or nut. The shift rods attach to this piece.

Am I missing anything?

I know that the earlier Muncies had studs that came through the side cover to attach the shift linkage and the newer ones had bolts. Is there any difference in the early and late side covers?

My understanding is that a stud type shift shaft must be used with a stud type shift lever but those are the only parts that must match. Is that correct?

I guess my main question is what parts are different when dealing with the stud versus the bolt type side cover because I am trying to piece together used parts to put this tranny back together.

Richard

The correct sidecover would be a 707 with the stud type shifter shafts for your 325 case. PM sent.

Thank you for your reply. I got your PM and will keep your side cover in mind.

My original questions, however, still remain:
Does anybody know what parts are different between the stud type and bolt type side covers?

Richard

Hey ratchet, I do know the difference between the different styles depended on the year of the tranny, (bolt or nut). then you can tell diffrences of others. I'll have to look back in some of my old posts I asked this same type of question & got a great explained answer but I can't remember which style was early years & which were later years, I hope this is kinda what you were asking about:confused: I'll try to get back to this soon, later:thumbsup:

The stud type shaft that uses a nut, is shorter than the bolt style shafts. Unless it is a 306 sidecover from 1969. These 1969 bolt shifter shafts are the short style like the earlier stud type.

So, if you have a 1970-1974 648 sidecover but use the stud type shafts, there will be binding when you tighten the shifter arms. Also, I would not recommend the bolt style shafts in a 707 sidecover.

I hope this helps.

Jody, that did help, thank you. I will make sure that I keep the side cover and the bolt/stud shift shafts consistent.

Egore, I searched your old posts and found this post by Crash:
"The 1968 and older Muncie's use shift levers with slots .600" long....
1969 and newer the slots are .750" long and have 2 notches for the 3/8" bolt to pass thru...
So you can put 1969 and newer shift levers on 1968 and older Muncie's, but the lever can move up and down... Hurst does make a spacer washer to make this work...
You can't put a 1968 and older lever on a 1969 and newer Muncie... The slots not long enough and not wide enough for a 3/8" bolt to pass thru..."

I think this is probably what you are referring to. It also clears up the shift lever compatibility.

Richard

The reason why I got on this subject is because I was putting in a Hurst comp. shifter in my 68 but it has a 74 muncie in it. So the shifter kit was for a 68 hook up, (this wasnt going to happen). I called classic Industries & I was told to talk to this guy that knows all the loops,so this guy knew what I needed before I even had to explain. I needed diffrent linkage levers (plates) to convert to different nut/bolt style.Everything fell right together :beers:.

Keep in mind; yes, the slot dimensions between the stud and bolt style shift shafts are different; AND the shift shafts lengths are different between the stud and bolt style selectors. Except the shaft length of the 1969 bolt style
306 sidecover, they are the same length as the early stud style selectors.

I hope this helps.

I will keep that in mind, thanks Jody.

Before I started this post, I bought a side cover on Ebay. It just arrived this evening and has casting number 388468. I searched the site and googled it but couldn't find what application this side cover goes to. It looks just like a Muncie cover but none of the sites I found listed that casting number.

Any ideas about what year this cover is from and whether it uses the bolt or stud style shift shafts?

Richard

double check your last three cast numbers......it might be 648 instead of 468

I feel like a tool. I looked closer at the side cover and realized that the number on the end was covered up.

The real number is 3884685 which I found was put on 67-69 Muncies and accepts the stud type shift shafts.

Thanks for your help.

Richard

Just a reminder........there are two different stud type shifter shafts!

The 685 sidecover will have the upgraded 3/8"-24 stud threads and the 707 will have the 5/16"-18 stud threads.

Both type will work for the overall length of the 685 but, the 5/16"-18 stud style shafts were prone to twisting off.

Wow, you know everything about these transmissions!!!

Thanks for your help, I will try to find the upgraded shift shafts.

Team Camaro Rocks!!!!

Richard