Transmission rebuild help

[dgaskins21]

Hi guys I have just bought me a 68 C10 250 with a 3 speed and a nice 12 bolt rear end don't know the ratio yet. I am having trouble identifying my tranny I believe it is a saginaw it has a 4 bolt side cover and a 5 bolt tail house cover the only numbers I have found on it are 3830210 and 7 3844357. If I can ID this thing I would like to rebuild it. Once I do this I need an exploded view or some kind of manual. Any help would be greatly appreciated.
Thanks Dan

[69 longhorn]

If you have a 4 bolt side cover, its an old "2 pin muncie), non syncro 1st gear. The saginaw has a 7 bolt side cover. I have rebuilt many of either trans, & thaey arent that bad if you are a patient builder the 1st time or 2. best bet is a good old Chiltons on the breakdown. Best of fun,crazyAL

[dgaskins21]

Thanks it did come apart in 2 pieces I was wondering what was wrong every time I looked at a saginaw manual and it didn't match.
Thanks for the help

[Tx Firefighter]

Longhorn is right, if it has 4 bolt side cover it's a Muncie non synchro 1st.

I've had them apart before. The main issue with them is that they can rip the 3rd gear synchro hub out. It's held in by a snap ring that pops out of it's groove. On my current 63 truck, I just cleaned up the snap ring groove with a Dremel and put it back in place. It works fine.

They are dead simple inside and a great first transmission rebuild to learn on.



I just bought another one at the swap meet last week to rebuild and swap into my truck.



I got all of the parts to rebuild it (bearings and seals, etc..) at my local transmission shop for 70 dollars.

I will rebuild it in a week or so and take pictures of everything along the way and do a tech post on the process.

[dgaskins21]

Hey Tx do you happen to have some kind of manual or exploded view of this tranny. Your picture is the exact tranny I have. When I disassembled mine there were needle bearings all over the place. Do I need some kind of press to get the main shaft out of the tail shaft housing?

[Tx Firefighter]

I have one of those 30 dollar ebay service manual CDs for my 63 truck. It has a whole chapter on rebuilding the transmission. Good pics in there.

I don't know about taking the shaft out of the tailhousing yet. I just pulled it as a unit and slide the mainshaft/ tailhousing out so I could access the synchro part of it.

I have a big powdercoating job to finish this week, but should be able to do the rebuild and tech article next week if all goes as planned.

[dgaskins21]

Do you mind sharing some of that info on the tranny? I'll need it if I buy that rebuild kit from you.

[Tx Firefighter]

This is where I got my parts from. They are local to me but they happily do mail order.

http://www.standardtransmission.com/

Tell them you have an early 60s light duty 3 speed. I got all the rebuild parts from them for 70 dollars. They keep it in stock.

[dgaskins21]

Right on brother I'm working hard on this project. Thanks for the help.

[Wrenchbender Ret]

To remove the mainshaft from the rear housing there is a snap ring inside that you have to expand into a groove & tap the bearing out. The manual will explain it.

[dgaskins21]

How do I get the snap ring out? What manual? I don't have one, I'm looking for one though. Do you have one you can send me or a pdf version? Possibly know where I can get one?

[Wrenchbender Ret]

The snap ring stays in the groove. You expand it enough to allow the brg. to come out. I believe Classic Parts carries reproduction service manuals or you might find an old shop that has a Motor's or Chilton's manuals. I don't have a scanner hooked to my computer or I would copy one. I could print it & send it by USPO.