Th400 Id

[OLDCHEV4X4]

I have a th400 trans i just picked up and i need help with the numbers.
On the tag it reads: 345 74-CM 5883
This is what i think so far:
345=day of production = Dec. 12
74=1974
C= Chevrolet
M= ?
5883= the 5883 th400 made in that year.
Do i have this right??
What does the M denote? I'm thinking application.

Cast into the case near the motor is a 13.
It has a 4" extension housing.
It has a "original GM looking" shifter cable and brackets on it.
Thanks for any help.

[Thumpin455]

My listing doesnt have CM in 74, is this the tag on the side of the trans with one rivet holding it to the case? That is the one that tells what the trans has in it and came out of. I dont have a CM listed at all and the list is the entire run of TH400s.

[MylilBowTie]

Mine comes up as a 74-76 454 motor home chassis

[OLDCHEV4X4]

This is off the 1 rivet tag.

Hmmmm.....Motorhome. I like it. It probley has heavy duty strait cut gears.
Thanks mylilbowtie. Where did you get the info? Link?

[MylilBowTie]

Transmission rebuild book that has a decoding section in it. It doesn't say that is a th475 so it probably doesn't have the helical cut gears. Should have a deep transmission pan though.

Does it have a parking brake setup on the yoke? Any picture you could post?

[OLDCHEV4X4]

It has a slip yoke, and its not there. So no parking brake. Sorry no pic.

[K30_dump]

Originally Posted by MylilBowTie

...so it probably doesn't have the helical cut gears.

Hello,

I assume you mean it does have helical gears, right? In my records (and personal experience), the CM code does not indicate a TH475. I have a TH400 ('79 date code) with the CM code. The records I have indicate that it came out of a 30 series mobile home chassis (as the one in question), but not a heavy enough GVW to have the straight cut gears. I tore it down anyway, only to find it has helical planetaries. I have also never seen a 475 with a slip yoke. Anyway, let me know if there's anything I can do.

Good luck,

Joe Schaefer

[OLDCHEV4X4]

Welcome to the board k-30 dump.... Thanks for the additional info. Where in PA are you?

[K30_dump]

Hello,

Thanks for the welcome, glad to be here. I really enjoy helping people out when I can. I live near Williamsport.

Joe Schaefer

[OLDCHEV4X4]

Williamsport......... I want to WACC years ago. And i'm headed up there this weekend to do some Grouse huntin. Pleasant Stream road.

[MylilBowTie]

Originally Posted by K30_dump

Hello,

I assume you mean it does have helical gears, right? In my records (and personal experience), the CM code does not indicate a TH475. I have a TH400 ('79 date code) with the CM code. The records I have indicate that it came out of a 30 series mobile home chassis (as the one in question), but not a heavy enough GVW to have the straight cut gears. I tore it down anyway, only to find it has helical planetaries. I have also never seen a 475 with a slip yoke. Anyway, let me know if there's anything I can do.

Good luck,

Joe Schaefer

Yes you are correct. I ment to say does have helical gears. Looking at the CM listing again it states, 74-76 Series 30 mobile home chassis. So that is making me think more that its was a 1-ton truck with a slide in camper. It would need a CL or GT to be a Th475.

[Slonaker]

Originally Posted by K30_dump

Hello,

Thanks for the welcome, glad to be here. I really enjoy helping people out when I can. I live near Williamsport.

Joe Schaefer

My whole family is from Williamsport, but moved to Texas in the 1940s. Do you know any Slonakers?

Sorry to get so off topic...

Slonaker

[K30_dump]

Hello,

Sorry, but I don't know anyone by that name. Good to hear from you though, even if it is off topic

Originally Posted by OLDCHEV4X4

...I want to WACC years ago.

How long ago did you attend WACC? My Father has taught there (now Pennsylvania College of Technology) for the past 20 years. Just curious...

Joe Schaefer

[OLDCHEV4X4]

I went to WACC in 1985 and 86. Machine tool technology was my major.