67' Muncie 4 speed with cast #3851325

[Dave K.]

I believe cast # 3851325 is a Muncie 4 speed for 1964 and early 1965....however, I have a 1967 427 convertible with this muncie 4 speed. Is this possible or do I not have the original Muncie in my car.

Dave

[John D.]

Re: 67' Muncie 4 speed with cast #3851325

dave

Is there a VIN or assembly date stamped on the side of the case ?

[Dave K.]

Re: 67' Muncie 4 speed with cast #3851325

Yes! Right below the #3851325 (on the right side) it says US Patent No. 3088336 GM corp...then to the left of that (at the rear of the tranny) it says PO819. Also at the top of the tranny it says K108366. Left side of tranny on the side cover it says 3884685.

[William C.]

Re: 67' Muncie 4 speed with cast #3851325

Simple, you have a 64-65 Trans in a '67 car...out of a car built at the Leeds, plant (Ks City) Probably an "A" body Chevelle, Olds Cutlass or Pontiac Tempest

[David L.]

Re: 67' Muncie 4 speed with cast #3851325

Dave,

The "3851325" casting number on the main case is 1964-1964 vintage. The "P0819" stamping is Muncie, August 19th. The "K108366" is a partial VIN where K = Kansas City. Chevelles were made in Kansas City but not Corvettes. The "3884685" side cover is 1966-1967 vintage.

The 1967 and newer Muncies have a different stamped date code format.
Example: "P7E03" = Muncie, 1967, May, 3rd day of month
A = Jan., B = Feb., C = Mar., D = Apr., E = May, H = Jun., K = Jul., M = Aug., P = Sept., R = Oct., S = Nov., T = Dec.

Is the tailshaft casting number "3846429" (until 2/65) or "3857584" (after 2/65)?

Years ago I had a 1967 Corvette Muncie case with a "3885010" casting number and stamped date code "P7B137" (Muncie, 1967, Feb. 13th, with only the top half of the last number "7" which I no clue of its meaning except possibly a mistake). The partial VIN was "7S113122" where "S" = St. Louis. I bought the case at a swap meet in Taunton, MA, in June 1989.

Dave

[Dave K.]

Re: 67' Muncie 4 speed with cast #3851325

The tailshaft is 3857584. So this means i do not have the original tranny? The tailshaft however could be original??

Dave

[David L.]

Re: 67' Muncie 4 speed with cast #3851325

The tailshaft is 3857584. So this means i do not have the original tranny? The tailshaft however could be original??

Dave

Dave,

According to "1965-69 Chevrolet by the Numbers" the 3857584 tailshaft was used on 1965 models made after Feb. 1965. The production usually ends in August. The August 19th main case seems really late for a 1965 model but who knows. The side cover is 1966-1967 vintage.
Obviously there were some changes made.

Dave

[Dave K.]

Re: 67' Muncie 4 speed with cast #3851325

Thx everyone! I knew something didn't add up when I referenced the Corvette ID Numbers catalog. I'm slightly disappointed because I thought I had a 67' vette with the original motor and tranny. On the inner door of the glove box are some stickers that have 1st and 2nd place finishes at a drag strip in Michigan from the early 70's......this probably explains what happened to the original tranny.

[Mike E.]

Re: 67' Muncie 4 speed with cast #3851325

I've seen two types of bosses on the top of a 3851325 cases. I've wondered when this changed?






Mike

[William C.]

Re: 67' Muncie 4 speed with cast #3851325

Some pictures from a '66-67 style muncie case and tail attached. Note speedo outlet on the pass side and "010" casting on the main case.

[Wayne M.]

Re: 67' Muncie 4 speed with cast #3851325

Simple, you have a 64-65 Trans in a '67 car...out of a car built at the Leeds, plant (Ks City) Probably an "A" body Chevelle, Olds Cutlass or Pontiac Tempest

He has a very early '65 Muncie trans P0819 (assembled Aug 19th 1964) and (as you say) probably into a Chevelle produced about mid-Sept '64 (end of month Kansas City Chevelle VIN for Aug is 102623; and for Sept is 112784).

[Wayne M.]

Re: 67' Muncie 4 speed with cast #3851325

Mike -- your top photo has the rounded nose for the bolt boss, and was on '64 and '65 ...325 cases up to (about) early December 1964, after which it went to the square shape (stronger ?).

But your bottom photo is of a SERVICE ...325 case, cast in the ...660/661 case design era. Notice the wide stamp pad. Looks like there's an over-the-counter Muncie production 5-digit number stamped there. Reason why they continued to provide service ....325 cases is to accomodate the original ...325 7/8" dia. counter shaft and other minor internal features which couldn't transfer to a 660/661.

I've seen two types of bosses on the top of a 3851325 cases. I've wondered when this changed?






Mike

[Mike E.]

Re: 67' Muncie 4 speed with cast #3851325

Mike -- your top photo has the rounded nose for the bolt boss, and was on '64 and '65 ...325 cases up to (about) early December 1964, after which it went to the square shape (stronger ?).

But your bottom photo is of a SERVICE ...325 case, cast in the ...660/661 case design era. Notice the wide stamp pad. Looks like there's an over-the-counter Muncie production 5-digit number stamped there. Reason why they continued to provide service ....325 cases is to accomodate the original ...325 7/8" dia. counter shaft and other minor internal features which couldn't transfer to a 660/661.

Wayne,
Thanks for clearing that up. Both of those cases are on Ebay right now. I just grabbed the images to ask the question.

Mike

[Tom D.]

Re: 67' Muncie 4 speed with cast #3851325

I wonder which Michigan drag-strip...

[Tom P.]

Re: 67' Muncie 4 speed with cast #3851325

The tailshaft is 3857584. So this means i do not have the original tranny? The tailshaft however could be original??

Dave

There is no casting numbers on a tail shaft----------------------BUT, there MAY be a casting number on the tail housing.