trans case

[Chris H.]

I have a cracked trans case I picked up somewhere.

pn 3925660
P9P23 ?
19S703531

Can someone tell me what this is out of and if I should scrap?

[William C.]

Re: trans case

It is from a 1967 Corvette S/N 3531. It might be nice for the owner of the car to have, but otherwise depending on the crack location and severity it is likely more expensive to repair than to replace with a usable used item.

[Joe L.]

Re: trans case

It is from a 1967 Corvette S/N 3531. It might be nice for the owner of the car to have, but otherwise depending on the crack location and severity it is likely more expensive to repair than to replace with a usable used item.

Bill and Chris------


I agree that the stamped numbers would indicate it came from a 1967 Corvette. However, I have no information that the 3925660 case was used for 1967 model cars. I suppose it might be possible for a very late 1967 but this car would be a very early 1967.

[Philip C.]

Re: trans case

I have a cracked trans case I picked up somewhere.

pn 3925660
P9P23 ?
19S703531

Can someone tell me what this is out of and if I should scrap?

Chris I thnk you have a 68 built trans, 010 cases were used in 67, and 660 in 68. Iam reading vin 3531 from a 69 car not a 67. They may have used 660 very very late in 67, Iam saying that because Ive not been batting 1000 here lately, and the older I get, the better I used to be. I think the insides of the 660 will work in the 010, I dont remember if the pin size is bigger on the 660, I think they are the same, may be someone else will jump in here. If you have a 67 you need a 010 case. good luck Phil 8063

[Joe L.]

Re: trans case

Chris I thnk you have a 68 built trans, 010 cases were used in 67, and 660 in 68. Iam reading vin 3531 from a 69 car not a 67. They may have used 660 very very late in 67, Iam saying that because Ive not been batting 1000 here lately, and the older I get, the better I used to be. I think the insides of the 660 will work in the 010, I dont remember if the pin size is bigger on the 660, I think they are the same, may be someone else will jump in here. If you have a 67 you need a 010 case. good luck Phil 8063

Phil------


You're correct. This is a 1969 model year case from a 1969 Corvette. I don't know how I missed that.

Also, the '010' and '660' main cases both use the 1" countergear pin size. Functionally, the 2 cases are interchangeable.

[Chris H.]

Re: trans case

So do I put this in the recycling bin and put it out by the street?

[William C.]

Re: trans case

If broken, the aluminum recycler is the best bet.

[Paul J.]

Re: trans case

So do I put this in the recycling bin and put it out by the street?

Not yet. Find out what it's worth first. If it can be repaired and has some value, you can advertise it in Driveline or on Craig's list, or take it to the next auto flea market in your area. If it's not worth it, take it to your local metal recycler. Even as scrap, it will pay for your gas and a couple of beers.

If you don't want to fool with it, you can also do what another TDB member has done in the past, and give it away.

[Eric D.]

Re: trans case

Where is the case cracked??? I have repaired cases for myself and customers... Crash

[Chris H.]

Re: trans case

It is cracked from edge to edge.

[Tom P.]

Re: trans case

I have a cracked trans case I picked up somewhere.

pn 3925660
P9P23 ?
19S703531

Can someone tell me what this is out of and if I should scrap?

The date code, P9P23, translates to Passenger Muncie 1969 Sept 23 (yep, that first P stands for Passenger).
The year in a Muncie date code indicates the YEAR MODEL of the vehicle that it was installed in, NOT the year the tranny was assembled.

That case is pure scrap alum. That kind of a crack cannot be satisfactorily repaired. True, it CAN be welded---------and a person who is proficient at welding alum can do a very good job of welding it, but that case will never be true afterwards.
If you should plan to give it away, I would love to have it for the ears. I have repaired/replaced numerous ears on Muncie cases that were cracked/broken with ears from junk Muncie cased. Then ground down the weld and refinished it to where it is nearly undetectable.

[Dick W.]

Re: trans case

The date code, P9P23, translates to Passenger Muncie 1969 Sept 23 (yep, that first P stands for Passenger).
The year in a Muncie date code indicates the YEAR MODEL of the vehicle that it was installed in, NOT the year the tranny was assembled.

That case is pure scrap alum. That kind of a crack cannot be satisfactorily repaired. True, it CAN be welded---------and a person who is proficient at welding alum can do a very good job of welding it, but that case will never be true afterwards.
If you should plan to give it away, I would love to have it for the ears. I have repaired/replaced numerous ears on Muncie cases that were cracked/broken with ears from junk Muncie cased. Then ground down the weld and refinished it to where it is nearly undetectable.

Budweiser can material. Off to the recycling bin

[Joe L.]

Re: trans case

The date code, P9P23, translates to Passenger Muncie 1969 Sept 23 (yep, that first P stands for Passenger).
The year in a Muncie date code indicates the YEAR MODEL of the vehicle that it was installed in, NOT the year the tranny was assembled.

That case is pure scrap alum. That kind of a crack cannot be satisfactorily repaired. True, it CAN be welded---------and a person who is proficient at welding alum can do a very good job of welding it, but that case will never be true afterwards.
If you should plan to give it away, I would love to have it for the ears. I have repaired/replaced numerous ears on Muncie cases that were cracked/broken with ears from junk Muncie cased. Then ground down the weld and refinished it to where it is nearly undetectable.

Tom------


I think someone misinformed you. The first "P" in the transmission assembly code represents the transmission assembly plant and "P"= Muncie, Indiana, the "birthplace" of all 1963-74 Muncie 4 speed transmissions.

There is absolutely no difference between Muncies destined for passenger cars and Corvettes. In fact, in most cases, they even had the exact same GM part number for the assemblies.

[Tom P.]

Re: trans case

Tom------


I think someone misinformed you. The first "P" in the transmission assembly code represents the transmission assembly plant and "P"= Muncie, Indiana, the "birthplace" of all 1963-74 Muncie 4 speed transmissions.

There is absolutely no difference between Muncies destined for passenger cars and Corvettes. In fact, in most cases, they even had the exact same GM part number for the assemblies.

Joe,
In an early Chevrolet Parts and Accessory book I have on the shelf, on one of the front pages, it lists the codes for all the transmissions, such as the 3sp, PG, TG, 4sp, etc, etc. EACH tranny is given a code. The code given for the Muncie 4sp is P. The code for the truck 4sp is N.
P for Passenger Muncie (as it would appear) would include full size cars (Chev, Pont, Olds, Buick), ChevyII, Chevelle, AND CORVETTE (the Corvette is, IN FACT, a passenger car----------------as opposed to a truck). Thus, as I read the way the tranny codes are given in my Parts and Accessory book, the P that is given next to the word Muncie 4sp is the designator for for the alum case Muncie 4sp transmission for use in passenger cars-----------TO INCLUDE THE CORVETTE.
I'm too damn old and tired to let this get into a fight, especially with the NCRS group. I fought for years just trying to get the gear ratio disc for 3.36 and 3.55 ratios (for 62-earlier cars) changed, and finally, NCRS decided I was right (after 30yrs of banging my head against a brick wall on this issue), and it is NOW changed!!! The vendors WILL NOT change their illustration of the gear ratio discs in their catalogs until some OFFICIAL organization such as NCRS provides them with authorative documentation that they have the 3.36 and 3.55 discs reversed in their catalogs. So, I just finally gave up on that one. And I guess I'll give up on the P in Chevrolet's Parts and Accessory book beside the Muncie, Passenger being their code for the Muncie 4sp.

[Tom P.]

Re: trans case

It is correct that the P coded transmissions (such as the Muncie for pass cars) were built at the Muncie plant. Put the Muncie 4sp transmission for cars had a P code, whereas the Muncie 4sp transmission with an N code was a truck transmission.
The Borg-Warner 4sp got a W for Warner gear, which also designated the T-10 as well as the B-W 3sp. You see the W on the T-10 cases----------------which were only used in passenger cars, which includes Corvettes.