What tranny is this - GM 8672305 ?

[Tx50chev]

Purchased tranny without a shifter, do not know which tranny I have? The tranny is all aluminum, and has GM 8672305 in two places on the case, it came from a 1989 GMC 1/2 ton. Can you help me?
Thx,
Eddie

[ChevLoRay]

Uhhh, have you "googled" it? Just enter the number in quotation marks with the description.

[special-K]

Thanks for the help. I just came to this thread by a Google search where I entered these numbers. Big wheels keep on turnin'...

can someone help positively identify this 5spd? I know there were basically 4 different transmissions all under this same number. The seller doesn't know what year truck it's from. Basically, if it's a NV3500 I want it, if not I don't. Price is right at $350, IMO. He decided to go automatic and I'm thinking to sell my '65 Pontiac M22 w/ new clutch for mo' bucks and a better travelin' truck

[special-K]

Ok, I waited too long to get back and ad pictures. Not sure what the point is for putting a time limit on adding pictures is, but here they are in their very own special post:

[95 S_Trucker]

Its a 5LM60, It looks like the NV3500 on the outside, but the internals are different.

The NV3500 didn't come out until 93.

[ChevyTech]

Originally Posted by 95 S_Trucker

Its a 5LM60, It looks like the NV3500 on the outside, but the internals are different.

The NV3500 didn't come out until 93.

I agree!

http://www.chevytalk.org/fusionbb/sh...5/post/968628/

[special-K]

Thanks. So, how can you tell? Like I said, the seller didn't know the year. If I knew the year that link provided that I already read in my search would have been helpful. In that thread it gives no info on how to determine how to tell one from the other. I also learned in my search, prior to posting this, about the differences internally. That's why I want the NV3500.

[ChevyTech]

Originally Posted by special-K

Thanks. So, how can you tell? Like I said, the seller didn't know the year. If I knew the year that link provided that I already read in my search would have been helpful. In that thread it gives no info on how to determine how to tell one from the other. I also learned in my search, prior to posting this, about the differences internally. That's why I want the NV3500.

They look different.

In your photos look the the passenger side on the transmission behind where the shifter is and notice the three cylindrical protrusions toward the rear and the detent cover with three humps in it. Those are for the shift rails.

You want a newer transmission with the single shift rail.

I have never seen a NV3500 in a case with the provision for multiple shift rails. If you want to be sure, remove the detent cover, and see if there are three springs to push down on three detent balls.

I did several searches for good photos and did not find what I wanted to show the differences.

Be careful because there is a lot of name inconsistency on these 5 speeds, even within GM literature.

I would get away from the name they are calling it and go with a 1994 or newer.

[special-K]

It's ridiculous that GM would use the same PN for different transmissions with different designs made by three different manufacturers. PNs are for identification, or used to be anyway. The seller is just calling it a 5spd from an 88-98 GM Truck. That's all he knows. He bought it already out of the truck, then decided to go with automatic. An NV3500 is exactly what I want. I'll pass on this, but I'd like to help the seller identify it. So are you sure it's the one mentioned or just that is isn't an NV3500 but is one of the other three with multiple shift rails? Thanks for pointing out the visual difference, makes sense. So now I can tell an NV3500 from the other three, but thoe you can only tell once you get into the case. Makes them hard to buy/sell since I can't go tearing into someone else's transmission before I buy it

[ChevyTech]

I am not sure of exactly what it is by the casting numbers on the case.

It is ridiculous, but my understanding is that a MG-290, HM-290, and 5LM60 all were built in the same case with the same casting numbers on the cases.

There was a first design and second design with different bearings and some other parts that were not interchangeable. The case was interchangeable. The second design came out during 1990. I am fairly sure that GM had already referred to it as a 5LM60 in 1989 when they were still the first design.

The only way I know determining if it is the first or the second design it to look at the input bearing.

In the 1993 C/K unit repair manual they are calling the multiple shift rail transmission a “NEW VENTURE GEAR 3500 (5LM60) MANUAL”. So now that you have GM putting the NV3500 name on the old multiple shift rail transmission.

The single shift rail design came out in 1993 but I don't think it was used in any vehicles before the 1994 model year. I am not sure on this either.

I am not surprised at the confusion because I think much of this comes from within GM. You have a company that reuses PRO codes, model names and other terminology.

[hatzie]

The NV3500 was released in 1993. Whether it was used in 1993 model year trucks...
It's more than a little miserable that the HM290, MG290, and 5LM60 all used the same case. They changed it for the NV3500.
The only way to really tell what it is... is to find a the Identification tag still on the bellhousing. The ID tag is paper on these transmissions.
There is a stamped serial number.
The NVG 5LM60 5-speed transmissions are numbered on the lower left side, about halfway back on the case.
The NVG 3500 5-speed transmissions are numbered on the top, left side of the case, near the bellhousing.

[special-K]

Thanks for the helpful additions you guys. We have gained more knowledge here as a better reference. I sent the guy selling the "GM Truck 5spd", who's pictures I used from Craigslist listing, a link to this thread whhen I got back to say it wasn't what I was looking for. He thanked me for that. It's all about helping one another out here. GM sure didn't do us any favors on this. Yeah right, paper ID tag . That really helped at the assembly line, but really only needed when transitioning from one to the next. The rest of the time they are all the same thing

[Theboatandcarman]

Ha! No way I just emailed about this one! Small world