Manual trans identification

markaria

Not-quite-so-new-guy
Dec 6, 2021
11
3
I am going to look at a possibly good lt1 engine/trans buy tomorrow that the seller got as a package deal and doesnt know what the trans is other than he says it's a 6 speed ...it is attached to a lt1 v8. My first thought is t56 woohoo...but looking at pics it dont look like any t56 I've ever seen. Heres a couple pics I zoomed in on from his pics and hoping someone on here may shed some light on what transmission this is...thanks for any and all insight!
 

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ELCAM

G-Body Guru
Jun 19, 2021
521
93
Looks a lot like a NV3500 or Getrag HM290 5 speed out of a C 1500 2 wheel drive pickup circa 2000.
 
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oldsmobile joe

Royal Smart Person
Nov 12, 2015
2,003
113
mpls
Looks a lot like a NV3500 or Getrag HM290 5 speed out of a C 1500 2 wheel drive pickup circa 2000.
I agree. I think s10 pick ups with a 4.3l may have come with the nv3500 also. The hyd slave was mounted in a different position though compared to the full size 1500.
 

markaria

Not-quite-so-new-guy
Thread starter
Dec 6, 2021
11
3
Thanks guys...what threw me for a loop is seller was saying all he knew was it is a 6 speed...lol but I suppose if you include reverse it is haha (was really hoping I just found the best deal ever on a t56...but not) guys asking 600 for the lt1 with this transmission which may still be a good deal but I havent the need for it
 

oldsmobile joe

Royal Smart Person
Nov 12, 2015
2,003
113
mpls
The nv3500 is a decent trans. The issue is the shifter comes thru the floor under the radio.
 
Oct 14, 2008
8,129
113
Melville,Saskatchewan
Make sure it is the close ratio version. Both versions have a .73 OD gear. I would not go too deep on rear gears with that OD and a 3.5 to 1 first gear. The best version was in the Dodge Dakota behind the 5.2 Magnum and the 2000+ 3.9 V6. It was rated at 330 ft/lbs of torque, the GM version is 300 ft/lbs. I believe the Dodge had upgraded synchros. Dodge never put a 5.9 in front of it. Many have, even modified ones and they lived. If you drive like a maniac, the LT1's torque will probably destroy it. The LT1's torque was enough to kill the 4L60E factory, saw it myself. I that guess doesn't say much, it was a stock 4L60E😋.
 
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Wageslave

Royal Smart Person
Jan 25, 2017
1,550
113
Make sure it is the close ratio version. Both versions have a .73 OD gear. I would not go too deep on rear gears with that OD and a 3.5 to 1 first gear. The best version was in the Dodge Dakota behind the 5.2 Magnum and the 2000+ 3.9 V6. It was rated at 330 ft/lbs of torque, the GM version is 300 ft/lbs. I believe the Dodge had upgraded synchros. Dodge never put a 5.9 in front of it. Many have, even modified ones and they lived. If you drive like a maniac, the LT1's torque will probably destroy it. The LT1's torque was enough to kill the 4L60E factory, saw it myself. I that guess doesn't say much, it was a stock 4L60E😋.
The bellhousings aren't switchable on the NV's, so you are stuck with the two Chevrolet versions. The full-size version puts the shifter under the radio. The S-10 version puts it back about 2-3 inches behind the front of the radio. Both have electronic speed sensors only and have no provisions for a mechanical clutch.

That being said, that looks more like the HM290, than an NV3500. I would pass on it for a G-Body application.
 
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markaria

Not-quite-so-new-guy
Thread starter
Dec 6, 2021
11
3
The nv3500 is a decent trans. The issue is the shifter comes thru the floor under the radio.
Yea thanks...I already have a t5 in the car...if I'm gonna take the t5 out it will be for a t56... I was hoping I found a great deal on a t56 but I was wrong :)
 

Built6spdMCSS

Royal Smart Person
Jun 15, 2012
1,129
113
I ended up with a 1993 LT1 T56 that from the looks of it can only be used for LT1 or SBC unless I do a bunch of stuff to convert it to LS setup, I'm kind of on the other end of that pain.
 
Oct 14, 2008
8,129
113
Melville,Saskatchewan
The bellhousings aren't switchable on the NV's, so you are stuck with the two Chevrolet versions. The full-size version puts the shifter under the radio. The S-10 version puts it back about 2-3 inches behind the front of the radio. Both have electronic speed sensors only and have no provisions for a mechanical clutch.

That being said, that looks more like the HM290, than an NV3500. I would pass on it for a G-Body application.
Good point on the bell housing, exactly why I haven't considered one and eliminates trucks for my Olds swap plans. I wasn't suggesting the Dodge version anyways, only marginally better. A lot of the online stuff basically lumps the HM290 the same as the NV3500. I assume they are a totally different trans or is it an earlier version as the web says?
 
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