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Looking to get the NV4500 in the 1994 K3500 rebuilt

J

jrsavoie

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Looking to get the NV4500 in the 1994 K3500 6.5 Turbo Diesel rebuilt

Does anybody know of a good rebuilder within a few hours of me that I can drop the truck off to and pick it back up in a decent period of time with the transmission repaired and properly installed.
I hate to pay people to do things & I'm usually not happy at the end, but I'm not able to do the job right now and I am getting in a crunch for time.

Or does anybody know of a GM GMC Chevy NV4500 5 speed manual transmission for a diesel 4x4 1993 to 2000 for sale?

I've missed several so far. But now this is a priority. It was before but for many reasons I could jump on the deals.

Any idea what it will cost to have the NV4500 rebuilt? The 3rd gear sincro seems to be out
 
I'll be looking and checking prices. I was hoping Mike would know of a great tranny shop close by. I need someplace I can get it in and out in a decent amount of time. I'm still going to put it off as long as possible - but that's no more than 3 weeks tops. More like 2 weeks
 
The NV4500 GM used changed significantly in '96 so you will want one from '92-'95, without a doubt, or you have to change several items. The later NV4500's have a different clutch slave & release bearing setup, integrated style riding on the input shaft, bolted to the aluminum input shaft bearing support. Not like your existing '94 model which has a cast iron bearing support and fork (traditional) style release bearing setup.

Now depending on who you listen to, the '92-'95 GM units will have the tall 1st/reverse - 6.34:1, while '96-up has 5.61:1, others will tell you that gearset change happened in '94. Beats me. I used to always think the former, but there's conflicting info out there now. Oh, and those claiming the gears changed in '94 also say that the earlier trans 1st/reverse are non-synchronized. Wouldn't know that either; oldest NV4500 I've had was a '94.

Richard
 
Richard, how I have heard (and so far it has held true) is 92-94 was 6.34 1st/reverse. 95 brought 5.61 1st/reverse, and the new top cover with shifter stub. 96 brought the internal slave and shared bellhousing to tranny bolt pattern w/ dodge. 97 brought a reverse gear change, in both design and ratio (5.04) so that makes 96 the only year of the new style that can accept 6.34 gears.

99 brought synchronized reverse

I assume GMT800 brought a slightly different, but comparable top cover.

richard, in the ones you/ve played with, would you say if one has a 92-94 NV4500 out it would be a good idea to upgrade top covers? IMO, the 92-94 always feel scratchy.

Jeff, did you get the craigslist one bought?
 
I am leaving to get it as soon as I get done feeding my face.

How do you check to see if it has the damper? & what do you have to do if it doesn't?

How much does the damper cost?

GM Guy said:
Richard, how I have heard (and so far it has held true) is 92-94 was 6.34 1st/reverse. 95 brought 5.61 1st/reverse, and the new top cover with shifter stub. 96 brought the internal slave and shared bellhousing to tranny bolt pattern w/ dodge. 97 brought a reverse gear change, in both design and ratio (5.04) so that makes 96 the only year of the new style that can accept 6.34 gears.

99 brought synchronized reverse

I assume GMT800 brought a slightly different, but comparable top cover.

richard, in the ones you/ve played with, would you say if one has a 92-94 NV4500 out it would be a good idea to upgrade top covers? IMO, the 92-94 always feel scratchy.

Jeff, did you get the craigslist one bought?
Click to expand...
 
GM Guy - I hadn't heard about that third revision of the gearset; your mention of it is first I've seen. I used to refer to nv4500.com's info but it looks like that site has been superceded by a different company now and the tech info is gone? The stuff on wikipedia doesn't necessarily match what I've come to believe either. Now I'm really confused. :)

Funny what you said about the '96 though as it was the '96 case and integrated slave/release bearing setup I used with the '94 guts, in my black 3500HD, worked like a champ.

I personally didn't see any difference in the top cover between my '94 NV4500 from the 3500HD, and the '96 NV4500 from a 3500...what was the change? And come to think of it, the one I pulled from a '98 2500 appeared the same as the '96 model, though I didn't do an in-depth comparison for any reason.

Richard
 
Richard,
the top covers afaik are the integrated shifter, and the ones with the 4 bolt flange that you can remove the shifter stub. yours may have been upgraded already, since you never noticed a change.

quad4x4 is where I get my info. also a great place to see all the different parts from different years.

very glad to hear of someone doing what I was wondering could be done, the 6.34 gears in a 96 case. according to info I found it was possible, but now it is a sure thing!


Jeff, the damper is just a nice thing to have for longevity. since you are a longevity type of guy, I am sure you want one. brandis4x4perfromance (ebay user name) has 1 for around 100 bucks. quad4x4 has a few for 350-400 IIRC. cant really tell w/o pulling the rear cover off afaik, but the 4x4 tailshaft housing might have enough gap one might be able to see it.

good luck!
 
Trying to post a picture that may show the damper. Is it the big round thing on the tail shaft?

Couldn't get the pic to post. I'll try to email it.

I'm 98% CERTAIN THAT THIS TRANS HAS THE DAMPER
 
The shifters & tops of the transmissions are different.

What do I need to do and what parts do I need to make the trans I bought work They are both 10 spline in and 32 spline out.
The old one is pictured in the truck is kind of square and the new used one is on the bench and looks like it would take a round boot.

Do I just need some sort of rubber cap? & a clamp or something?

Part numbers? Where to buy?
NV4500 shifter 003.jpgNV4500 shifter 004.jpgNV4500 shifter 005.jpgNV4500 shifter 006.jpgNV4500 shifter 003.jpgNV4500 shifter 004.jpgNV4500 shifter 005.jpgNV4500 shifter 006.jpg
 
What part is in question? The round one is what my 93 & 94 have. There should be a rubber dust boot on the top.

IIRC the square removable top hat is a 95 and newer style, the 95 had a removable top and low gears. You must have a LATE 94 or the tranny has been swapped.

EDIT: Just say your shift lever post, looks like your tranny has been swapped. 95 has a different shift lever. Not sure if the levers were inerchangable
 
I talked to a rebuilder today that said both types of trans were used in the 94

I would like a part number or a link to the rubber dust boot. We will find out tomorrow if the bolt centers are correct for the bell housing
 
Fair enough, I've just never seen that style in any of the 94's I've looked in. There is a round dust boot/ fume blocker that goes on top of the shift tower and fits in the ring groove around the top. My boot is ripped and I just cut a dust cover out of an old combine draper belt. My old 89 with the granny 4 was repaired the same way lol.
 
I checked on the boot for the 95s, and it was discontinued, so I imagine the 94 and earlier is discontinued as well. quad4x4 or blumenthals may have one.

I am with tanner, never saw a 94 with the removeable stub, but it could exist.

quad4x4 is up and running again, so for fun run your VIN (on a comp near a printer, as IIRC they only give limited free checks) and see the build date and give the RPO code. I think MW3 was the 5.61 gears and the MT(or W??) 8 (IIRC) was the 6.34 gears.

good luck!
 
Never thought to ask Blumenthals for the boot. I can get you their #, or if you get it ask for Mary.

The boot was discontinued 7yrs ago atleast for 94 and older. We learned the old inner tube or combine draper trick on Ol' Blue.

Easy way to check gear ratio would just be to see if the casting # on the case is 95 or 96. IIRC removable stub and external slave cyliner is low gear 95 (or possibly 94 it seems). 96 went to internal slave and removable stub with high gears. THEN AGAIN GM did what ever they felt like using mix match parts as we all know.
 
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