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Old 05-29-2007, 08:19 PM   #1 (permalink)
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gm 5 speed what tranny do i have????

i need to know what tranny i have i own a 96' GMC Jimmy 4x4 with a 4.3 vortech and a 5 speed manual trans.

i looked at the casing and all i saw were the numbers 20845 thats all, it has an internal slave cyl. and deep vented grooves in the casing. Problem is i dont know what the tranny is called and i need to buy one cause mine is knocking like hell.

Thanks BoB.
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Old 05-29-2007, 08:50 PM   #2 (permalink)
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Quote:
Originally Posted by bigbobs03tj View Post
i need to know what tranny i have i own a 96' GMC Jimmy 4x4 with a 4.3 vortech and a 5 speed manual trans.

i looked at the casing and all i saw were the numbers 20845 thats all, it has an internal slave cyl. and deep vented grooves in the casing. Problem is i dont know what the tranny is called and i need to buy one cause mine is knocking like hell.

Thanks BoB.

NV 3500?
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Old 05-29-2007, 10:18 PM   #3 (permalink)
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more than likely a borg warner T-5, very common in those trucks. Make sure you get one for the 4.3 as the 2.8 version will have smaller bearings and a different input shaft.
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Old 05-29-2007, 11:06 PM   #4 (permalink)
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NV3500.

T5's didn't get used behind anything bigger than 2.8L in S-trucks.
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Old 05-30-2007, 07:55 AM   #5 (permalink)
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they put T-5's in tune port V8 cars but not in 4.3 blazers? I am not saying you are wrong, but that seems kind of weird. Could we get a picture of this tranny you are looking for, that would help.
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Old 05-30-2007, 08:09 AM   #6 (permalink)
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they put T-5's in tune port V8 cars but not in 4.3 blazers?
That is correct.
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Old 05-30-2007, 09:27 AM   #7 (permalink)
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NV3500
no t-5's in 4.3's
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Old 05-30-2007, 09:28 AM   #8 (permalink)
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The transmissions are really easy to identify, The T-5 had a removable bellhousing.

The NV3500 transmissions are a two piece transmission but considered a non removable bellhousing. If you look at a NV3500, The bellhousing portion is smooth. It then forms into a lot of webbing right before the 2nd section of the transmission

The NV3500 is a decent transmission, The main reason we don't manufacture adapters for it is because of the non removable bellhousing. same for the
NV5600

1995-1996 was the cutting year

1995 2.2l 4cyl had T-5
1995 4.3 V6 had NV3500
(page 7b6-1 1995 GM S/T Truck Service Manual)

1996 2.2l 4cyl had NV1500 (also non removable, very light duty)
1996 4.3 v6 had NV3500
(page 7b7-1 1996 GM S/T Truck Service Manual)
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Old 05-30-2007, 05:34 PM   #9 (permalink)
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I checked the computer at work (mitchell) and it gave three options, like stated 2.8 only for the t-5 (my bad) and the nv3500 and the nv1500 for the 4.3. You learn something every day.
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Old 05-31-2007, 08:04 PM   #10 (permalink)
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Jimmy 5spd. tranny

Thanks guys, so it is a nv3500 correct??, 1996 4.3 vortech, 4x4, 5 spd. manual. i just want to make sure, cause i need to buy one like now...but i guess they are pretty hard to come across and pretty expensive as well cause i only found 2 tranny's and they both were about 800 bucks. W/core.

Does anyone know where i could pick one up for a decent price. This would save my day.

Thanks BoB
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Old 05-31-2007, 08:10 PM   #11 (permalink)
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www.car-part.com

Don't be surprised if you have to lay down the big coin.... the vast majority of that era S-truck with the 4.3L were autos.
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Old 06-01-2007, 02:37 PM   #12 (permalink)
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does the 4.3 and 2.8 have the same bolt pattern on the bell housing ?
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Old 06-01-2007, 02:59 PM   #13 (permalink)
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Old 06-02-2007, 10:47 AM   #14 (permalink)
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can u get a bellhousing for the t-5 that will fit the 4.3? Will the t-5 hold up to the 4.3
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Old 06-02-2007, 10:54 AM   #15 (permalink)
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easiest way would be to get a fs tranny and put it behing the 4.3 that motor and all the fs trucks have the same bellhousing and you might be able to get it cheaper.
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Old 06-02-2007, 10:55 AM   #16 (permalink)
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Would a T5 swap in place of a Saginaw 3 or 4spd? In that case, the 70s/80s car bellhousings should work.

The 2.8L T5 has an odd length input and spline. Some of the JTR material I read ages ago involved trimming the pilot snout down, trimming the bearing retainer collar, and mix-match a pressure plate and clutch disc.

This topic gets tossed around over on http://www.inliners.org/
The T5 is a popular swap for the old straight-6's.
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Old 06-02-2007, 11:12 AM   #17 (permalink)
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easiest way would be to get a fs tranny and put it behing the 4.3 that motor and all the fs trucks have the same bellhousing and you might be able to get it cheaper.
what are u calling fs truck?
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Old 06-02-2007, 12:48 PM   #18 (permalink)
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1500-3500
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Old 06-03-2007, 07:05 AM   #19 (permalink)
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nv-1500's were being 2.2 4-cylinders in s-10's. your truck is a 4.3 so it is a nv-3500 and they are fairly rare in 2wd's and almost never seen in 4x4's so expect to shell out some $$ for one.
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Old 06-03-2007, 02:04 PM   #20 (permalink)
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what would a 90 z71 with a 4.3 have in it?
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Old 06-03-2007, 02:40 PM   #21 (permalink)
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what would a 90 z71 with a 4.3 have in it?
Most likely the Getrag transmission the NV3500 is a copy of
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Old 06-03-2007, 03:16 PM   #22 (permalink)
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Most likely the Getrag transmission the NV3500 is a copy of
so is that a good thing?
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Old 06-03-2007, 03:29 PM   #23 (permalink)
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Not sure... I would tend to think the NV3500 is the newer, improved design.

It should be noted the FS 5-spds have a 6-bolt t-case pattern, but the S-series 5spds are 5-bolt at the t-case.
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