84 Chevy 3/4 ton

[35 A]

Guys, I have an 84 Chevy 3/4 ton that I put together from several parts trucks. The truck was a factory 305 V8 with 700 -R 4 auto. Still has the original rear axle.It now has a 350 with a 4 speed out of my old 73 3/4 ton. I need an over drive gear for hiway driving. How much trouble would it be to install a 5 speed out a newer truck? Would I need to change the bell housing, clutch linkage, clutch disk, drive shaft, all of the above? Thanks in advance for your help.

 

[roger roland]

i think your truck has clutch linkage rods yet ? the newer ones would be hydrolic & i think if i remember right the hydrolics are on oppisite side but im sure there is something else out there u can try ?

 

[old]

Find your self an aux. tranny form an old twin stick big truck. Install it in place of the carrier bearing and then you would have the best of 2 worlds. 4th in those aux. trannys is an over dirve an 3rd is 1 to 1 and then you would also have 2 low gera so you would end up with 16 forward speeds. I've been thinking about doing that for years in a 1969 3/4 tone chev I have but just haven't found the time to do it yet. Plus I have 4 of those aux. trannys laying around any how so it would just be a matter of doing it
Hobby farm

 

[35 A]

Hobby farm! Thats the answer I've been looking for! There are some after market outfits that sell add on over drives but they are 2 grand or more per copy. I'll start looking around. Thank You!

 

[Allan in NE]

That's the nice thing about those old Chevys; just about everything will interchange.

I've got an old 1978 model, which has been totally converted to a '95 running gear/drivetrain.

Allan

 

[Dave H IA]

I bought a ranger 2 overdrive from Advanced Adapters and put it in front of the 4 speed in my 88 1 ton-- you can split gears and it drops the RPMs to 2300 at 65 MPH---about $1400 with my labor 1200 for the gear box and 200 to have the drive line shortened and balanced and new U joints

 

[Mike M]

Most will interchange,butttttt you also need to get the corresponding supports,brackets,drive shafts etc.etc. to get it all in there right.

 

[Anonymous-0]

I assume the cost has something to do with your decision.

Chevy used a four-speed manual transmissions with overdrive in half-ton and light 3/4 ton trucks 1981 - 1986. They show up fairly cheap. It's a New Process NP833 - Chevy RPO code MY6. Used parts catalogs usually show it as a "side cover" trans, and the HD four speed you have as the "top cover" trans.
It has a torque rating of 270 lb. ft., 1st gear - 3.09. 2nd gear - 1.67, 3rd gear - 1, and fourth OD - .73, and reverse - 3.

The later light-duty 5 speed - i.e. the NV3500 has an integral bellhousing and is rated for 300 lb. ft. of engine torque and a max. GVWR truck of 7200 lbs. Gear Ratio
1st 4.01
2nd 2.32
3rd 1.40
4th 1.00
5th 0.73

 

[Allan in NE]

I've only ever saw one of those side shift overdrive trannys.

It was in a '67 Impala that belonged to an IBM salesman. Darned thing seemed to work okay, but I sure wouldn't wanna use it for any actual "work" other than running up and down the highway. :>)

Allan

 

[Anonymous-0]

All of mine are in 1/2 ton 4WD trucks and I don't use any of them for heavy work. I wouldn't use a later NV3500 five speed either.

My 82 Chevy K10 has a 6.2 diesel, 4WD, 3.08 axles and the NP833 trans. It has 220,000 miles on it and still works fine. But again, this is a light duty truck. Nice thing about having the 833 in a 4WD is - the option of using the transfercase low-range for a lower first gear.

The trans looks similar to the muscle-car Muncie M21. It comes in two versions - aluminum or cast iron case. All the 833s in my Chevy trucks are cast-iron.

Chrysler - I think - was the first to use the 833 trans in some of their older Hemi powered muscle cars.

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[35 A]

I'm sure glad I learned to use a computer. There are so many great people out there willing to help a guy out. My kinda folks! As an old friend of mine used to say "fix it up, wear it out, make it do or do without" Thanks Again to everyone! Lewie

 

[old]

If you find one of those aux. trannys you should be ale to buy one for less then $500 way less then that because they are a thing f the past and no one uses them any more. Shoot in you where close enough to me I'd sell you one since I have 4 of them
Hobby farm

 

[Anonymous-0]

My friends dad, used to do those kind of modifications, long ago when we were young kids, auxillary trans in addition to all kinds of combinations of things in some of his old tow trucks, great guy and a good friend, retired now, but I still like to hear the stories, one of those people that was just a great all around mechanic, especially with heavy trucks, equipment, also did the lead body work and lettered many company trucks around here, he's got some real great artistic ability on top of all the rest.

Interesting scenario here, my K-10 snow plow truck has that heavy 4 spd and gear drive transfer case, changed er to a stick years ago too, was an auto, the truck may rust out beyond use, but that drivetrain won't be leaving here, it'll live in another one, so much easier to work on.