delete

thanks

 

My auto had 3.08's in it.

 

7.5" would be the carrier size, 10 bolt.

Gears should have been 2.73s on the auto and manual if its truely a Z28 model.

 

i have the 2.73 in my 82 firebird S/E 4bbl 305

 

ok, so 2.73

what trans was it originally

i wonder if it mattered in the 82 LG4 Z28's

or if all of them got teh same ratio regardless of trans

 

the car origanilly came with a th200c and its still in there

 

hehe thats what my 82 t/a was, my aunt had just bought a rebuilt 200c from a trans shop(out in casper wyoming where she lives and where i went to get the car)-
she bought the trans and then the original 305 blew up not long after that, heh

the car was gonna go to junkyard but i traveled all the way from here in IL to go and save its life and bring it here- a few summers ago now

and well thats the story behind that one, it wil never go anywhere, no sale, no trade no anythig, its permanent

i have since yanked the 200c and the dead 305 and put in a 6" tail th350 from a 77 G20 van i bought for 200 bucks and drove home and stripped, and used B&M tail mount bracket

works great , VERY easy swap, i highly recommend it for your 82

same driveshaft and tranny mount and all

 

So when i go to the junkyard which vehicles should i keep an eye out for that have the th350

 

the right length one ?

well any car will have the 6" tail th350

and any 69-72 2 wheel drive pickup/burb/blazer(2wd ones) also

and most 70s G-series(full size) vans too- but not ALL of them- some of these had the 9" tail th350 in them although way less common,

make sure you measure the tailshaft housing length, it will be 6" long

this is the one you want


any other vehicles than the above(mainly the 73-up 2 wheel drive trucks burbs blazers) will have the longer, 9" tail ones, its 3" longer than the 200c, so cant use it, unless you were replacing a 700r4

and some of the mid 70s b-body wagons had the th350 with the insanely long 12" tail
cant use that one either


get your B&M bracket for mounting the torque arm to the th350 tranny, and then its happy swapping because its a direct fit after that

 

i have been told to look for 2wd trucks, almost any of them should be a long tail if its a th350, which will drop in without replacing a tailshaft. If you get it out of a car chances are very high youll need to swap it to a long tailshaft.

 

no..... not for a 200c

you were told wrong

which happens all the time unfortunately,


a 200c is the length of a short 6" tail th350..... in which were not in the trucks 73-up


73-up truck one is what you would want for a 700r4 replacement

700r4= '73-up truck th350 length

tape measure and you will see, trust me..


there is 6" tail and there is 9" tail
these two are the most common ones and make up about 90 or 95% of all the 2wd th350 out there

9" = 700r4/4L60/4L60E

6"= 200c/250c/2004r

there is also an M38 3 speed auto which is basically a th350(similar to the 200C and 250) and are a metric version
but im unsure how many different tailshafts the M38 had,

and then there are the 375's which area a heavier 350(3 speed auto), also am unsure how many different tails they had


good luck

 

That's what it said on this site, my car should have had the 2.73's in it but when the cover was pulled, 3.08's were in there. Not sure if it was the stock rear but my car seemed to be bone stock, right down to the factory original exhaust.

 

the tech data on this site isnt very accurate for a few years. My car is a 82 Z 4 barrel auto and it has 3.23's verified with a build sheet.

non-g92 code, non-g80

regular gu5 code

my restoration kit lists

Not that the g80 and g92 RPO's would likely change these ratios

 

so this 82 z28 lg4 4 speed could very well be a 3.23 ?


thanks

 

Where'd you find the build sheet in the 82? Or did you send in for the info?

 

--------------------------------------------------------------------------------
Originally posted by blyth18md
the tech data on this site isnt very accurate for a few years. My car is a 82 Z 4 barrel auto and it has 3.23's verified with a build sheet.

non-g92 code, non-g80

regular gu5 code

my restoration kit lists



Not that the g80 and g92 RPO's would likely change these ratios
--------------------------------------------------------------------------------
After all of these years I'm no longer sure what rear end ratio my 82 has in it. I'm beginning to think that its not a 2.73, but maybe 3.23.

I'm saying this because when in the first year that I had my car, I got three speeding tickets. On the third speeding ticket, I had the car checked and they changed the speedometer gear in the transmission. The speedometer was 9 MPH off. The ticket was for 63 in a 55.

So If I go to the Calculation page and put in the following infromation 12.8 Radius, 2000 RPM, 3.23 Rear End Ratio and 1 for the Transmission Ratio, I get ~47 MPH, thats exactly what speedometer now says.

So I going to recheck my build sheet when I get home. Something is Rotten in Denmark!

 

ok you know what, lol

im gonna pull my diff cover today

haha


will get back to this thread with what i find

remember its an 82 Z28 LG4 4 speed car

old rusy original looking un touched 10 bolt still under it

i dunno if i could get stamping code off axle to though

but the ring gear will be date stamped along with stamping of tooth counts and part number of the ring gear

 

hey fast 68,thanks But what are the Gseries

 

Gs are the big old cube vans and motorhome chasis. not sure if they were used on anything else.

 

G= full size vans,
G10 G20 G30

1/2 ton 3/4 ton 1 ton

just like pickups blazers and burbs

a few small school buses and a few small RV's, and small cubes

anything that was G series chevy van body

heres a 1982 chevy G20 van converted to 4x4:




77 g-series classic cargo van:




77 chevy van advertisement:



93 g-10 van(see the 10 badge):



69 chevy G10 van:

 

Awsome fast68.Im gonna go to the junkyards now and get one.Thanks,your the man

 

Hi all,
I jsut check my build sheet, it says
GU2 273 Ratio Axl

 

just bring a tape measure, find you a 6" tail one, common as dirt



easy

 

my 82 camaro z28 came with the th200 tranny and 3.23 gears so not all 82s got 2.73.

 

Hi,
I just did a RPM vs MPH check on my car the other day. It does have the 3.23, so the new 4L60e transmission will be a good match after all. I can't explain why the car has the 3.23 because it was a base model Firebird with the LG4 and large front sway bar. The build sheet indicates 2.73. The car has the orginal ring and penion gears in it.

 

Hi All,
I have a copy of the MVMA Specification Form for the 1982 Pontiac Firebird dated 4-15-81 to 11-1-81. These are the specs used to build my 1982 Firebird. On page 2 of this document the Power Teams are spec out. For the Optional LG4 motor with Auto it lists 3.23 ratio. For the optional LU5 CFI engine it lists 2.93 for the auto and 3.23 for the manual transmission.

My Firebird was built on 12/23/1981. The interst date (which is the date that I told the dealer that I wanted the car) is 1/14/82. I took delivery on the 26th of Jan. 1982.

Unless some one else has a drifferent spec sheet, the technical data on this site as referance to the 1982 Firebird is therefore incorrect.