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?Rear End Ratio?

D

Ditchdigger

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Yo!
I have an 84 K-5 Blazer, TH-700R4 trans
I have the stock 10bolt with the
optional factory locker.
Does anybody know what my rear end gearing is?
by the way, I have no sticker and would rather not
pull the diff cover off.

84 Blazin Bowtie!
If you spin and Oriental,
Do they become Disoriented?
 
jack the rear of the truck up both tires off the ground and turn the tire one compleat turn and count how many times your driveline makes a compleat turn ie turns 3 and 3/4 turns =3:73's 4 and 1/4 turns 4:10's you get the idea
smile.gif


wheeling videoshttp://community.webshots.com/user/ssmith6333
 
how about an open diff?

1982 K10 Silverado.
cool.gif
327 SHPE powerplant SM465/205,15"custom lift 38.5"TSL/SWAMPERS 12boltrearD44 front,3.73 gears.
 
Whats your engine? Don't feel like looking for that link to the Blazer brochures, but at least for a few years, (80's sometime) a 305 equipped truck could ONLY get 3.08's or 3.73's, that was it. A 350 could ONLY get 3.08's or 3.42's.


Dorian
My tech/links page: <a target="_blank" href=http://www.dorianyeager.com/index2.html>www.dorianyeager.com/index2.html</a>
Why insist on counting when the ring gear has the tooth counts stamped in?
 
Its originally 305cid,
Was the TH-700R4 Standard??
I'm thinking its 3.73s but I'll try Mudhogs idea!

84 Blazin Bowtie!
If you spin and Oriental,
Do they become Disoriented?
 
Would be interesting to find out if factory trailering options on these trucks included the numerically higher gear ratio standard. 3 leaf front springs, 6 leaf rears and obviously a towing hitch would likely indicate the "towing package"

Dorian
My tech/links page: <a target="_blank" href=http://www.dorianyeager.com/index2.html>www.dorianyeager.com/index2.html</a>
Why insist on counting when the ring gear has the tooth counts stamped in?
 
I had an '85 K5 with a 305 and 700R4 with a nice stock receiver hitch that had 3.07 or 3.08 gearing. A real pig with 35s.

Stupid is as stupid does, I just try not to do anything stupid.
<a target="_blank" href=http://community.webshots.com/user/70gmc>http://community.webshots.com/user/70gmc</a>
 
Ok, in '84, gas trucks, manual transmission was standard. Diesel was the 4 speed auto (OD) ONLY.

Nothing is listed for axle ratios, but I'd figure my previous post about 3.42's for 350's and 3.73's only available with 305's to be accurate.

Those of you thinking 9:1 is the limit with 87 octane, the 305 in '84 was rated at 9.2:1, and thats with a "poor" combustion chamber, unlike the Vortecs.

Dorian
My tech/links page: <a target="_blank" href=http://www.dorianyeager.com/index2.html>www.dorianyeager.com/index2.html</a>
Why insist on counting when the ring gear has the tooth counts stamped in?
 
Well, there goes that theory. : ) Trailer hitch doesn't equal "better" gears apparently.

Dorian
My tech/links page: <a target="_blank" href=http://www.dorianyeager.com/index2.html>www.dorianyeager.com/index2.html</a>
Why insist on counting when the ring gear has the tooth counts stamped in?
 
My 85 had the trailering package. It is easy to tell (besides the sticker in the glove box) because of the wiring harness for electonic brake control above and beyond the typical trailer plug. Mine also had 3.73s with the 305. But, I don't hink that was part of the trailering package as it is listed as a seperate line item entry on the sticker. Mine also has the tranny cooler and oil cooler. Would the oil cooler also be an effect of the trailering packages?

Brian
Check out <a target="_blank" href=http://tx85gmcguy.alloffroad.com>My Jimmy</a> with all her projects!
 
can you put 4.10's or say 4.88's in a stock 10 bolt rear end and front end w/o changing the pumpkin? i can't afford lockers yet but want to turn 35's or 37's.

thanks

JJ85K5
 
I would assume it COULD be, but if anything, if thats a stock tranny cooler, THAT would be something I would think would certainly be part of a trailering package. Beginning to think GM didn't do much for a "trailering package" on these trucks, you had to piece it together yourself in a special order, or get lucky and find one on a lot that already had all that stuff.

If I were GM at that time, a K5 trailering package would have been the 350 or diesel, engine and tranny cooler (if auto trans) 3 leaf front, 6 leaf rear springs, trailering hitch and wiring, 3.73's, and 31 gallon tank. Those are all sensible options if you plan to tow, but I'm sure there was no option that covered all of that.

Dorian
My tech/links page: <a target="_blank" href=http://www.dorianyeager.com/index2.html>www.dorianyeager.com/index2.html</a>
Why insist on counting when the ring gear has the tooth counts stamped in?
 
i thought that the 350 came with 3:08's?? i hope so, i just bought a whole ft and rear with 3:73's thinking it would be an improvement!!!

Mud! Its cool!
 
3.08's were standard, 3.42's (in your case) were optional. Pays to check this stuff out BEFORE buying parts : )


Dorian
My tech/links page: <a target="_blank" href=http://www.dorianyeager.com/index2.html>www.dorianyeager.com/index2.html</a>
Why insist on counting when the ring gear has the tooth counts stamped in?
 
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