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Okay, You Smart Chevy Guys

A

Allan in NE

Well-known Member
Would ya call this a corporate 14-bolt 9.5 ('88 Chevy 2500)?

Somethin's really haywire with the tag in the glove box. It reads GT5, witch translates into a 4.10 ratio. Know that isn't right.

This thing runs down the hiway 17-1900 rpms at 65-70 mph. I'm thinkin' it feels like a 3:42; perhaps a 3:73.

Would really like to order the parts ahead of teardown, but 'spose I'm gonna have to open 'er up to get a tooth count.....bummer! :>(

Allan

23tac4.jpg
 
" smart Chevy guys "

Well I used to be a die hard Chevy guy. Then I got "smart" and don't buy anymore of there products ! So far so good. Alot less stuff to repair.
 
Allan,
There should be a code stamped somewhere on there that correctly identifies the axle and gear ratio. If memory serves, it's usually found on the right axle tube, stamped near the spring pad. You'll have to get your friendly Chevy parts guy to look it up for you.
By the way, did you remember to account for overdrive?
Good Luck and God Bless
 
(quoted from post at 10:30:05 11/07/11) Would ya call this a corporate 14-bolt 9.5 ('88 Chevy 2500)?

Somethin's really haywire with the tag in the glove box. It reads GT5, witch translates into a 4.10 ratio. Know that isn't right.

This thing runs down the hiway 17-1900 rpms at 65-70 mph. I'm thinkin' it feels like a 3:42; perhaps a 3:73.

Would really like to order the parts ahead of teardown, but 'spose I'm gonna have to open 'er up to get a tooth count.....bummer! :>(

Allan

<img src="http://i44.tinypic.com/23tac4.jpg">
Click to expand...
rand doesn't matter, if it isn't too broken, just put a mark on drive shaft & turn a wheel and count.
 
Yes on the corporate.You"re sure it didn"t say GT4(3:73)?

Ya know those glovebox liners do come out easy,so it might have gotten swapped.Watcha gotta replace Allan?
 
To get the ratio, if it isn't posi, jack up one wheel and turn it two rounds and count the turns of the driveshaft yolk, there's your ratio. Did they ever make a 3.42 in a 14 bolt?? I know there was a 3.73. I always thought they were bullet proof. I have one with full float axles in my bone pile, it's from a 76 though.
 
Oh, I oughtta be whipped with a big stick. :>(

But, I just can't stand it when machines aren't "right". It "irritates" me.

Gettin' a little 'gear whine' at around 35-45 mph. Just drives me nuts, so I'm gonna dance thru that third member.

Oh well, keeps me outta the pool hall, I guess. :>)

Allan
 
Yeah, thought of that.

Is that axle number the same as the "G" number you'd look for in the glove box? I was thinking that it was a different coding system?

Been too many years............

Allan
 
Naw,

The possessive adjective would be spelled "their" as opposed to the noun usage form spelled as "there", or even the contraction spelling “they’re”. :>)

Allan
 
alan, if ya peek in the rear end, check the adjusting nuts that set the back lash. we had a 3500 pickup in there that ate the ring and pinion. the threads in the housing on the left side adjuster were a little on the sloppy side, and it let the nut slip. check the backlash before ya pull the carrier and see if one side is a little too loose. if so check the adjusting nut threads. we ended up putting a used rear end in the truck as the case was shot.
 
Mike in MN has it right if it isn't a posi-trac. Jack up one side, mark it and the yoke. Two turns of the wheel and count the yolk turns. Easiest way I know of.
 
Allen, Nice catch on the there, their, they're.
We have all become too lax in our use of our official language.

There is an individual on the local Craig's list that is trying to sell their "Alison Chamber" tractor. They're willing to let it go for $750.

Hear in Kintucky lotsa folk is mad cause them furners caint speek proper inglish.
 
hey allen. if you get that axle code i can look it up in the parts dept. Yeah GT5 is 4.10, i think most the the 9.5's were GT4 3:73 RATIO, but you could have a factory 4:10 truck that a guy changed to 3:73. We still do that conversions yet on 2010 and 2011 (just cause sales don't want to find the rigth truck. dollan amount involved doesn't make sense to me!!) I m working on a 1996 6.5 K1500 today in the shop that has that "heavy half" rear-end. Rebuilding front differential.
 
Yes I had a 14 bolt 3:42 but it was a semi-floater, not a full float. It was in an 89' light duty 3/4 ton.
 
As long as you know what rear-end it is, the bearing kit should be the same for the standard carrier or the tall carrier, so unless you plan on ordering gears or a carrier I don`t see where the ratio matters. And the code on the axle could be looked up online or by anyone with a hollander book.
 
Thanks, I'd really appreciate it.

The stamped code on top of the right axle tube reads:

KHM G 1 871

Allan
 
Allen,

What size tires and transmission does the truck have? Any chance the speedometer is not reading accurately?
 
I've done a wee bit of "doctorin" in that department 'cause I put 265x16 tires/wheels on it and it has the 4L60 tranny.

Thing is tho, been workin' around Chevies since I was a pup. A 4:10 is a pretty darned DEEP ratio; I.E, fairly obvious. Heck, a 3:73 even seems a little steep to me. :>)

Anyay, it sure has a "3:42 feel" to it.

Allan
 
You won't know what you have until you take it apart. I found that the rear end in my '88 C-1500 was actually for an '87; they changed the design mid-year and the axle spline count is different. I don't know that the same is true of an '88 C-2500, but I wouldn't be surprised if it is.
 
I would bite the bullet and pull the cover,,, I am not sure if it has the same issue some fords have were the carrier eats into the housing on the left side and lets the carrier run loose... On fords they make a longer carrier are you can do a shad-tree fix... I get all my diff parts from Randy's Ring and pinion...

Good luck Diff work pays very well...
 
on the end of some pinions, there used to be tooth count numbers, I just don't remember what brand or size did that.
Tim in OR
 
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