G87 Ring gear

[88Z51]

While deciphering the options on my '88, in addition to the (G44) 3.07 ratio, the sticker indicates a G87 8.5" diameter ring gear. Is this a heavy duty version or such? If so, what is the standard ring gear diameter for a 1988?

I appreciate any input.

Thanks,
Greg.

 

[Vettelt193]

I am pretty sure this is in direct relation to the different rear end. the 3.07 performance axle upgrades you to the Dana 44 rear, which is a much better unit. All you need to do if you want to order parts for your rear end is specify Dana 44 and they will know what you are talking about.

 

[rrubel]

He has a 4+3, so the Dana 44 and 8.5" ring gear are standard. Even if he'd had the auto, a 3.07 upgrade would still be a Dana 36 (which has, IIRC, a 7.87" diameter).
[RICHR]

 

[vader86]

8.5" ring gear is standard in D44 rear axle

which is standard in all manuals from 85 on

 

[88Z51]

Thanks. I do appreciate the answer(s)!
- I'm still learning about my new toy.....

Greg.

 

[89z51l98]

Hey Guys-

Mine is showing to be 3.33 ratio, and 8.5 inch ring gear... so from what you all have said, its a Dana 44...

My question is... will gears out of any Dana 44 (i'm looking to change ratios) work or do the gears have to be out of a Corvette rear??

Thanks!

 

[Ken]

Every C4 owner needs a ...

C-4 Cor-Vette Specs book by Michael Antonick. ​

[font=Arial, Helvetica, adobe-helvetica, Arial Narrow]AXLE:[/font]​

[font=Arial, Helvetica, adobe-helvetica, Arial Narrow]Type:[/font][font=Arial, Helvetica, adobe-helvetica, Arial Narrow] Rear[/font]​

[font=Arial, Helvetica, adobe-helvetica, Arial Narrow]Description:[/font][font=Arial, Helvetica, adobe-helvetica, Arial Narrow] Overhung pinion gear[/font]​

[font=Arial, Helvetica, adobe-helvetica, Arial Narrow]Limited slip differential type:[/font][font=Arial, Helvetica, adobe-helvetica, Arial Narrow] Standard, disc clutches[/font]​

[font=Arial, Helvetica, adobe-helvetica, Arial Narrow]Drive pinion offset:[/font][font=Arial, Helvetica, adobe-helvetica, Arial Narrow] 1.50" (8.5" ring gear), 1.125" (7.87" ring gear)[/font]​

[font=Arial, Helvetica, adobe-helvetica, Arial Narrow]Drive pinion type:[/font][font=Arial, Helvetica, adobe-helvetica, Arial Narrow] Hypoid[/font]​

[font=Arial, Helvetica, adobe-helvetica, Arial Narrow]Number of differential pinions:[/font][font=Arial, Helvetica, adobe-helvetica, Arial Narrow] 2[/font]​

[font=Arial, Helvetica, adobe-helvetica, Arial Narrow]Pinion/Differential bearing adjustment:[/font][font=Arial, Helvetica, adobe-helvetica, Arial Narrow] Shim[/font]​

[font=Arial, Helvetica, adobe-helvetica, Arial Narrow]Driving wheel bearing:[/font][font=Arial, Helvetica, adobe-helvetica, Arial Narrow] Tapered roller[/font]​

[font=Arial, Helvetica, adobe-helvetica, Arial Narrow]Lubricant capacity:[/font][font=Arial, Helvetica, adobe-helvetica, Arial Narrow] 3.75 pt [/font]​

[font=Arial, Helvetica, adobe-helvetica, Arial Narrow]Lubricant type recommended:[/font][font=Arial, Helvetica, adobe-helvetica, Arial Narrow] GL-5 gear lubricant [/font]​

[font=Arial, Helvetica, adobe-helvetica, Arial Narrow]Lubricant SAE viscosity:[/font][font=Arial, Helvetica, adobe-helvetica, Arial Narrow] 80W or 80W-90 summer, winter or extreme cold[/font]​

[font=Arial, Helvetica, adobe-helvetica, Arial Narrow]​

[/font]

[font=Arial, Helvetica, adobe-helvetica, Arial Narrow]AXLE RATIOS:[/font]​

[font=Arial, Helvetica, adobe-helvetica, Arial Narrow]2.59:1 ratio:[/font][font=Arial, Helvetica, adobe-helvetica, Arial Narrow] 17 pinion teeth, 44 ring teeth, 7.875" ring gear outside diameter[/font]​

[font=Arial, Helvetica, adobe-helvetica, Arial Narrow]2.73:1 ratio:[/font][font=Arial, Helvetica, adobe-helvetica, Arial Narrow] 15 pinion teeth, 41 ring teeth, 7.875" ring gear outside diameter[/font]​

[font=Arial, Helvetica, adobe-helvetica, Arial Narrow]3.07:1 ratio:[/font][font=Arial, Helvetica, adobe-helvetica, Arial Narrow] 14 pinion teeth, 43 ring teeth, 7.875" ring gear outside diameter[/font]​

[font=Arial, Helvetica, adobe-helvetica, Arial Narrow]3.07:1 ratio:[/font][font=Arial, Helvetica, adobe-helvetica, Arial Narrow] 14 pinion teeth, 43 ring teeth, 8.5" ring gear outside diameter (manual transmission)[/font]​

[font=Arial, Helvetica, adobe-helvetica, Arial Narrow]​

[/font]

[font=Arial, Helvetica, adobe-helvetica, Arial Narrow]PROPELLER SHAFT, REAR WHEEL DRIVE:[/font]​

[font=Arial, Helvetica, adobe-helvetica, Arial Narrow]Type: [/font][font=Arial, Helvetica, adobe-helvetica, Arial Narrow]Straight tube, internal-external damper[/font]​

[font=Arial, Helvetica, adobe-helvetica, Arial Narrow]Material:[/font][font=Arial, Helvetica, adobe-helvetica, Arial Narrow] Aluminum with manual transmission. Steel with automatic transmission except aluminum when automatic combined with RPO Z51 and RPO AG9 power seat[/font]​

[font=Arial, Helvetica, adobe-helvetica, Arial Narrow]Outer diameter:[/font][font=Arial, Helvetica, adobe-helvetica, Arial Narrow] 3.0" aluminum, 2.5" steel [/font]​

[font=Arial, Helvetica, adobe-helvetica, Arial Narrow]Length:[/font][font=Arial, Helvetica, adobe-helvetica, Arial Narrow] 31.7" manual, 32.5" automatic [/font]​

[font=Arial, Helvetica, adobe-helvetica, Arial Narrow]Wall thickness:[/font][font=Arial, Helvetica, adobe-helvetica, Arial Narrow] 0.12" aluminum, .065 steel [/font]​

[font=Arial, Helvetica, adobe-helvetica, Arial Narrow]Intermediate bearing type:[/font][font=Arial, Helvetica, adobe-helvetica, Arial Narrow] None [/font]​

[font=Arial, Helvetica, adobe-helvetica, Arial Narrow]Slip yoke type: [/font][font=Arial, Helvetica, adobe-helvetica, Arial Narrow]Splined yoke [/font]​

[font=Arial, Helvetica, adobe-helvetica, Arial Narrow]Slip yoke number of teeth:[/font][font=Arial, Helvetica, adobe-helvetica, Arial Narrow] 26 [/font]​

[font=Arial, Helvetica, adobe-helvetica, Arial Narrow]Slip yoke spline o.d.:[/font][font=Arial, Helvetica, adobe-helvetica, Arial Narrow] 1.17" [/font]​

[font=Arial, Helvetica, adobe-helvetica, Arial Narrow]Universal joints make & manufacturing number:[/font][font=Arial, Helvetica, adobe-helvetica, Arial Narrow] #1311 front, #1318 rear [/font]​

[font=Arial, Helvetica, adobe-helvetica, Arial Narrow]Universal joints used:[/font][font=Arial, Helvetica, adobe-helvetica, Arial Narrow] 2 [/font]​

[font=Arial, Helvetica, adobe-helvetica, Arial Narrow]Universal joints type:[/font][font=Arial, Helvetica, adobe-helvetica, Arial Narrow] Cross [/font]​

[font=Arial, Helvetica, adobe-helvetica, Arial Narrow]Universal joints rear attachment: [/font][font=Arial, Helvetica, adobe-helvetica, Arial Narrow]Strap and bolt [/font]​

[font=Arial, Helvetica, adobe-helvetica, Arial Narrow]Universal joints bearing type:[/font][font=Arial, Helvetica, adobe-helvetica, Arial Narrow] Anti-friction [/font]​

[font=Arial, Helvetica, adobe-helvetica, Arial Narrow]Universal joints lubrication:[/font][font=Arial, Helvetica, adobe-helvetica, Arial Narrow] Prepack [/font]​

[font=Arial, Helvetica, adobe-helvetica, Arial Narrow]Drive taken through:[/font][font=Arial, Helvetica, adobe-helvetica, Arial Narrow] Driveline beam [/font]​

[font=Arial, Helvetica, adobe-helvetica, Arial Narrow]Torque taken through:[/font][font=Arial, Helvetica, adobe-helvetica, Arial Narrow] Torque control arms[/font]​

 

[G Winter]

Another link to bookmark. Thanks Ken .

 

[Ken]

Just between you, me & the fencepost, the differences between a '90 and an '87 aren't that much, so if you're looking for some specifications in the future, you might find them on my page of specs: Corvette Obsession - Specs.

_ken

 

[WhalePirot]

With all yer mods, pal, how much in that book applies to your Vette?

 

[Ken]

[font=Arial, Helvetica, adobe-helvetica, Arial Narrow]ENGINE, GENERAL:[/font]​

[font=Arial, Helvetica, adobe-helvetica, Arial Narrow] Type and description:[/font][font=Arial, Helvetica, adobe-helvetica, Arial Narrow] 90° V, front, longitudinal[/font]​

[font=Arial, Helvetica, adobe-helvetica, Arial Narrow] Manufacturer:[/font][font=Arial, Helvetica, adobe-helvetica, Arial Narrow] Chevrolet[/font]​

[font=Arial, Helvetica, adobe-helvetica, Arial Narrow] Number of cylinders:[/font][font=Arial, Helvetica, adobe-helvetica, Arial Narrow] 8[/font]​