3.42's with 7.5 no posi or slip

[youngdeezy510]

1983 cutlass with lt1 350 and th350 combo with 3.42's 7.5 open rearend what would my top mph be. I have no concern driving over 85 mph but I would like to have a idea of what this setup will do for highway driving. if i had 3.73's i know my highway top speed would be real low. i just wanna make sure im not gonna top out at 68 mph or something like that.

i dont have the 3.42s yet its still stock 2.29 i think. the car was a 6 banger 3.8 before

 

[SSedan64]

A MPH Calculator from RPM and Gearing

Input your Info into 2nd calculator.
A MPH Calculator from RPM and Gearing
Acceleration Calculators

 

[overkillphil]

With that engine, why not move up to an 8.5 out of a T-Buick? I can't see spending alot of money on a 7.5" rear, IMHO.

 

[SSedan64]

With that engine, why not move up to an 8.5 out of a T-Buick? I can't see spending alot of money on a 7.5" rear, IMHO.

I agree, it's like polishing a turd.:biggrin:
With good traction that 7.5" wont last long.

 

[youngdeezy510]

Well this thread I posted does not matter any more because sat I was able to get myself an 8.5 non posi Axel from an 85 442 with 3.73's for $500 craigslist. Since then I started lookin for posi units from auburn or eaton so this is my next move. Then I can swap that old 7.5 out

 

[SSedan64]

Now you you have something to work with.
You can find the TractionLock Posi's for sale on here every now & then. Don't get an Auburn, they're not rebuildable and run from the Gov Lock Diff.
If you buy new get a Eaton Posi, Detroit TrueTrac etc..

Different type Diff Pics>> rear end parts pictures from cars photos on webshots

 

[youngdeezy510]

Thanks for that info 64. Most likely it will be a eaton unit. Anyway bro check me out sometime I don't post to often around but I always get the correct info when I do! www.cardomain.com/ride/2540200 now I'm about to checkout the link for pics you posted

 

[youngdeezy510]

I found this eaton posi on eBay for $444 is this the route I should be goin?
GM 8.5" 10 BOLT EATON 28 SPLINE POSI CHEVY CAMARO 19557 : eBay Motors (item 370222927403 end time Feb-25-10 15:42:37 PST)

 

[SSedan64]

I've had good luck with Complete Offroad. They have Free S/H & meet or beat others prices. Send them a Email or call for best price.
Gears, Lockers and Install Kits - G.M. 8.5" and 8.6" CORPORATE 10 BOLT - G.M. 10 BOLT LOCKERS AND CARRIERS

Gears, Lockers and Install Kits - G.M. 8.5" and 8.6" CORPORATE 10 BOLT - G.M. 10 BOLT INSTALL KITS

If you plan on new axles, you can get a 30-Spline Posi Carrier and 30-Spline axles for more strength. Stock is 28-Spline. The Yukon DuraGrip Posi can be found cheaper than Eaton sometimes also. A Solid Pinion Spacer will add strength also, stock uses Crush Sleeve for Pinion bearing preload.
It does pay to shop around & see what price the different Co.'s will meet/beat. Many of them have ebay stores with better prices.

http://www.tomsdifferentials.com/
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Randy's Ring & Pinion. The Differential Experts. Auto Parts & Services.
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