I'm looking into a '87 9 bolt rear out of a ws6 with posi and 3.27s. This is my only car so I still need mileage. currently I get 25 on the highway, (maybe I should but the old chip in for long trips) I turn about 2,100 rpms at 80. The 9 bolt should be a clean swap right?, just brake lines?, I shouldn't have to switch the valve should I?

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late model 91 rs, fully loaded, auto, t-tops, red leather, paint- gm red and yellow blend (light red), custom painted 16" Camaro rims
305 tbi flat base 14"x3" with K&N, hypertech chip, accel super stock plug wires, only use full synthetic oil and delco filter, 2 1/2" cat delete pipe, Edelbrock 3" cat-back
MTX sub and amp, Bose all around
vic_v8@yahoo.com
street kills: New v-6 stang, 96 v6 camaro, totally killed '86 SC Camaro (305), 91 z 28 with 305
15.854@87.57 (I think I could have it 15.5 with good tires and two more runs)
next month: rest of ultimate tbi

[This message has been edited by vicV8rs91 (edited October 30, 2001).]

 

Let's see:

2.73 will turn 2,730rpm's in the 1:1 gear at 70mph
3.23 will turn 3,230rpm's in the 1:1 gear at 70mph
3.27 will turn 3,270rpm's in the 1:1 gear at 70mph
3.42 will turn 3,420rpm's in the 1:1 gear at 70mph
3.73 will turn 3,730rpm's in the 1:1 gear at 70mph

See the trend? The 1:1 gear will be 3rd gear in an automatic and I think 4th gear in a 5-speed.

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86 Camaro Sport
LT1 Induction
383 Speed-O-Motive Crate Engine, Raptor 700R4 Tranmission, Trick Flow Twisted Wedge G2's, 58mm Accel TB, 3.73 Auburn Pro, SLP Cold Air Induction and Headers, Hooker Cat-back, Serpentine Belt Setup, Dual IROC Fans, Jamex springs, 16" IROC Rims, 36mm/24mm Sway Bars, Global West Steering Brace. Hotchkis Rear LCA's,Panhard Bar and SFC's.
My Camaro Project
Moderator at SE ThirdGen

[This message has been edited by John Millican (edited October 31, 2001).]

 

Multiply John's numbers by .70 and you will get your rpm in overdrive on the TH700R4.

 

thanks, I knew about the 3rd gear thing, but I wanted to know about od

 

That 3rd gear at 70 thing works fine, if you have a certain size tire. At 70 I run 3500 rpm with 3.73's in third gear. With the stock size tire 70 is at 3400 rpm with 3.73's in third gear. If you really want to be accurate check the link below:
http://www.f-body.org/gears/



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350 with stealth intake, holley carb, 470 lift cam. 700r4 with .5 boost valve, vette servo, tci lock-up kit, B&M megashifter. Richmond 3.73 gears, powertrax locker, timkin bearings, synthetic lube. Custom 3 inch single into 2 2.5 pipes. 1 1/2 drop springs, 1 5/16 solid front sway bar, 1 inch rear bar, custom subframe connectors, custom LCA relocation brackets. Kobel ground FX, currant red metallic paint. Lots of other stuff...
82camaro