Whats the best combo for a TBI 5-speed 3.23 or 3.42 I'm running 3.08 now.

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1991 Formula WS6
305 LO3 TBI 5-Speed 49,000 miles Dynomax Cat-Back,Hypertech Chip,etc..

 

I would go with the 3.42 I have the 3.73 with my 700R4 and love them I cruise at 2200 rpm at 65

Brian

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1989 Camaro RS

305 .030 over Hydro Pistons
Vortech heads milled to 58cc...Performer RPM intake....LT4 cam..Crane Gold rockers...FastChip custom chip...ALum. Driveshaft...3.73 gears with Posi...underdrive pullys...Rebuilt 700R4 with Vette Servo and B&M shift Kit...MSD ignition...A/C Delete No SMOG junk....1997 SS leather interior...B&M Shifter... Ultimate TBI mods...14X3 K&N open Element Non-Drop...Hooker headers....3" exhaust with Flowmaster Cross flow 16X8 Wheels from 97 RS Spohn LCA's Spohn Panhard Bar..LETS PLAY FORD!!

www.geocities.com/feltsb

 

Either one is better than what you have now. I put a 9-bolt with 3.45's in mine and am very happy with it. I had a 3.27 ratio 9-bolt in it while mine was being rebuilt. They both were fine. 3.23 or 3.27 are more plentiful. The only problem with the 3.23 or 3.27 ratio is a lack of spedo gears (GM never offered this rear end ratio for 5 speeds). So you will have to correct for the error. Since yours has a mechanical speedo cable it is easier. Speedo boxes are available aftermarket. Just drop in the correct gears. A speedo shop can set you up and verify the speedo is correct. Good luck, Lon.

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90 RS Convertible
Owner: Top-Down Solutions
(626)369-0040

http://www.sc3gfb.org/members/lonsal.html
http://www.taskerinc.com/gs3/profiles/Lon_profile.htm

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

 

I just finished installing 3.73 with my 5-speed and let me tell you that when you floor it your eyes will open up big time. I used to have the 3.42's and broke the pinion gear and decided to go for 3.73's. The overdrive will keep your gas mileage in check on the highway and they are awesome for the street. Keep in mind that these gears are only useful if your engine makes its power in the mid to upper rpm range.


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92' Camaro RS 305 TBI
Best 1/4 mile - 14.6 @ 96 mph w/NO NOS
Best 60' - 1.9 secs
Check it out
https://www.thirdgen.org/rides/index.tgo?action=view&rideid=4860

 

What ever you're doing...if you want speed you should tune so you cross the 1/4 mark at peak hp in either 3rd or 4th gear. That will give you the best 1/4 time 99% of the time.
So figure how fast you go in the 1/4 then figure what gear you CAN still hold and then figure out the rpm of the engine. Dada done
If I had a 5 speed I would go with the 3.73s or 4.10s just because you can! With an auto, anything more than 3.73 is overkill for the street. NJSpeeder will beg to differ but he's also running taller slicks at the track and needs the 4.10s.