I have 3.42 gearing with a 5 speed and want to go to 3.73's. Does anyone have 3.73 gearing with a 5 speed? Should I do this swap? Will it slow me down in the 1/4 mile? Reason why I ask is because I have the Desktop Dyno and Dragstrip software and according to it, I lose a couple tenths in the 1/4 mile if I went with 3.73's. Any advice will be appreciated.

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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

 

If anyone needs engine specifications to help with advice, it can be found here - https://www.thirdgen.org/rides/index...ew&rideid=4860


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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

 

I don't know the exact specs on your cam but personally I think 4.10 is what you want for the best 1/4 time. You really want to cross the 1/4 mark at your peak hp in 4th gear. Do some math and I think 4.10 will give you that

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, Jon (350 TBI!)
91 Red My website

 

I don't have a 5 speed but I cross at 98-99
at 14.1-14.2. I swapped the stock 3.23 with 3.73's and did not gain much mph but picked up nearly a half second et. I put in a take-out posi from a 4th gen too, my brother suggested I do that if I was going to change gears. From 3.42s to 3.73's isn't much of a change. 4.11's might give you some healthy traction problems on the launch and suck alot of gas around town but would be alot of fun. Probably get more bang for the buck just putting in a new posi.

 

Here are the specs for my camshaft. Maybe this will help. Keep in mind that I have 1.6 ratio roller rockers so actual lift is more.

Crane Camshaft Specification Card
Part Number: 104225
Grind Number: POWERMAX 2031 (FORMERLY COMPUCAM 2031)
Engine Ident: 1988-1989 CHEVROLET V-8 305 CU.IN.



VALVE SETTING: INTAKE .000 EXHAUST .000 ----> HOT

LIFT: INTAKE @CAM 292 @VALVE 438 ROCKER ARM RATIO
EXHAUST @CAM 301 @VALVE 452 1.50
ALL LIFTS ARE BASED ON ZERO LASH AND THEORETICAL ROCKER ARM RATIOS

CAM TIMING OPENS CLOSES ADV DURATION
@ --- INTAKE --- --- 264 °
-- LIFT EXHAUST --- --- 270 °

SPRING REQUIREMENTS
TRIPLE DUAL OUTER INNER
PART NUMBER 99848

LOADS:
CLOSED 105 LBS @ 1.700 OR 1 45/64
OPEN 265 LBS @ 1.280
RECOMMENDED RPM
RANGE WITH MATCHING COMPONENTS
MINIMUM RPM 1600
MAXIMUM RPM 5200
VALVE FLOAT 6500

CAM TIMING OPENS CLOSES MAX LIFT DURATION
@ .050 INTAKE (3)ATDC 31 ABDC 107 °ATDC 208 °
TAPPET LIFT EXHAUST 44 BBDC (10)BTDC 117 °BTDC 214 °

REMARKS:
AN ADJUSTABLE FUEL PRESSURE REGULATOR ( CRANE
P/N 99470-1 ) IS REQUIRED FOR USE WITH THIS
CAMSHAFT.




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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...ew&rideid=4860

[This message has been edited by pwdbychevy (edited August 29, 2001).]

 

If you can shift and you're running almost 100mph in the 1/4 with N2o, I would say go with teh 4.10 gears. You would cross the 1/4 mark at 5500 in 4th gear (1:1 ratio). The 3.73 is the best all around gear and probably better if you run on radials. Tire spin with the 4.10 gears might be pushing your cars limits near the end. If it were my car and I only cared about 1/4 mile time then 4.10 gears, if it was a daily driver then no more than 3.73 (even with a 6 speed).

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, Jon (350 TBI!)
91 Red My website