I have been surching the arcives and can't find the info that I am looking for. I am looking for what I need to do to my transmission to get the speedometer to read correctly. I have the 700R4 electric, I have seen part #'s for the mechanical gears, but have not seen part #'s for what I need. Can anyone help ? Again I have 3.42 gears with 235/60/15 tires (26.1" tall). Thanks.

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1990 RS Camaro 305 TBI 700R4 Tranny
3" cat back system with flowmaster muffler
Edelbrock strut brace tower and rear panhard bar
Spohn subframe conectors and lower control arms
all polyurithene bushing under the car
March underdrive pully system
K&N air filter
Hypertech chip
Aluminum driveshaft
3.42 posi rearend
Killer sound system
Many new mods to come

 

have you tried nextgenparts.com they have all sorts of speedometer adjusters for yout transmission. They should have what you need there

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1991 teal camaro RS rebuilt 96 350 marine motor, comp cam, accel ignition,8mm accel plugs and wires, flowtech headers, stock exhaust, and rear end. (2.73)

 

I was just wondering how you like the 3.42's. I want the same for my car and wanted to know what you thought. Did you go posi?

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1988 Camaro Sport Coupe: Orignally: 305 TBI 700r4
Now: 1974 350CI, 2bolt,.030 over, Badger Flat Head Pistons w/ valve relief, Melling high performance street cam, GM Cast Vortec Heads, Edelbrock RPM Air Gap Intake, Edelbrock 600cfm w/ electric choke, GM HEI w/ vacuum advance, Weiand Low Profile Air Cleaner, Mallory 5 port Fuel Pressure Regulator, Mr. Gasket Throttle Cable Bracket, Corvette Shift Servo, 16" IROC Wheels, Every thing else is STOCK
Soon: 3.73 or 3.42, Gears, Hoosier Q/T

 

See https://www.thirdgen.org/messgboard/...ML/004303.html

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82 Berlinetta, orig V-6 car, now w/86 LG4/TH700R4. 2.93 limited slip. Cat-back from '91 GTA, ZZ3 intake, Accel HEI SuperCoil. AMSOIL syn lubes bumper-to-bumper. Daily driver, work-in-progress (LG4 w/'87 LB9 block, ZZ3 cam, ported World 305 heads, Hooker headers & y-pipe, 3" Catco cat & 3" cat-back, Spohn SFCs).
57 Bel Air, my 1st car. '66 396, 9.7 CR forged TRWs, Weiand Action+, Edelbrock 1901 Q-Jet (Holley 3310 on the way), GK 270 cam, Magnum rockers, Jacobs Omnipack, 1-3/4" Hedders & 3" Warlocks, TH400 w/TCI Sat Night Special conv & Trans-Scat shift kit, MegaShifter, 3.08 8.2" 10-bolt w/Powertrax, AMSOIL syn lubes bumper-to-bumper. Idles smooth @ 600 RPM in D. Best 15.02/95.06 @ 5800' Bandimere (corrected 13.93/102.4 @ sea level).

 

15T Gray Drive (8642620)
41T Yellow Driven (25513048)

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1989 IROC-Z 5.7L
NOS 5151 150HP kit
ProBuilt 700R4, PI Vigilante 2800 stall lockup
Baer Brakes 12" Sport System

 

I got the zexel torsen from SLP, axels from drivetrain direct, and GM 3.42 gears. I like the gears (good allaround) they drive similar to the 2.73 around town(everyday driving) and when I decide to stomp the gas, they blow away those S*** 2.73 gears. I have not driven any great distance on the highway since the change, so I am not sure what difference their is in fuel mileage.