hey all i have a 88 trans am with 305 700r4 tranny BUT i have 4.56 posi rear and all the gears in the tranny are stock !! anyone know of a place i could get the right gears so i can drive my car so i know how fast im going???
thanks for any posts

 

why would you want 4.56 gears with a tpi and a 700r4? you're gonna run out before you go anywhere.

 

LOL thats the way i got the car when i bought it dont really wanna change it.... but id tell ya its FAST....... but believe it or not i get good gas mileage

i drove it with full tank of gas to my town and back which is prolly a good 3 mile drive... did it there and back 3-4 times and only took 1/4 - 1/2 tank gas which i couldnt believe it LOL

 

lol....i didn't mean gas i was referring to running out of power. the tpi's make the power and torque relatively low in the rpm range(less than 4500rpm) with at best a 3.42 from the factory. i've heard of gus running 3.73's but i would imagine te motor is running out of breath too soon.

 

oh well i dunno man but its not like im racing the car its just going to be a good weather driving car and thats it so probably going to only take it out when its sunny lol thats only time

 

that's cool just hate to think about the rpms cruising around town....lol

as far as the speedo goes, there are several companies that make adapters for such things. i don't believe there are factory speedo gears to make your speedo accurate.

 

some info..

https://www.thirdgen.org/forums/tran...4+speedo+gears

 

why thank you johnny hey john u going to any shows this spring?
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actually rpms arent a problem fairly low doesnt lose too much power

 

I hope to have the car out by may or so. Still gotta run some new fuel lines and finalize everything else with the T56 and LT Header swap and she is a runner again!

 

hey you should come over sometime and help me get my car runnin lol

 

4.56 with a 700r4? That would be about 2900rpm @ 70mph in OD. A TPI car would peak by 125mph. It would move out of the hole, but would basically get beat by 4.3 S10's from 45+mph. - I'd look more into changing the rear end gears back to something that makes sense, if that's actually whats in it. - If not for the sake of performance and mileage, for the sake of the 10-bolt. Anything lower than a 3.73 is asking for breakage in a 7.5 10-bolt.

 

in a way u do have a point lol well yes 4.56 is ACTUALLY whats in it cuz me and a friend rotated the tires 1 complete turn and counted 4 and a half rotates on the driveshaft.....but in anywho do you know what a 88 305 tpi with 700r4 ran stock with?? then i wouldnt have to worry about changing the speedo gears in the tranny LOL

 

https://www.thirdgen.org/1988-chevy-camaro

 

i see but how do u know if your car came with 2.73 or 3.23 stock??? i bought my trans am with 4.56 rear but no idea what stock came with... because my speedo is almost 20 mph off

 

Try to find you RPO codes and post them. We can tell you what it came with stock. Or you can pull the stamped code off of you rear on the passenger side axel tube around the pumpkin. You may have to take a wire brush to it in that area to see it though. That would be something we could cross too.