so my diff its going out ds seal its gone and bearing its making noise so i figure time to upgrade i want posi and disk breaks now what gears should i look for 323 373? i dont want to over kill it but i want good highway speed since i drive highway 1 hr one way for work but i also want economy same reason now i have a 383 with a 1406 edelbrock and a t5 behind it thanks in advance

 

1hr? 3.45 max.

 

You're really gonna wake up that 383 with a 3.73 gear set. Do you want to upgrade the entire thing to something stronger, or keep it budget and rebuild the 10 bolt?

As far as a commuter car, i would say a 3.42 is the best of both worlds.

 

3.27 or 3.45 9 bolt.

The t 5 will probably break before the next rear end does.

 

yea im in mesa and just started working in casa grand so its more like 45 minutes once i hit the 10 and i dont really want to fix it ill rather upgrade to posi and disk breaks i have a 3.08 with drums non posi

 

so 3.42 to 3.45 should b good what about the 3.73 camaromike222 mentioned how will it affect the driveability will it be bad on city good highway or good city bad highway? thanks guys

 

Do you know what 5th gear you have? That will make a big difference on the highway. Most V8 T5s had .63 5th, but some of the high performance ones had .75

 

Thanks for asking I have no idea what it is and actually its off a v6 and I kno it won't last longbut my v8t5 broke and that was all I found at the time I want to eventually get a t56 in there but for now this one works

 

A V6 T5 is probably going to have .73. I would prefer the V8 box with .63 like you said.

I'm doing a bit over 20mi one-way with 3.73 gears and .67 OD. I would go 3.42 if I had your commute (and was going to keep it but I hope you have a good job or can shorten your commute some day )

 

k ill go with the 3.42 and yes it is a good job 17$ hr n hopefully in the future i can move closer but just signed a new lease so im screwed so far for now but thanks

 

i swapped in a rear from a v6 car.most of them are 3.42s.if you get one from a 1991-92 car a forth gen posi will bolt in.

 

I kno 4th gens bolt on but theyre wider n I already have wide tires as it is 295/50/15s

 

I also recommend the 3.42s

 

i was referring to a third gen rearend.i has one from a third gen v6 car before i swapped in the forth gen rear to match my vette wheels.the v6 rears are identical to the v8 rears but with better gearing.

 

Oh I see what ur saying my mistake

 

v8 t-5 cars got 9 bolts with 3.45 gears.

v8 autos with 9 bolts had 3.27 gears.

IMHO 3.27 would be great for your set up and needs.

9 bolts also have disc brakes, and are a little stronger then the 10 bolt by most accounts.

AFAIK all the 9 bolts in our cars were posi as well.

 

One more thing guys idk if it matters but like I mentioned I have 295/50R15s. Should it b taken in consideration when choosing the new dif?

 

they're about an inch taller than stock 16" third gen tire sizes. Yeah it's noticeable (if you were to go from one size to the other.)

It will slow down your engine a small amount compared to stock tires. But I still wouldn't go with 3.73 to compensate.

 

Ok does anybody knows where I can get a diff here in AZ for a reasonable price