700r4 identification and some questions

[Jersyboyy]

Alrite fellas im nearing completion of the first stage of my drivetrain and I have a few simple quick questions that need answers.

First I got a 30 spline 700r4 off member named zero something or other but it has an electronic speedo tailhousing on it. Can I and if so how do I change tailshafts from my 27 spline cable driven speedo to the new 30 spline 700r4?

Next question. Ill be running et streets 265 40 18's in the back with a 342 4th gen rear end (for now soon will have 373s even when I upgrade to a 12bolt or 9" 373s will be in their) so what gear do I need to put in the tailhousing for the 342's or 373s with those tires so I can get the right speedo reading?

I have a non lockup 3200 stall now is this true, from my understanding by not connecting the 3(or 4 depending on tranny) prong connector on the driver side of the tranny closer to the front it will simply not lock up, and since im not using a lockup converter then just leave it un hooked would be fine right?

I have some pictures of the tranny if you guys could tell exactly what it is what the differences are between this and other year 700r4s chime in if not disregard them.

oh one last question did ls1 cars ever come with pbr brake calipers or did I get jibbed on my rear?

Btw what is that section in the first picture missing? Is that the detent cable stuff? Can I just swap over the detent stuff from my other tranny to this?

[Tru2Chevy]

You should be able to remove the electronic speed sensor and drop your cable driven one right in. As for gears, use this: http://www.tciauto.com/Products/TechInfo/speedo_gears.asp

If the converter you have is non-lockup, you don't need that square plug at all. Best bet is to cover it up so that it doesn't fill with crap so you can still use it easily if you swap a lockup converter in.

- Justin

[ar0ck]

Next question. Ill be running et streets 265 40 18's in the back with a 342 4th gen rear end

265? That's it? Stock 4th gen size is a 275/40/17, and a 40 height tire is pretty tall for an 18" wheel. Throwing a DR on an 18 kinda defeats the purpose, get normal tires, and run a spare set with appropriate size tires.

[Jersyboyy]

Alex on a third gen with c5 y2k wheels the widest tire you can use is 275(massaging the fender and cutting off the bumpstop) any bigger any you start getting into tubbing, and MT makes 265 or 295 no inbetween for an 18 from what iv seen.

If I go down to a wide 16" wheel I can easily run 295 maybe even 305s but I cant afford an extra set of wheels for the car just yet...a pair of 265 et streets will be fun until next season when a WHOLE new round of parts get ordered up.

[Jersyboyy]

Thanks justin I really couldnt figure that out it kept asking for either or the drive or driven gear...
I found this tho http://www.chevelles.com/shop/speedo.html using that im going with a 15 drive gear and 39 driven gear

[//<86TA>\\]

Alex on a third gen with c5 y2k wheels the widest tire you can use is 275(massaging the fender and cutting off the bumpstop) any bigger any you start getting into tubbing, and MT makes 265 or 295 no inbetween for an 18 from what iv seen.

If I go down to a wide 16" wheel I can easily run 295 maybe even 305s but I cant afford an extra set of wheels for the car just yet...a pair of 265 et streets will be fun until next season when a WHOLE new round of parts get ordered up.


with the right offset you can run a 315 on the back of a 3rd gen without anything close to tubbing teh car, maybe not on the y2k wheel, but its possible

[Jersyboyy]

with the right offset you can run a 315 on the back of a 3rd gen without anything close to tubbing teh car, maybe not on the y2k wheel, but its possible

yea not with 18's and a 2 inch drop def 17's and 16's with the correct offset tho.
And yea your right DEF not with y2ks iv been all through thirdgen and 275 is the widest with out heavy modification.